Yamaha WR450F(R) Owner's Service Manual

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OWNER'S SERVICE MANUAL
WR450FR
LIT-11626-16-43
5TJ-28199-10

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  • Page 1 OWNER’S SERVICE MANUAL WR450FR LIT-11626-16-43 5TJ-28199-10...
  • Page 3 EC010000 WR450FR OWNER’S SERVICE MANUAL ©2002 by Yamaha Motor Corporation, U.S.A. 1st Edition, October 2002 All rights reserved. Any reprinting or unauthorized use without the written permission of Yamaha Motor Corporation U.S.A. is expressly prohibited. Printed in Japan P/N. LIT-11626-16-43...
  • Page 4 EC020000 INTRODUCTION Congratulations on your purchase of a Yamaha WR series. This model is the culmina- tion of Yamaha’s vast experience in the pro- duction of pacesetting racing machines. It represents the highest grade of craftsmanship and reliability that have made Yamaha a leader.
  • Page 6: Important Notice

    IMPORTANT NOTICE THIS MACHINE IS DESIGNED STRICTLY FOR COMPETITION USE, ONLY ON A CLOSED COURSE. It is illegal for this machine to be operated on any public street, road, or highway. Off-road use on public lands may also be illegal. Please check local regula- tions before riding.
  • Page 7 6. GASOLINE CAN CAUSE INJURY. If you should swallow some gasoline, inhale excess gasoline vapors, or allow any gasoline to get into your eyes, contact a doctor immediately. If any gasoline spills onto your skin or clothing, immediately wash skin areas with soap and water, and change your clothes.
  • Page 8 If you have any questions regarding the operation or maintenance of your machine, please consult your Yamaha dealer. NOTE: This manual should be considered a perma- nent part of this machine and should remain with it even if the machine is subsequently sold.
  • Page 9 EC080000 HOW TO USE THIS MANUAL EC081000 PARTICULARLY IMPORTANT INFORMATION The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR SAFETY INVOLVED! WARNING Failure to follow WARNING instructions could result in severe injury or death to the machine operator, a bystander, or a person inspecting or repairing the machine.
  • Page 10 EC083000 MANUAL FORMAT All of the procedures in this manual are organized in a sequential, step-by-step format. The informa- tion has been complied to provide the mechanic with an easy to read, handy reference that contains comprehensive explanations of all disassembly, repair, assembly, and inspection operations. In this revised format, the condition of a faulty component will precede an arrow symbol and the course of action required will follow the symbol, e.g., Bearings...
  • Page 11 ILLUSTRATED SYMBOLS (Refer to the illustration) SPEC Illustrated symbols 1 to 7 are designed as INFO thumb tabs to indicate the chapter’s number and content. 1 General information INSP 2 Specifications 3 Regular inspection and adjustments 4 Engine 5 Chassis 6 Electrical –...
  • Page 12 MEMO...
  • Page 13 EC090000 INDEX GENERAL INFORMATION INFO SPECIFICATIONS SPEC REGULAR INSPECTION AND INSP ADJUSTMENTS ENGINE CHASSIS CHAS – ELECTRICAL ELEC TUNING...
  • Page 14: Table Of Contents

    EC0A0000 CONTENTS CHAPTER 1 GENERAL INFORMATION DESCRIPTION .......... 1-1 MACHINE IDENTIFICATION ....1-2 IMPORTANT INFORMATION ....1-3 CHECKING OF CONNECTION ....1-6 SPECIAL TOOLS ........1-7 CONTROL FUNCTIONS ......1-10 FUEL ............1-14 STARTING AND BREAK-IN ....1-15 TORQUE-CHECK POINTS ..... 1-19 CLEANING AND STORAGE ....
  • Page 15 CHAPTER 4 ENGINE SEAT, FUEL TANK AND SIDE COVERS ......... 4-1 EXHAUST PIPE AND SILENCER .... 4-3 RADIATOR ..........4-5 CARBURETOR ......... 4-8 CAMSHAFTS .......... 4-21 CYLINDER HEAD ........4-29 VALVES AND VALVE SPRINGS ... 4-33 CYLINDER AND PISTON ....... 4-42 CLUTCH ..........
  • Page 16 CHAPTER 6 ELECTRICAL ELECTRICAL COMPONENTS AND WIRING DIAGRAM ......6-1 MAP-CONTROLLED CDI UNIT ....6-2 IGNITION SYSTEM ........6-3 ELECTRIC STARTING SYSTEM ....6-7 CHARGING SYSTEM ......6-17 TPS (THROTTLE POSITION SENSOR) SYSTEM ..........6-19 LIGHTING SYSTEM ........ 6-24 CHAPTER 7 TUNING ENGINE .............
  • Page 17: General Information

    DESCRIPTION INFO EC100000 GENERAL INFORMATION EC110000 DESCRIPTION NOTE: 1 Clutch lever The machine you have purchased may differ 2 Hot starter lever slightly from those shown in the following. 3 “ENGINE STOP” button Designs and specifications are subject to 4 Trip meter change without notice.
  • Page 18: Machine Identification

    There are two significant reasons for knowing the serial number of your machine: 1. When ordering parts, you can give the number to your Yamaha dealer for posi- tive identification of the model you own. 2. If your machine is stolen, the authorities will need the number to search for and identify your machine.
  • Page 19: Important Information

    IMPORTANT INFORMATION INFO EC130000 IMPORTANT INFORMATION EC131010 PREPARATION FOR REMOVAL AND DISASSEMBLY 1. Remove all dirt, mud, dust, and foreign material before removal and disassem- bly. When washing the machine with high pressured water, cover the parts as fol- lows. Silencer exhaust port Side cover air intake port Water pump housing hole at the bottom...
  • Page 20 IMPORTANT INFORMATION INFO EC132000 ALL REPLACEMENT PARTS 1. We recommend to use Yamaha genuine parts for all replacements. Use oil and/or grease recommended by Yamaha for assembly and adjustment. EC133000 GASKETS, OIL SEALS AND O-RINGS 1. All gaskets, oil seals, and O-rings should be replaced when an engine is over- hauled.
  • Page 21 IMPORTANT INFORMATION INFO EC136000 CIRCLIPS 1. All circlips should be inspected carefully before reassembly. Always replace pis- ton pin clips after one use. Replace dis- torted circlips. When installing a circlip 1, make sure that the sharp-edged cor- ner 2 is positioned opposite to the thrust 3 it receives.
  • Page 22: Checking Of Connection

    CHECKING OF CONNECTION INFO EC1C0001 CHECKING OF CONNECTION Dealing with stains, rust, moisture, etc. on the connector. 1. Disconnect: Connector 2. Dry each terminal with an air blower. 3. Connect and disconnect the connector two or three times. 4. Pull the lead to check that it will not come off.
  • Page 23: Special Tools

    SPECIAL TOOLS INFO EC140001 SPECIAL TOOLS The proper special tools are necessary for complete and accurate tune-up and assembly. Using the correct special tool will help prevent damage caused by the use of improper tools or improvised techniques. The shape and part number used for the special tool differ by country, so two types are provided.
  • Page 24 Illustration YM-01442, 90890-01442 Fork seal driver YM-01442 90890-01442 This tool is used when install the fork oil seal. YU-3112-C, 90890-03112 Yamaha pocket tester YU-3112-C 90890-03112 Use this tool to inspect the coil resistance, output voltage and amperage. YU-8036-B Inductive tachometer...
  • Page 25 Dynamic spark tester YM-34487 90890-06754 90890-06754 Ignition checker This instrument is necessary for checking the ignition system components.  ACC-QUICK-GS-KT Quick gasket ACC-QUICK-GS-KT 90890-85505 90890-85505 YAMAHA Bond No. 1215 This sealant (Bond) is used for crankcase mating surface, etc. 1 - 9...
  • Page 26: Control Functions

    CONTROL FUNCTIONS INFO EC150000 CONTROL FUNCTIONS MAIN SWITCH Functions of the respective switch positions are as follows: The engine can be started only at this position. OFF: All electrical circuits are switched off. Main switch indicator light The main switch 1 is equipped with an indica- tor light 2 to avoid forgetting to turn it off.
  • Page 27 CONTROL FUNCTIONS INFO EC152000 CLUTCH LEVER The clutch lever 1 is located on the left han- dlebar; it disengages or engages the clutch. Pull the clutch lever to the handlebar to disen- gage the clutch, and release the lever to engage the clutch.
  • Page 28 CONTROL FUNCTIONS INFO EC157000 REAR BRAKE PEDAL The rear brake pedal 1 is located on the right side of the machine. Press down on the brake pedal to activate the rear brake. FUEL COCK The fuel cock supplies fuel from the tank to carburetor and also filters the fuel.
  • Page 29 CONTROL FUNCTIONS INFO LIGHTS SWITCH The lights switch 1 is located on the handle- bar. EC15F000 VALVE JOINT This valve joint 1 prevents fuel from flowing out and is installed to the fuel tank breather hose. CAUTION: In this installation, make sure the arrow faces the fuel tank and also downward.
  • Page 30: Fuel

    FUEL INFO FUEL Always use the recommended fuel as stated below. Also, be sure to use new gasoline the day of a race. Recommended fuel: Except for ZA: Premium unleaded gasoline only with a research octane number of 95 or higher. For ZA: Premium gasoline CAUTION:...
  • Page 31: Starting And Break-In

    STARTING AND BREAK-IN INFO STARTING AND BREAK-IN WARNING Never start or run the engine in a closed area. The exhaust fumes are poisonous; they can cause loss of consciousness and death in a very short time. Always operate the machine in a well-ventilated area. CAUTION: The carburetor on this machine has a built-in...
  • Page 32 STARTING AND BREAK-IN INFO NOTE: If the engine fails to start by pushing the start switch, release the switch, wait a few seconds, and then try again. Each starting attempt should be as short as possible to preserve the battery. Do not crank the engine more than 10 seconds on any one attempt.
  • Page 33 STARTING AND BREAK-IN INFO STARTING A WARM ENGINE Do not operate the cold starter knob and throt- tle. Pull the hot starter lever 1 and start the engine by pushing the start switch or by kick- ing the kickstarter forcefully with a firm stroke. As soon as the engine starts, release the hot starter lever to close the air passage.
  • Page 34 STARTING AND BREAK-IN INFO BREAK-IN PROCEDURES 1. Before starting the engine, fill the fuel tank with the fuel. 2. Perform the pre-operation checks on the machine. 3. Start and warm up the engine. Check the idle speed, and check the operation of the controls and the “ENGINE STOP”...
  • Page 35: Torque-Check Points

    TORQUE-CHECK POINTS INFO TORQUE-CHECK POINTS Frame construction Frame to rear frame Combined seat and tank Fuel tank to frame Exhaust system Silencer to rear frame Engine mounting Frame to engine Engine bracket to engine Engine bracket to frame Steering Steering shaft to Steering shaft to frame handlebar Steering shaft to handle crown...
  • Page 36: Cleaning And Storage

    CLEANING AND STORAGE INFO EC1B0000 CLEANING AND STORAGE EC1B1000 CLEANING Frequent cleaning of your machine will enhance its appearance, maintain good over- all performance, and extend the life of many components. 1. Before washing the machine, block off the end of the exhaust pipe to prevent water from entering.
  • Page 37 CLEANING AND STORAGE INFO 8. Automotive wax may be applied to all painted or chromed surfaces. Avoid com- bination cleaner-waxes, as they may con- tain abrasives. 9. After completing the above, start the engine and allow it to idle for several min- utes.
  • Page 38: Specifications

    SPEC GENERAL SPECIFICATIONS EC200000 SPECIFICATIONS EC211000 GENERAL SPECIFICATIONS Model name: WR450FR (USA) WR450F (EUROPE) WR450F(R) (CDN, AUS, NZ, ZA) Model code number: 5TJ1 (USA) 5TJ2 (EUROPE) 5TJ4 (CDN, AUS, NZ, ZA) Dimensions: Overall length 2,171 mm (85.5 in) Overall width 827 mm (32.6 in)
  • Page 39 SPEC GENERAL SPECIFICATIONS Oil capacity: Engine oil Periodic oil change 1.0 L (0.88 Imp qt, 1.06 US qt) With oil filter replacement 1.1 L (0.97 Imp qt, 1.16 US qt) Total amount 1.2 L (1.06 Imp qt, 1.27 US qt) Coolant capacity (including all routes): 1.6 L (1.41 Imp qt, 1.69 US qt) Air filter:...
  • Page 40 SPEC GENERAL SPECIFICATIONS Brake: Front brake type Single disc brake Operation Right hand operation Rear brake type Single disc brake Operation Right foot operation Suspension: Front suspension Telescopic fork Rear suspension Swingarm (link type monocross suspension) Shock absorber: Front shock absorber Coil spring/oil damper Rear shock absorber Coil spring/gas, oil damper...
  • Page 41: Maintenance Specifications

    SPEC MAINTENANCE SPECIFICATIONS MAINTENANCE SPECIFICATIONS ENGINE Item Standard Limit Cylinder head: Warp limit ---- 0.05 mm (0.002 in) Cylinder: Bore size 95.00 ~ 95.01 mm ---- (3.7402 ~ 3.7406 in) Out of round limit ---- 0.05 mm (0.002 in) Camshaft: Drive method Chain drive (Left) ----...
  • Page 42 SPEC MAINTENANCE SPECIFICATIONS Item Standard Limit Cam chain: Cam chain type/No. of links 98XRH2010-118M/118 ---- Cam chain adjustment method Automatic ---- Valve, valve seat, valve guide: Valve clearance (cold) 0.10 ~ 0.15 mm ---- (0.0039 ~ 0.0059 in) 0.20 ~ 0.25 mm ---- (0.0079 ~ 0.0098 in) Valve dimensions:...
  • Page 43 SPEC MAINTENANCE SPECIFICATIONS Item Standard Limit Valve spring: Free length 37.03 mm (1.46 in) 35.17 mm (1.38 in) 37.68 mm (1.48 in) 35.79 mm (1.41 in) Set length (valve closed) 27.87 mm (1.10 in) ---- 27.38 mm (1.08 in) ---- Compressed force (installed) 111.3 ~ 127.9 N at 27.87 mm...
  • Page 44 SPEC MAINTENANCE SPECIFICATIONS Item Standard Limit Piston rings: Top ring: Type Barrel ---- Dimensions (B × T) 1.2 × 3.5 mm (0.05 × 0.14 in) ---- End gap (installed) 0.20 ~ 0.30 mm 0.55 mm (0.008 ~ 0.012 in) (0.022 in) Side clearance (installed) 0.030 ~ 0.065 mm 0.12 mm...
  • Page 45 SPEC MAINTENANCE SPECIFICATIONS Item Standard Limit Clutch: Friction plate thickness 2.92 ~ 3.08 mm 2.8 mm (0.115 ~ 0.121 in) (0.110 in) Quantity ---- Clutch plate thickness 1.1 ~ 1.3 mm (0.043 ~ 0.051 in) ---- Quantity ---- Warp limit ---- 0.1 mm (0.004 in)
  • Page 46 SPEC MAINTENANCE SPECIFICATIONS Item Standard Limit Lubrication system: Oil filter type Paper type ---- Oil pump type Trochoid type ---- Tip clearance “A” 0.12 mm or less 0.20 mm (0.0047 in or less) (0.008 in) Tip clearance “B” 0.09 ~ 0.17 mm 0.24 mm (0.0035 ~ 0.0067 in) (0.009 in)
  • Page 47 SPEC MAINTENANCE SPECIFICATIONS Item Standard Lubrication chart: Pressure feed Oil tank Splashed scavenge Camshaft Cylinder head Valve lifter Piston Transmission gears Piston pin Main axle Crank pin Oil filter Drive axle Check ball Oil pump rotor 1 Oil pump rotor 2 Oil strainer Oil pan 2 - 10...
  • Page 48 SPEC MAINTENANCE SPECIFICATIONS Tightening torque Part to be tightened Thread size Q’ty m·kg ft·lb M10S × 1.0 Spark plug M6 × 1.0 Camshaft cap M12 × 1.0 Cylinder head blind plug screw M6 × 1.0 Cylinder head (stud bolt) M8 × 1.25 M10 ×...
  • Page 49 SPEC MAINTENANCE SPECIFICATIONS Tightening torque Part to be tightened Thread size Q’ty m·kg ft·lb M6 × 1.0 Oil check bolt Oil hose clamp – M6 × 1.0 Clutch cover M6 × 1.0 Crankcase cover (right) M6 × 1.0 Crankcase cover (left) M6 ×...
  • Page 50 SPEC MAINTENANCE SPECIFICATIONS EC212201 CHASSIS Item Standard Limit Steering system: Steering bearing type Taper roller bearing ---- Front suspension: USA, CDN EUROPE AUS, NZ, ZA 300 mm (11.8 in) ← ← Front fork travel 460 mm (18.1 in) ← ← Fork spring free length Spring rate, STD K = 4.51 N/mm...
  • Page 51 SPEC MAINTENANCE SPECIFICATIONS Item Standard Limit Wheel: Front wheel type Spoke wheel ---- Rear wheel type Spoke wheel ---- 21 × 1.60/Aluminum Front rim size/material ---- 18 × 2.15/Aluminum Rear rim size/material ---- Rim runout limit: Radial ---- 2.0 mm (0.08 in) Lateral ----...
  • Page 52 SPEC MAINTENANCE SPECIFICATIONS Tightening torque Part to be tightened Thread size Q’ty m·kg ft·lb M8 × 1.25 Handle crown and outer tube M8 × 1.25 Under bracket and outer tube M24 × 1.0 Handle crown and steering shaft 14.5 M8 × 1.25 Handlebar holder (upper) M28 ×...
  • Page 53 SPEC MAINTENANCE SPECIFICATIONS Tightening torque Part to be tightened Thread size Q’ty m·kg ft·lb M20 × 1.5 Rear wheel axle and nut 12.5 M8 × 1.25 Driven sprocket and wheel hub Nipple (spoke) – M6 × 1.0 Disc cover and rear brake caliper M6 ×...
  • Page 54 SPEC MAINTENANCE SPECIFICATIONS Tightening torque Part to be tightened Thread size Q’ty m·kg ft·lb M5 × 0.8 Meter cable holder and protector M8 × 1.25 Headlight stay (lower) and under bracket M6 × 1.0 Headlight body and headlight unit M6 × 1.0 Headlight mounting (left and right) M6 ×...
  • Page 55 Advancer type Electrical ---- C.D.I.: 248 ~ 372 Ω at 20 ˚C (68 ˚F) Pickup coil resistance (color) ---- (White – Red) CDI unit-model/manufacturer 5TJ-00/YAMAHA (For USA) ---- 5TJ-10/YAMAHA ---- (Except for USA) Ignition coil: Model/manufacturer 5TA-00/DENSO ---- Minimum spark gap 6 mm (0.24 in)
  • Page 56 SPEC MAINTENANCE SPECIFICATIONS Item Standard Limit Starter relay: Model/manufacturer 2768090-A/JIDECO ---- Amperage rating 180 A ---- 4.2 ~ 4.6 Ω at 20 ˚C (68 ˚F) Coil winding resistance ---- Starting circuit cut-off relay: Model/manufacturer ACM33221 M06/MATSUSHITA ---- 75.69 ~ 92.51 Ω at 20 ˚C (68 ˚F) Coil winding resistance ---- Fuse (amperage ×...
  • Page 57: General Torque Specifications

    GENERAL TORQUE SPECIFICATIONS/ SPEC DEFINITION OF UNITS EC220001 GENERAL TORQUE SPECIFICATIONS This chart specifies torque for standard fasten- ers with standard I.S.O. pitch threads. Torque specifications for special components or assemblies are included in the applicable sec- tions of this book. To avoid warpage, tighten multi-fastener assemblies in a crisscross fash- ion, in progressive stages, until full torque is reached.
  • Page 58: Lubrication Diagrams

    SPEC LUBRICATION DIAGRAMS LUBRICATION DIAGRAMS 1 Oil delivery pipe 2 Intake camshaft 3 Exhaust camshaft 4 Oil cleaner element 5 Oil pump 6 Main axle 7 Drive axle D - D A - A 2 - 21...
  • Page 59 SPEC LUBRICATION DIAGRAMS 1 Camshaft 2 Connecting rod 3 Oil cleaner element 4 Crankshaft 5 Main axle 6 Drive axle 7 Oil delivery pipe 2 - 22...
  • Page 60: Cable Routing Diagram

    SPEC CABLE ROUTING DIAGRAM EC240000 CABLE ROUTING DIAGRAM Ç Fasten the wire harness, recti- 1 Fuel tank breather hose G Lights switch lead 2 Clamp H Brake hose fier/regulator lead, coolant res- 3 Diode I Hose guide ervoir hose and hot starter cable 4 Wire harness J Carburetor breather hose to the frame with a plastic lock-...
  • Page 61 SPEC CABLE ROUTING DIAGRAM Ï Fasten the wire harness, TPS  Fasten the neutral switch lead Ø Pass the wire harness on the lead (in the wire harness), to the frame with a plastic band outside of the neutral switch starter motor lead and negative ends outward.
  • Page 62 SPEC CABLE ROUTING DIAGRAM Ï Fasten the grommet of the clutch 1 Hot starter cable I Rectifier/regulator bracket 2 Clutch cable cable with the cable holder. Å Pass the throttle cables, clutch Ì Fasten the CDI unit lead to the 3 Throttle cable (return) 4 Throttle cable (pull) cable and hot starter cable through...
  • Page 63 SPEC CABLE ROUTING DIAGRAM Å Install the brake hose so that its 1 Master cylinder 2 Brake hose holder pipe portion directs as shown and 3 Brake hose lightly touches the projection on the caliper. ı Pass the brake hose into the brake hose holders.
  • Page 64 SPEC CABLE ROUTING DIAGRAM Å Position the starter motor lead, Ï Fasten the coolant reservoir tank 1 Starter motor lead 2 Negative battery lead negative battery lead and wire breather hose and coolant reser- 3 Wire harness harness in the tank damper slit. voir hose to the frame with a plas- ı...
  • Page 65 SPEC CABLE ROUTING DIAGRAM Å Fasten the start switch lead and Ì Pass the throttle cables and clutch 1 Throttle cable 2 Brake hose lights switch lead to the handlebar cable between the handle crown 3 Clamp with a plastic band. and trip meter.
  • Page 66: Regular Inspection And Adjustments

    If you are a doubt as to what intervals to follow in maintaining and lubricating your machine, consult your Yamaha dealer. Every...
  • Page 67 INSP MAINTENANCE INTERVALS Every Every After Every As re- third fifth Item Remarks break-in race quired 500 km) 1,000 km) SHIFT FORK, SHIFT CAM, GUIDE BAR ● Inspect Inspect wear ROTOR NUT ● ● Retighten MUFFLER ● ● Inspect and retighten ●...
  • Page 68 ● Retighten sprocket bolt ● Inspect bearings ● Replace bearings ● Lubricate Lithium base grease THROTTLE, CONTROL CABLE Yamaha cable lube or ● ● Check routing and connection SAE 10W-30 motor oil ● ● Lubricate HOT STARTER, CLUTCH LEVER ●...
  • Page 69: Pre-Operation Inspection And Maintenance

    INSP PRE-OPERATION INSPECTION AND MAINTENANCE EC320000 PRE-OPERATION INSPECTION AND MAINTENANCE Before riding for break-in operation, practice or a race, make sure the machine is in good operating condition. Before using this machine, check the following points. GENERAL INSPECTION AND MAINTENANCE Item Routine Page...
  • Page 70: Engine

    ENGINE/COOLANT LEVEL INSPECTION/ INSP COOLANT REPLACEMENT EC350000 ENGINE COOLANT LEVEL INSPECTION WARNING Do not remove the radiator cap 1, drain bolt and hoses when the engine and radia- tor are hot. Scalding hot fluid and steam may be blown out under pressure, which could cause serious injury.
  • Page 71: Coolant Replacement

    INSP COOLANT REPLACEMENT CAUTION: Take care so that coolant does not splash on painted surfaces. If it splashes, wash it away with water. 1. Place a container under the engine. 2. Remove: Seat Refer to “SEAT, FUEL TANK AND SIDE COVERS” section in the CHAP- TER 4.
  • Page 72 INSP COOLANT REPLACEMENT 9. Fill: Radiator Engine To specified level. Recommended coolant: High quality ethylene glycol anti-freeze containing anti-corrosion for aluminum engine Coolant 1 and water (soft water) 2 mixing ratio: 50%/50% Coolant capacity: 1.25 L (1.10 Imp qt, 1.32 US qt) CAUTION: Do not mix more than one type of ethyl- ene glycol antifreeze containing corro-...
  • Page 73: Radiator Cap Inspection

    RADIATOR CAP INSPECTION/ INSP RADIATOR CAP OPENING PRESSURE INSPECTION 12. Install: Coolant reservoir cap 13. Start the engine and let it warm up for several minutes. 14. Turn off the engine and inspect the cool- ant level. Refer to “COOLANT LEVEL INSPEC- TION”...
  • Page 74 INSP COOLING SYSTEM INSPECTION 3. Inspect: Pressure Impossible to maintain the specified pressure for 10 seconds → Replace. EC357002 COOLING SYSTEM INSPECTION 1. Inspect: Coolant level 2. Attach: Radiator cap tester 1 and adapter 2 Radiator cap tester: YU-24460-01/90890-01325 Adapter: YU-33984/90890-01352 3.
  • Page 75 CLUTCH ADJUSTMENT/ INSP THROTTLE CABLE ADJUSTMENT EC359020 CLUTCH ADJUSTMENT 1. Check: Clutch lever free play a Out of specification → Adjust. Clutch lever free play a: 8 ~ 13 mm (0.31 ~ 0.51 in) 2. Adjust: Clutch lever free play Clutch lever free play adjustment steps: Loosen the locknut 1.
  • Page 76 THROTTLE LUBRICATION/ INSP HOT STARTER LEVER ADJUSTMENT NOTE: Before adjusting the throttle cable free play, the engine idle speed should be adjusted. WARNING After adjusting the throttle cable free play, start the engine and turn the han- dlebar to right and left and make sure that the engine idling does not run faster.
  • Page 77 INSP AIR FILTER CLEANING AIR FILTER CLEANING NOTE: Proper air filter maintenance is the biggest key to preventing premature engine wear and damage. CAUTION: Never run the engine without the air filter element in place; this would allow dirt and dust to enter the engine and cause rapid wear and possible engine damage.
  • Page 78 INSP AIR FILTER CLEANING CAUTION: Do not twist the element when squeezing the element. Leaving too much of solvent in the ele- ment may result in poor starting. 5. Inspect: Air filter element Damage → Replace. 6. Apply: Foam-air-filter oil or equivalent oil to the element.
  • Page 79 INSP ENGINE OIL LEVEL INSPECTION ENGINE OIL LEVEL INSPECTION 1. Stand the motorcycle on a level surface. NOTE: When checking the oil level make sure that the motorcycle is upright. Place the motorcycle on a suitable stand. WARNING Never remove the oil tank cap just after high speed operation.
  • Page 80 INSP ENGINE OIL LEVEL INSPECTION (For USA and CDN) Recommended oil: At 5 ˚C (40 ˚F) or higher Å Yamalube 4 (20W-40) or SAE 20W-40 type SG motor oil (Non-Friction modified) At 15 ˚C (60 ˚F) or lower ı Yamalube 4 (10W-30) or SAE 10W-30 type SG motor oil (Non-Friction modified) and/or...
  • Page 81 INSP ENGINE OIL REPLACEMENT 6. Idle the engine more than 10 seconds while keeping the motorcycle upright. Then stop the engine and add the oil to the maximum level. 7. Install: Oil tank cap ENGINE OIL REPLACEMENT 1. Start the engine and let it warm up for several minutes.
  • Page 82: Engine Oil Replacement

    INSP ENGINE OIL REPLACEMENT 6. If the oil filter is to be replaced during this oil change, remove the following parts and reinstall them. Replacement steps: Remove the exhaust pipe. Remove the oil filter cover 1 and oil filter element 2. Check the O-rings 3, if cracked or dam- aged, replace them with a new one.
  • Page 83 INSP PILOT SCREW ADJUSTMENT 12. Check: Oil pressure Checking steps: Slightly loosen the oil gallery bolt 1. Start the engine and keep it idling until oil starts to seep from the oil gallery bolt. If no oil comes out after one minute, turn the engine off so it will not seize.
  • Page 84 IDLE SPEED ADJUSTMENT/ INSP VALVE CLEARANCE ADJUSTMENT EC35M021 IDLE SPEED ADJUSTMENT 1. Start the engine and thoroughly warm it 2. Adjust: Idle speed Adjustment steps: Adjust the pilot screw. Refer to “PILOT SCREW ADJUSTMENT” section. Turn the throttle stop screw 1 until the engine runs at the lowest possible speed.
  • Page 85 INSP VALVE CLEARANCE ADJUSTMENT 4. Check: Valve clearance Out of specification → Adjust. Valve clearance (cold): Intake valve: 0.10 ~ 0.15 mm (0.0039 ~ 0.0059 in) Exhaust valve: 0.20 ~ 0.25 mm (0.0079 ~ 0.0098 in) Checking steps: Turn the crankshaft counterclockwise with a wrench.
  • Page 86 INSP VALVE CLEARANCE ADJUSTMENT 5. Adjust: Valve clearance Adjustment steps: Loosen the timing chain tensioner cap bolt. Remove the timing chain tensioner and camshaft caps. NOTE: Remove the camshaft cap bolts in a criss- cross pattern from the outside working inwards.
  • Page 87 INSP VALVE CLEARANCE ADJUSTMENT Round off the last digit of the installed pad number to the nearest increment. Last digit of pad Rounded value number 0, 1 or 2 4, 5 or 6 8 or 9 EXAMPLE: Installed pad number = 148 Rounded off value = 150 NOTE: Pads can only be selected in 0.05 mm incre-...
  • Page 88 INSP VALVE CLEARANCE ADJUSTMENT Install the timing chain tensioner. Refer to “CAMSHAFTS” section in the CHAPTER 4. NOTE: Turn the crankshaft counterclockwise sev- eral turns so that the installed parts settle into the right position. Recheck the valve clearance. If the clearance is still incorrect, repeat all the clearance adjustment steps until the specified clearance is obtained.
  • Page 89: Valve Clearance Adjustment

    INSP VALVE CLEARANCE ADJUSTMENT INTAKE MEASURED INSTALLED PAD NUMBER CLEARANCE 120 125 130 135 140 145 150 155 160 165 170 175 180 185 190 195 200 205 210 215 220 225 230 235 240 0.00 ~ 0.04 120 125 130 135 140 145 150 155 160 165 170 175 180 185 190 195 200 205 210 215 220 225 230 0.05 ~ 0.09 120 125 130 135 140 145 150 155 160 165 170 175 180 185 190 195 200 205 210 215 220 225 230 235 0.10 ~ 0.15...
  • Page 90 INSP SPARK ARRESTER CLEANING (For USA) SPARK ARRESTER CLEANING (For USA) WARNING Be sure the exhaust pipe and muffler are cool before cleaning the spark arrester. Do not start the engine when cleaning the exhaust system. 1. Remove: Bolt (spark arrester) 1 2.
  • Page 91: Chassis

    INSP CHASSIS/BRAKE SYSTEM AIR BLEEDING EC360000 CHASSIS EC361012 BRAKE SYSTEM AIR BLEEDING WARNING Bleed the brake system if: The system has been disassembled. A brake hose has been loosened or removed. The brake fluid is very low. The brake operation is faulty. Å...
  • Page 92 INSP FRONT BRAKE ADJUSTMENT NOTE: If bleeding is difficult, it may be necessary to let the brake fluid system stabilize for a few hours. Repeat the bleeding procedure when the tiny bubbles in the system have disap- peared. j. Add brake fluid to the level line on the reservoir.
  • Page 93: Rear Brake Adjustment

    REAR BRAKE ADJUSTMENT/ INSP FRONT BRAKE PAD INSPECTION AND REPLACEMENT EC364002 REAR BRAKE ADJUSTMENT 1. Check: Brake pedal height a Out of specification → Adjust. Brake pedal height a: 5 mm (0.20 in) 2. Adjust: Brake pedal height Pedal height adjustment steps: Loosen the locknut 1.
  • Page 94 INSP FRONT BRAKE PAD INSPECTION AND REPLACEMENT Loosen the pad pin 2. Remove the brake hose holder 3 and cal- iper 4 from the front fork. Remove the pad pin and brake pads 5. Connect the transparent hose 6 to the bleed screw 7 and place the suitable con- tainer under its end.
  • Page 95 INSP REAR BRAKE PAD INSPECTION AND REPLACEMENT Install the pad pin plug B. Pad pin plug: 3 Nm (0.3 m • kg, 2.2 ft • lb) 3. Inspect: Brake fluid level Refer “BRAKE FLUID LEVEL INSPECTION” section. 4. Check: Brake lever operation A softy or spongy feeling →...
  • Page 96 INSP REAR BRAKE PAD INSPECTION AND REPLACEMENT Remove the pad pin 6 and brake pads 7. Connect the transparent hose 8 to the bleed screw 9 and place the suitable con- tainer under its end. Loosen the bleed screw and push the cali- per piston in.
  • Page 97 REAR BRAKE PAD INSULATOR INSPECTION/ INSP BRAKE FLUID LEVEL INSPECTION 3. Inspect: Brake fluid level Refer “BRAKE FLUID LEVEL INSPECTION” section. 4. Check: Brake pedal operation A softy or spongy feeling → Bleed brake system. Refer “BRAKE SYSTEM BLEEDING” section. EC36b000 REAR BRAKE PAD INSULATOR INSPECTION...
  • Page 98 INSP SPROCKETS INSPECTION/DRIVE CHAIN INSPECTION EC368000 SPROCKETS INSPECTION 1. Inspect: Sprocket teeth a Excessive wear → Replace. NOTE: Replace the drive, driven sprockets and drive chain as a set. DRIVE CHAIN INSPECTION 1. Remove: Drive chain 1 NOTE: Remove the drive chain using a chain cutter 2.
  • Page 99 INSP DRIVE CHAIN INSPECTION 5. Check: Drive chain stiffness a Clean and oil the chain and hold as illustrated. Stiff → Replace the drive chain. 6. Install: Joint 1 O-ring 2 Drive chain 3 NOTE: When installing the drive chain, apply the lith- ium soap base grease on the joint and O-rings.
  • Page 100 INSP DRIVE CHAIN SLACK ADJUSTMENT DRIVE CHAIN SLACK ADJUSTMENT 1. Elevate the rear wheel by placing the suitable stand under the engine. 2. Check: Drive chain slack a Above the seal guard installation bolt. Out of specification → Adjust. Drive chain slack: 40 ~ 50 mm (1.6 ~ 2.0 in) NOTE: Before checking and/or adjusting, rotate the...
  • Page 101: Front Fork Inspection

    FRONT FORK INSPECTION/ INSP FRONT FORK OIL SEAL AND DUST SEAL CLEANING Tighten the axle nut while pushing down the drive chain. Axle nut: 125 Nm (12.5 m • kg, 90 ft • lb) Tighten the locknuts. Locknut: 16 Nm (1.6 m • kg, 11 ft • lb) EC36C000 FRONT FORK INSPECTION 1.
  • Page 102 INSP FRONT FORK INTERNAL PRESSURE RELIEVING/ FRONT FORK REBOUND DAMPING FORCE ADJUSTMENT FRONT FORK INTERNAL PRESSURE RELIEVING NOTE: If the front fork initial movement feels stiff dur- ing a run, relieve the front fork internal pres- sure. 1. Elevate the front wheel by placing a suit- able stand under the engine.
  • Page 103 FRONT FORK COMPRESSION DAMPING FORCE INSP ADJUSTMENT STANDARD POSITION: This is the position which is back by the spe- cific number of clicks from the fully turned-in position. Standard position: 10 clicks out * 8 clicks out * For EUROPE, AUS, NZ and ZA CAUTION: Do not force the adjuster past the minimum or maximum extent of adjustment.
  • Page 104 INSP REAR SHOCK ABSORBER INSPECTION STANDARD POSITION: This is the position which is back by the spe- cific number of clicks from the fully turned-in position. Standard position: 13 clicks out CAUTION: Do not force the adjuster past the minimum or maximum extent of adjustment.
  • Page 105 REAR SHOCK ABSORBER SPRING PRELOAD INSP ADJUSTMENT REAR SHOCK ABSORBER SPRING PRELOAD ADJUSTMENT 1. Elevate the rear wheel by placing the suitable stand under the engine. 2. Remove: Rear frame 3. Loosen: Locknut 1 4. Adjust: Spring preload By turning the adjuster 2. Stiffer →...
  • Page 106 REAR SHOCK ABSORBER REBOUND DAMPING FORCE INSP ADJUSTMENT EC36N014 REAR SHOCK ABSORBER REBOUND DAMPING FORCE ADJUSTMENT 1. Adjust: Rebound damping force By turning the adjuster 1 . Stiffer a → Increase the rebound damp- ing force. (Turn the adjuster 1 in.) Softer b →...
  • Page 107 REAR SHOCK ABSORBER LOW COMPRESSION INSP DAMPING FORCE ADJUSTMENT EC36c000 REAR SHOCK ABSORBER LOW COMPRESSION DAMPING FORCE ADJUSTMENT 1. Adjust: Low compression damping force By turning the adjuster 1 . Stiffer a → Increase the low compres- sion damping force. (Turn the adjuster 1 in.) Softer b →...
  • Page 108 REAR SHOCK ABSORBER HIGH COMPRESSION INSP DAMPING FORCE ADJUSTMENT EC36d000 REAR SHOCK ABSORBER HIGH COMPRESSION DAMPING FORCE ADJUSTMENT 1. Adjust: High compression damping force By turning the adjuster 1 . Stiffer a → Increase the high compres- sion damping force. (Turn the adjuster 1 in.) Softer b →...
  • Page 109 TIRE PRESSURE CHECK/SPOKES INSPECTION AND INSP TIGHTENING/WHEEL INSPECTION EC36Q000 TIRE PRESSURE CHECK 1. Measure: Tire pressure Out of specification → Adjust. Standard tire pressure: 100 kPa (1.0 kgf/cm , 15 psi) NOTE: Check the tire while it is cold. Loose bead stoppers allow the tire to slip off its position on the rim when the tire pressure is low.
  • Page 110 INSP STEERING HEAD INSPECTION AND ADJUSTMENT 2. Inspect: Bearing free play Exist play → Replace. STEERING HEAD INSPECTION AND ADJUSTMENT 1. Elevate the front wheel by placing a suit- able stand under the engine. 2. Check: Steering shaft Grasp the bottom of the forks and gen- tly rock the fork assembly back and forth.
  • Page 111 INSP STEERING HEAD INSPECTION AND ADJUSTMENT Tighten the ring nut 3 using ring nut wrench 4. NOTE: Set the torque wrench to the ring nut wrench so that they form a right angle. Ring nut wrench: YU-33975/90890-01403 Ring nut (initial tightening): 38 Nm (3.8 m •...
  • Page 112 INSP LUBRICATION Å Use Yamaha cable lube or equivalent on these LUBRICATION areas. To ensure smooth operation of all compo- ı Use SAE 10W-30 motor oil or suitable chain nents, lubricate your machine during setup, lubricants. after break-in, and after every race.
  • Page 113: Electrical

    INSP ELECTRICAL/SPARK PLUG INSPECTION EC370000 ELECTRICAL EC371001 SPARK PLUG INSPECTION 1. Remove: Spark plug 2. Inspect: Electrode 1 Wear/damage → Replace. Insulator color 2 Normal condition is a medium to light tan color. Distinctly different color → Check the engine condition. NOTE: When the engine runs for many hours at low speeds, the spark plug insulator will become...
  • Page 114 INSP IGNITION TIMING CHECK IGNITION TIMING CHECK 1. Remove: Timing plug 1 2. Attach: Timing light Inductive tachometer To the ignition coil lead (orange lead Timing light: YM-33277-A/90890-03141 Inductive tachometer: YU-8036-B Engine tachometer: 90890-03113 3. Check: Ignition timing Checking steps: Start the engine and let it warm up.
  • Page 115 INSP BATTERY INSPECTION AND CHARGING BATTERY INSPECTION AND CHARGING WARNING Batteries generate explosive hydrogen gas and contain electrolyte which is made of poisonous and highly caustic sulfuric acid. Therefore, always follow these preventive measures: Wear protective eye gear when handling or working near batteries.
  • Page 116 INSP BATTERY INSPECTION AND CHARGING NOTE: Since MF batteries are sealed, it is not possi- ble to check the charge state of the battery by measuring the specific gravity of the electro- lyte. Therefore, the charge of the battery has to be checked by measuring the voltage at the battery terminals.
  • Page 117 INSP BATTERY INSPECTION AND CHARGING Å Check the charge of the battery, as shown in the charts and the following example. Example Open-circuit voltage = 12.0 V Charging time = 6.5 hours Charge of the battery = 20 ~ 30% Å...
  • Page 118 INSP BATTERY INSPECTION AND CHARGING Before removing the battery charger lead clips from the battery terminals, be sure to turn off the battery charger. Make sure the battery charger lead clips are in full contact with the battery termi- nal and that they are not shorted. A cor- roded battery charger lead clip may generate heat in the contact area and a weak clip spring may cause sparks.
  • Page 119 INSP BATTERY INSPECTION AND CHARGING Charging method using a variable voltage charger 3 - 54...
  • Page 120 INSP BATTERY INSPECTION AND CHARGING Charging method using a constant voltage charger 3 - 55...
  • Page 121 INSP FUSE INSPECTION 6. Install: Battery Battery band 7. Connect: Battery leads (to the battery terminals) CAUTION: First, connect the positive lead 1, then the negative lead 2. 8. Check: Battery terminals Dirt → Clean with a wire brush. Loose connection → Connect properly. 9.
  • Page 122 INSP REPLACING THE HEADLIGHT BULBS 3. Replace: Blown fuse Replacement steps: Set the main switch to “OFF”. Install a new fuse of the correct amperage. Set on the switches to verify if the electri- cal circuit is operational. If the fuse immediately blows again, check the electrical circuit.
  • Page 123 INSP ADJUSTING THE HEADLIGHT BEAMS 5. Install: Headlight bulb Secure the new headlight bulb with the headlight bulb holder. CAUTION: Avoid touching the glass part of the head- light bulb to keep it free form oil, otherwise the transparency of the glass, the life of the bulb and the luminous flux will be adversely affected.
  • Page 124: Seat, Fuel Tank And Side Covers

    SEAT, FUEL TANK AND SIDE COVERS EC400000 ENGINE EC4R0000 SEAT, FUEL TANK AND SIDE COVERS Extent of removal: 1 Seat removal 2 Fuel tank removal 3 Side covers removal 4 Headlight removal Extent of removal Order Part name Q’ty Remarks SEAT, FUEL TANK AND SIDE COVERS REMOVAL Preparation for removal...
  • Page 125 SEAT, FUEL TANK AND SIDE COVERS REMOVAL POINTS Side cover 1. Remove: Bolt (side cover) Side cover (left) 1 Side cover (right) 2 NOTE: Draw the side cover downward to remove it because its claws a are inserted in the air fil- ter case.
  • Page 126: Exhaust Pipe And Silencer

    EXHAUST PIPE AND SILENCER EC4S0000 EXHAUST PIPE AND SILENCER Å For USA ı Except for USA Extent of removal: 1 Silencer removal 2 Exhaust pipe removal Extent of removal Order Part name Q’ty Remarks EXHAUST PIPE AND SILENCER REMOVAL Preparation for removal Side cover (right) Refer to “SEAT, FUEL TANK AND SIDE COVERS”...
  • Page 127 EXHAUST PIPE AND SILENCER INSPECTION Exhaust pipe and silencer 1. Inspect: Gasket 1 Damage → Replace. ASSEMBLY AND INSTALLATION Exhaust pipe and silencer 1. Install: Gasket Exhaust pipe 1 Nut (exhaust pipe) 2 13 Nm (1.3 m · kg, 9.4 ft · lb) Bolt (exhaust pipe) 3 24 Nm (2.4 m ·...
  • Page 128: Radiator

    RADIATOR EC450001 RADIATOR Extent of removal: 1 Radiator removal 2 Coolant reservoir removal Extent of removal Order Part name Q’ty Remarks RADIATOR REMOVAL Preparation for removal Drain the coolant. Refer to “COOLANT REPLACEMENT” section in the CHAPTER 3. Seat, fuel tank and side cover Refer to “SEAT, FUEL TANK AND SIDE COVERS”...
  • Page 129 RADIATOR EC456000 HANDLING NOTE WARNING Do not remove the radiator cap when the engine and radiator are hot. Scalding hot fluid and steam may be blown out under pressure, which could cause serious injury. When the engine has cooled, open the radi- ator cap by the following procedure: Place a thick rag, like a towel, over the radi- ator cap, slowly rotate the cap counter-...
  • Page 130 RADIATOR 3. Install: Radiator breather hose 1 Radiator (right) 2 10 Nm (1.0 m · kg, 7.2 ft · lb) Refer to “CABLE ROUTING DIA- GRAM” section in the CHAPTER 2. 4. Install: Panel 1 Bolt (radiator panel upper) 2 10 Nm (1.0 m ·...
  • Page 131: Carburetor

    CARBURETOR CARBURETOR 4 Nm (0.4 m kg, 2.9 ft • • 2 Nm (0.2 m kg, 1.4 ft • • 11 Nm (1.1 m kg, 8.0 ft • • 4 Nm (0.4 m kg, 2.9 ft • • 3 Nm (0.3 m kg, 2.2 ft •...
  • Page 132 CARBURETOR CARBURETOR DISASSEMBLY Extent of removal: 1 Carburetor disassembly Extent of removal Order Part name Q’ty Remarks CARBURETOR DISASSEMBLY Breather hose Valve lever housing cover Screw (throttle shaft) Throttle valve Needle holder Jet needle Cover Spring Diaphragm (accelerator pump) Air cut valve cover Spring (air cut valve) Diaphragm (air cut valve) Float chamber...
  • Page 133 CARBURETOR Extent of removal Order Part name Q’ty Remarks Needle valve Main jet Needle jet Spacer Pilot jet Starter jet Push rod Pull the push rod. Throttle shaft assembly Push rod link lever assembly Pilot air jet Cold starter plunger 4 - 10...
  • Page 134 CARBURETOR EC466020 HANDLING NOTE CAUTION: Do not loosen the screws {TPS (throttle position sensor)} 1 except when changing the TPS (throttle position sensor) due to failure because it will cause a drop in engine performance. REMOVAL POINTS Pilot screw 1. Remove: Pilot screw 1 NOTE: To optimize the fuel flow at a small throttle...
  • Page 135 CARBURETOR Needle valve 1. Inspect: Needle valve 1 Valve seat 2 Grooved wear a → Replace. Dust b → Clean. EC464300 Throttle valve 1. Check: Free movement Stick → Repair or replace. Insert the throttle valve 1 into the car- buretor body, and check for free move- ment.
  • Page 136 CARBURETOR Measurement and adjustment steps: Hold the carburetor in an upside down position. NOTE: Slowly tilt the carburetor in the opposite direction, then take the measurement when the needle valve aligns with the float arm. If the carburetor is level, the weight of the float will push in the needle valve, result- ing in an incorrect measurement.
  • Page 137 CARBURETOR Accelerator pump 1. Inspect: Diaphragm (accelerator pump) 1 Spring 2 Cover 3 O-ring 4 Push rod 5 Tears (diaphragm)/damage → Replace. Dirt → Clean. 2. Inspect: Throttle shaft 1 Spring 2 Lever 1 3 Spring 1 4 Lever 2 5 Spring 2 6 Dirt →...
  • Page 138 CARBURETOR 3. Install: Spring 1 1 Lever 1 2 To lever 2 3. NOTE: Make sure the spring 1 fits on the stopper a of the lever 2. 4. Install: Spring 2 1 To lever 2 2. 5. Install: Push rod link lever assembly 1 NOTE: Make sure the stopper a of the spring 2 fits into the recess b in the carburetor.
  • Page 139 CARBURETOR 8. Install: 1 2 3 Throttle shaft assembly 1 Plain washer (metal) 2 Plain washer (resin) 3 Valve lever 4 NOTE: Apply the fluorochemical grease on the bear- ings. Fit the projection a on the throttle shaft assembly into the slot b in the TPS (throttle position sensor).
  • Page 140 CARBURETOR 11. Install: Needle valve 1 Float 2 Float pin 3 NOTE: After installing the needle valve to the float, install them to the carburetor. Check the float for smooth movement. 12. Install: Pilot screw 1 Spring 2 Washer 3 O-ring 4 Note the following installation points: Turn in the pilot screw until it is lightly...
  • Page 141 CARBURETOR 15. Install: Diaphragm (accelerator pump) 1 Spring 2 O-ring 3 Cover 4 Hose holder (drain hose) 5 Screw (cover) 6 NOTE: Install the diaphragm (accelerator pump) with its mark a facing the spring. 16. Install: Jet needle 1 Collar 2 Spring 3 Needle holder 4 Throttle valve plate 5...
  • Page 142 CARBURETOR Accelerator pump timing adjustment Adjustment steps: NOTE: In order for the throttle valve height a to achieve the specified value, tuck under the throttle valve plate 1 the rod 2 etc. with the same outer diameter as the specified value.
  • Page 143 CARBURETOR 4. Tighten: Screw (air cleaner joint) 1 3 Nm (0.3 m · kg, 2.2 ft · lb) Screw (carburetor joint) 2 3 Nm (0.3 m · kg, 2.2 ft · lb) 5. Install: Throttle cable (pull) 1 4 Nm (0.4 m · kg, 2.9 ft · lb) Throttle cable (return) 2 11 Nm (1.1 m ·...
  • Page 144: Camshafts

    CAMSHAFTS CAMSHAFTS CYLINDER HEAD COVER Extent of removal: 1 Cylinder head cover removal Extent of removal Order Part name Q’ty Remarks CYLINDER HEAD COVER REMOVAL Preparation for removal Seat and fuel tank Refer to “SEAT, FUEL TANK AND SIDE COVERS” section. Carburetor Refer to “CARBURETOR”...
  • Page 145 CAMSHAFTS CAMSHAFTS Extent of removal: 1 Camshaft removal Extent of removal Order Part name Q’ty Remarks CAMSHAFTS REMOVAL Timing plug Straight plug Tensioner cap bolt Timing chain tensioner Gasket Refer to “REMOVAL POINTS”. Bolt (camshaft cap) Camshaft cap Clip Exhaust camshaft Intake camshaft 4 - 22...
  • Page 146 CAMSHAFTS REMOVAL POINTS Camshaft 1. Remove: Timing plug 1 Straight plug 2 2. Align: “I” mark With stationary pointer. Checking steps: Turn the crankshaft counterclockwise with a wrench. Align the “I” mark a on the rotor with the stationary pointer b on the crankcase cover.
  • Page 147 CAMSHAFTS 6. Remove: Clips Exhaust camshaft 1 Intake camshaft 2 NOTE: Attach a wire 3 to the timing chain to prevent it from falling into the crankcase. INSPECTION Camshaft 1. Inspect: Cam lobes Pitting/scratches/blue discoloration → Replace. 2. Measure: Cam lobes length a and b Out of specification →...
  • Page 148 CAMSHAFTS 4. Measure: Camshaft-to-cap clearance Out of specification → Measure cam- shaft journal diameter. Camshaft-to-cap clearance: 0.020 ~ 0.054 mm (0.0008 ~ 0.0021 in) <Limit>: 0.08 mm (0.003 in) Measurement steps: Install the camshaft onto the cylinder head. ® Position a strip of Plastigauge 1 onto the camshaft.
  • Page 149 CAMSHAFTS Decompression system 1. Check: Decompression system Checking steps: Check that the decompressor cam 1 moves smoothly. Check that the decompressor lever pin 2 projects from the camshaft. Timing chain tensioner 1. Check: While pressing the tensioner rod lightly with fingers, use a thin screwdriver 1 and wind the tensioner rod up fully clockwise.
  • Page 150 CAMSHAFTS Fit the timing chain 3 onto both camshaft sprockets and install the camshafts on the cylinder head. NOTE: The camshafts should be installed onto the cylinder head so that the exhaust cam sprocket punch mark c and the intake cam sprocket punch mark d align with the sur- face of the cylinder head.
  • Page 151 CAMSHAFTS With the rod fully wound and the chain tensioner UP mark a facing upward, install the gasket 1 and the chain ten- sioner 2, and tighten the bolt 3 to the specified torque. Bolt (timing chain tensioner): 10 Nm (1.0 m • kg, 7.2 ft • lb) Release the screwdriver, check the ten- sioner rod to come out and tighten the gasket 4 and the cap bolt 5 to the speci-...
  • Page 152: Cylinder Head

    CYLINDER HEAD CYLINDER HEAD CYLINDER HEAD Extent of removal: 1 Cylinder head removal Extent of removal Order Part name Q’ty Remarks CYLINDER HEAD REMOVAL Preparation for removal Seat and fuel tank Refer to “SEAT, FUEL TANK AND SIDE COVERS” section. Exhaust pipe and silencer Refer to “EXHAUST PIPE AND SILENCER”...
  • Page 153 CYLINDER HEAD INSPECTION Cylinder head 1. Eliminate: Carbon deposits (from the combustion chambers) Use a rounded scraper. NOTE: Do not use a sharp instrument to avoid dam- aging or scratching: Spark plug threads Valve seats 2. Inspect: Cylinder head Scratches/damage → Replace. 3.
  • Page 154 CYLINDER HEAD ASSEMBLY AND INSTALLATION 1. Install: Timing chain guide (front) 1 Dowel pin 2 Cylinder head gasket 3 Cylinder head 4 NOTE: While pulling up the timing chain, install the timing chain guide (front) and cylinder head. 2. Install: Plain washer 1 Bolt [L=160 mm (6.30 in)] 2 Bolt [L=150 mm (5.91 in)] 3...
  • Page 155 CYLINDER HEAD Remove the bolts. Again apply the molybdenum disulfide grease on the threads and contact sur- faces of the bolts and on both contact sur- faces of the plain washers. Retighten the bolts. NOTE: Tighten the bolts to the specified torque in two or three steps in the proper tightening sequence as shown.
  • Page 156: Valves And Valve Springs

    VALVES AND VALVE SPRINGS VALVES AND VALVE SPRINGS VALVES AND VALVE SPRINGS Extent of removal: 1 Valve removal Extent of removal Order Part name Q’ty Remarks VALVES AND VALVE SPRINGS REMOVAL Preparation for removal Cylinder head Refer to “CYLINDER HEAD” section. Valve lifter Use special tool.
  • Page 157 VALVES AND VALVE SPRINGS REMOVAL POINTS 1. Remove: Valve lifters 1 Pads 2 NOTE: Identify each lifter 1 and pad 2 position very carefully so that they can be reinstalled in their original place. 2. Check: Valve sealing Leakage at the valve seat → Inspect the valve face, valve seat and valve seat width.
  • Page 158 VALVES AND VALVE SPRINGS INSPECTION Valve 1. Measure: Stem-to-guide clearance Stem-to-guide clearance = valve guide inside diameter a – valve stem diameter b Out of specification → Replace the valve guide. Clearance (stem to guide): Intake: 0.010 ~ 0.037 mm (0.0004 ~ 0.0015 in) <Limit>: 0.08 mm (0.003 in) Exhaust:...
  • Page 159 VALVES AND VALVE SPRINGS Valve guide remover: Intake: 4.5 mm (0.18 in) YM-4116/90890-04116 Exhaust: 5.0 mm (0.20 in) YM-4097/90890-04097 Valve guide installer: Intake: YM-4117/90890-04117 Exhaust: YM-4098/90890-04098 Valve guide reamer: Intake: 4.5 mm (0.18 in) YM-4118/90890-04118 Exhaust: 5.0 mm (0.20 in) YM-4099/90890-04099 NOTE: After replacing the valve guide reface the...
  • Page 160 VALVES AND VALVE SPRINGS 5. Measure: Runout (valve stem) Out of specification → Replace. Runout limit: 0.01 mm (0.0004 in) NOTE: When installing a new valve always replace the guide. If the valve is removed or replaced always replace the oil seal. 6.
  • Page 161 VALVES AND VALVE SPRINGS 9. Lap: Valve face Valve seat NOTE: After refacing the valve seat or replacing the valve and valve guide, the valve seat and valve face should be lapped. Lapping steps: Apply a coarse lapping compound to the valve face.
  • Page 162 VALVES AND VALVE SPRINGS Valve spring 1. Measure: Valve spring free length a Out of specification → Replace. Free length (valve spring): Intake: 37.03 mm (1.46 in) <Limit>: 35.17 mm (1.38 in) Exhaust: 37.68 mm (1.48 in) <Limit>: 35.79 mm (1.41 in) 2.
  • Page 163 VALVES AND VALVE SPRINGS Combination of cylinder head and valve lifter 1. Combination: For this combination, match the paint color on the cylinder head with that on the valve lifter according to the chart below. Combination Cylinder head mark Valve lifter mark a (color) b (color) Blue...
  • Page 164 VALVES AND VALVE SPRINGS 3. Install: Valve cotters NOTE: While compressing the valve spring with a valve spring compressor 1 install the valve cotters. Valve spring compressor: YM-4019/90890-04019 4. To secure the valve cotters onto the valve stem, lightly tap the valve tip with a piece of wood.
  • Page 165: Cylinder And Piston

    CYLINDER AND PISTON CYLINDER AND PISTON CYLINDER AND PISTON Extent of removal: 1 Cylinder removal 2 Piston removal Extent of removal Order Part name Q’ty Remarks CYLINDER AND PISTON REMOVAL Preparation for removal Cylinder head Refer to “CYLINDER HEAD” section. Bolt (cylinder) Cylinder Gasket...
  • Page 166 CYLINDER AND PISTON REMOVAL POINTS Piston 1. Remove: Piston pin clips 1 Piston pin 2 Piston 3 NOTE: Put identification marks on each piston head for reference during reinstallation. Before removing each piston pin, deburr the clip groove and pin hole area. If the piston pin groove is deburred and the piston pin is still difficult to remove, use the piston pin puller 4 .
  • Page 167 CYLINDER AND PISTON 95.00 ~ 95.01 mm Cylinder bore “C” (3.7402 ~ 3.7406 in) Taper limit “T” 0.05 mm (0.002 in) Out of round “R” 0.05 mm (0.002 in) “C” = Maximum D “T” = (Maximum D or D – (Maximum D or D “R”...
  • Page 168 CYLINDER AND PISTON Piston ring 1. Measure: Ring side clearance Use a feeler gauge 1 . Out of specification → Replace the pis- ton and rings as a set. NOTE: Clean carbon from the piston ring grooves and rings before measuring the side clearance. Side clearance: Standard <Limit>...
  • Page 169 CYLINDER AND PISTON Piston pin 1. Inspect: Piston pin Blue discoloration/grooves → Replace, then inspect the lubrication system. 2. Measure: Piston pin-to-piston clearance Measurement steps: Measure the outside diameter (piston pin) If out of specification, replace the piston pin. Outside diameter (piston pin): 17.991 ~ 18.000 mm (0.7083 ~ 0.7087 in) Measure the inside diameter (piston) b.
  • Page 170 CYLINDER AND PISTON 2. Position: Top ring 2nd ring Oil ring 45° Offset the piston ring end gaps as 135° 135° shown. a Top ring end b 2nd ring end c Oil ring end (upper) d Oil ring e Oil ring end (lower) 3.
  • Page 171: Clutch

    CLUTCH CLUTCH CLUTCH Extent of removal: 1 Push rod and push lever removal 2 Push pod 1 disassembly 3 Friction plate and clutch plate removal 4 Clutch housing removal Extent of removal Order Part name Q’ty Remarks CLUTCH REMOVAL Preparation for removal Drain the engine oil.
  • Page 172 CLUTCH Extent of removal Order Part name Q’ty Remarks Clutch plate Friction plate Use special tool. Look washer Refer to “REMOVAL POINTS”. Clutch boss Thrust washer Clutch housing Push lever 4 - 49...
  • Page 173 CLUTCH EC493000 REMOVAL POINTS EC483211 Clutch boss 1. Remove: Nut 1 Lock washer 2 Clutch boss 3 NOTE: Straighten the lock washer tab and use the clutch holding tool 4 to hold the clutch boss. Å ı Clutch holding tool: YM-91042/90890-04086 Å...
  • Page 174 CLUTCH EC484500 Friction plate 1. Measure: Friction plate thickness Out of specification → Replace friction plate as a set. Measure at all four points. Friction plate thickness: 2.92 ~ 3.08 mm (0.115 ~ 0.121 in) <Limit>: 2.8 mm (0.110 in) EC484600 Clutch plate 1.
  • Page 175 CLUTCH EC4A5000 ASSEMBLY AND INSTALLATION Push lever 1. Install: Push lever 1 Bolt (push lever) 10 Nm (1.0 m · kg, 7.2 ft · lb) NOTE: Apply the lithium soap base grease on the oil seal lip. Apply the engine oil on the push lever. Fit the seat plate 2 in the groove a of the push lever and tighten the bolt (seat plate).
  • Page 176 CLUTCH 3. Bend the lock washer 1 tab. 4. Install: Friction plate 1 Clutch plate 2 NOTE: Install the clutch plates and friction plates alternately on the clutch boss, starting with a friction plate and ending with a friction plate. Apply the engine oil on the friction plates and clutch plates.
  • Page 177 CLUTCH 8. Install: Clutch spring Bolt (clutch spring) 8 Nm (0.8 m · kg, 5.8 ft · lb) NOTE: Tighten the bolts in stage, using a crisscross pattern. 9. Install: Gasket (clutch cover) 1 Dowel pin 2 10. Install: Clutch cover 1 Bolt (clutch cover) 10 Nm (1.0 m ·...
  • Page 178: Oil Filter, Water Pump And Crankcase Cover (Right)

    OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT) OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT) OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT) Extent of removal: 1 Oil filter removal 2 Water pump removal 3 Crankcase cover (right) removal Extent of removal Order Part name...
  • Page 179 OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT) Extent of removal Order Part name Q’ty Remarks Oil hose Kickstarter Crankcase cover (right) Gasket Dowel pin/O-ring Impeller Plain washer Impeller shaft Refer to “REMOVAL POINTS”. Oil seal 1 Oil seal 2 Bearing 4 - 56...
  • Page 180 OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT) REMOVAL POINTS EC4G3110 Impeller shaft 1. Remove: Impeller 1 Plain washer 2 Impeller shaft 3 NOTE: Hold the impeller shaft on its width across the flats a with spanners, etc. and remove the impeller.
  • Page 181 OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT) EC4H4600 Bearing 1. Inspect: Bearing Rotate inner race with a finger. Rough spot/seizure → Replace. EC444400 Oil seal 1. Inspect: Oil seal Wear/damage → Replace. ASSEMBLY AND INSTALLATION EC4G5110 Oil seal 1. Install: Oil seal 1 NOTE: Apply the lithium soap base grease on the oil...
  • Page 182 OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT) EC4G5220 Impeller shaft 1. Install: Impeller shaft 1 Plain washer 2 Impeller 3 14 Nm (1.4 m · kg, 10 ft · lb) NOTE: Take care so that the oil seal lip is not dam- aged or the spring does not slip off its posi- tion.
  • Page 183 OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT) Kick crank 1. Install: Kickstarter 1 Plain washer Bolt (kickstarter) 33 Nm (3.3 m · kg, 24 ft · lb) NOTE: Install the kickstarter so that the distance a between the kickstarter and the fuel tank is 12 mm (0.47 in) or more.
  • Page 184 OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT) 2. Install: Water pump housing 1 Bolt (water pump housing) 2 10 Nm (1.0 m · kg, 7.2 ft · lb) Plain washer 3 Coolant drain bolt 4 10 Nm (1.0 m · kg, 7.2 ft · lb) 3.
  • Page 185: Balancer

    BALANCER BALANCER BALANCER Extent of removal: 1 Balancer drive gear 2 Balancer Extent of removal Order Part name Q’ty Remarks BALANCER REMOVAL Preparation for removal Clutch housing Refer to “CLUTCH” section. Crankcase cover (right) Refer to “OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT)”...
  • Page 186 BALANCER REMOVAL POINTS Balancer drive gear and balancer driven gear 1. Straighten the lock washer tab. 2. Loosen: Nut (primary drive gear) 1 Nut (balancer) 2 NOTE: Place an aluminum plate a between the teeth of the balancer drive gear 3 and driven gear Balancer 1.
  • Page 187 BALANCER ASSEMBLY AND INSTALLATION Balancer, balancer drive gear and balancer driven gear 1. Install: Balancer 1 NOTE: When installing the balancer shaft, align the center of the balancer shaft weight a along the line connecting the centers of the crank- shaft and balancer shaft.
  • Page 188: Oil Pump

    OIL PUMP OIL PUMP OIL PUMP Extent of removal: 1 Oil pump removal 2 Oil pump disassembly Extent of removal Order Part name Q’ty Remarks OIL PUMP REMOVAL AND DIS- ASSEMBLY Preparation for removal Clutch housing Refer to “CLUTCH” section. Crankcase cover (right) Refer to “OIL FILTER, WATER PUMP AND CRANKCASE COVER (RIGHT)”...
  • Page 189 OIL PUMP Extent of removal Order Part name Q’ty Remarks Washer Oil pump drive shaft Rotor housing 4 - 66...
  • Page 190 OIL PUMP INSPECTION Oil pump 1. Inspect: Oil pump drive gear Oil pump driven gear Rotor housing Oil pump cover Cracks/wear/damage → Replace. 2. Measure: Tip clearance a Between the inner rotor 1 and the outer rotor 2. Tip clearance b Between the outer rotor 2 and the rotor housing 3.
  • Page 191 OIL PUMP 2. Install: Outer rotor 1 1 NOTE: Apply the engine oil on the outer rotor 1. 3. Install: Oil pump cover 1 Screw (oil pump cover) 2 2 Nm (0.2 m · kg, 1.4 ft · lb) Pin 3 Inner rotor 2 4 Circlip 5 NOTE:...
  • Page 192: Kick Axle And Shift Shaft

    KICK AXLE AND SHIFT SHAFT KICK AXLE AND SHIFT SHAFT KICK AXLE AND SHIFT SHAFT Extent of removal: 1 Kick axle removal 2 Kick axle disassembly 3 Shift shaft removal 4 Segment removal Extent of removal Order Part name Q’ty Remarks KICK AXLE AND SHIFT SHAFT REMOVAL...
  • Page 193 KICK AXLE AND SHIFT SHAFT Extent of removal Order Part name Q’ty Remarks Roller Shift guide Refer to “REMOVAL POINTS”. Shift lever assembly Shift lever Pawl Pawl pin Spring Bolt (stopper lever) Stopper lever Torsion spring Segment Refer to “REMOVAL POINTS”. 4 - 70...
  • Page 194 KICK AXLE AND SHIFT SHAFT REMOVAL POINTS EC4B3101 Kick axle assembly 1. Remove: Kick axle assembly 1 NOTE: Unhook the torsion spring 2 from the hole a in the crankcase. EC4C3101 Shift guide and shift lever assembly 1. Remove: Bolt (shift guide) Shift guide 1 Shift lever assembly 2 NOTE:...
  • Page 195 KICK AXLE AND SHIFT SHAFT EC4B4400 Shift shaft 1. Inspect: Shift shaft 1 Bend/damage → Replace. Spring 2 Broken → Replace. EC4C4100 Shift guide and shift lever assembly 1. Inspect: Shift guide 1 Shift lever 2 Pawl 3 Pawl pin 4 Spring 5 Wear/damage →...
  • Page 196 KICK AXLE AND SHIFT SHAFT EC4B5111 Stopper lever 1. Install: Torsion spring 1 Stopper lever 2 Bolt (stopper lever) 3 10 Nm (1.0 m · kg, 7.2 ft · lb) NOTE: Align the stopper lever roller with the slot on segment.
  • Page 197 KICK AXLE AND SHIFT SHAFT EC4C5301 Shift shaft 1. Install: Roller 1 Collar 2 Torsion spring 3 Shift shaft 4 NOTE: Apply the engine oil on the roller and shift shaft. 2. Install: Shift pedal Refer to “AC MAGNETO AND STARTER CLUTCH”...
  • Page 198 KICK AXLE AND SHIFT SHAFT 3. Install: Spring guide 1 NOTE: Slide the spring guide into the kick axle, make sure the groove a in the spring guide fits on the stopper of the torsion spring. 4. Install: Kick axle assembly 1 Plain washer 2 NOTE: Apply the molybdenum disulfide grease on...
  • Page 199: Ac Magneto And Starter Clutch

    AC MAGNETO AND STARTER CLUTCH AC MAGNETO AND STARTER CLUTCH Extent of removal: 1 Starter clutch/wheel gear removal 2 Rotor removal 3 Pickup coil/stator removal Extent of removal Order Part name Q’ty Remarks AC MAGNETO AND STATOR REMOVAL Preparation for removal Drain the engine oil.
  • Page 200 AC MAGNETO AND STARTER CLUTCH Extent of removal Order Part name Q’ty Remarks Dowel pin Idle gear 2 Bearing Shaft Nut (rotor) Refer to NOTE. Rotor Use special tool. Refer to “REMOVAL POINTS”. Woodruff key Starter clutch Starter clutch drive gear Bearing Plain washer Holder...
  • Page 201 AC MAGNETO AND STARTER CLUTCH EC4L3000 REMOVAL POINTS Rotor 1. Remove: Nut (rotor) 1 Plain washer 2. Remove: Rotor 1 Use the rotor puller 2. Rotor puller: YM-04141/90890-04141 EC4L4000 INSPECTION AC magneto 1. Inspect: Rotor inner surface a Stator outer surface b Damage →...
  • Page 202 AC MAGNETO AND STARTER CLUTCH Starter clutch 1. Check: Starter clutch Damage/wear → Replace. 2. Check: Idle gear Idle gear shaft Starter clutch gear → Pitting/burrs/chips/roughness/wear Replace the defective parts. 3. Check: Starter clutch operation Install the starter clutch drive gear 1 onto the starter clutch 2 and hold the starter clutch.
  • Page 203 Take care not to catch the AC magneto lead between crankcase cover ribs. Apply the sealant to the grommet of the AC magneto lead.  Quick gasket ACC-QUICK-GS-KT YAMAHA Bond No. 1215: 90890-85505 3. Install: Plain washer 1 Bearing 2 Starter clutch drive gear 3 Starter clutch 4...
  • Page 204 AC MAGNETO AND STARTER CLUTCH 5. Install: Bolt (starter clutch) 1 16 Nm (1.6 m · kg, 11 ft · lb) Plain washer (rotor) Nut (rotor) 2 65 Nm (6.5 m · kg, 47 ft · lb) NOTE: Tighten the rotor nut to 65 Nm (6.5 m·kg, 47 ft·lb), loosen and retighten the rotor nut to 65 Nm (6.5 m·kg, 47 ft·lb).
  • Page 205 AC MAGNETO AND STARTER CLUTCH 10. Install: Engine guard 1 Clamp 2 Bolt [engine guard (front)] 3 34 Nm (3.4 m · kg, 24 ft · lb) Bolt [engine guard (rear)] 4 23 Nm (2.3 m · kg, 17 ft · lb) Cylinder head breather hose 5 11.
  • Page 206: Engine Removal

    ENGINE REMOVAL EC4M0000 ENGINE REMOVAL Extent of removal Order Part name Q’ty Remarks ENGINE REMOVAL Preparation for removal Hold the machine by placing the WARNING suitable stand under the frame. Support the machine securely so there is no danger of it falling over. Drain the engine oil Refer to “ENGINE OIL REPLACEMENT”...
  • Page 207 ENGINE REMOVAL Extent of removal: 1 Engine removal Extent of removal Order Part name Q’ty Remarks Crankcase cover (left) Refer to “AC MAGNETO AND STARTER CLUTCH” section for remov- ing the starter motor lead. Disconnect the starter motor Refer to “ELECTRIC STARTING SYS- lead.
  • Page 208 ENGINE REMOVAL Extent of removal Order Part name Q’ty Remarks Engine upper bracket (right) Engine upper bracket (left) Engine lower bracket Engine mounting bolt Pivot shaft Refer to “REMOVAL POINTS”. Engine 4 - 85...
  • Page 209 ENGINE REMOVAL EC4M3000 REMOVAL POINTS EC4F3100 Drive sprocket 1. Remove: Nut (drive sprocket) 1 Lock washer 2 NOTE: Straighten the lock washer tab. Loosen the nut while applying the rear brake. 2. Remove: Drive sprocket 1 Drive chain 2 NOTE: Remove the drive sprocket together with the drive chain.
  • Page 210 ENGINE REMOVAL EC4M5000 ASSEMBLY AND INSTALLATION Engine installation 1. Install: Engine 1 Install the engine from right side. Pivot shaft 2 85 Nm (8.5 m · kg, 61 ft · lb) Engine mounting bolt (lower) 3 69 Nm (6.9 m · kg, 50 ft · lb) Engine lower bracket 4 Bolt (engine bracket) 5 34 Nm (3.4 m ·...
  • Page 211 ENGINE REMOVAL Drive sprocket 1. Install: Drive sprocket 1 Drive chain 2 NOTE: Install the drive sprocket together with the drive chain. 2. Install: Lock washer 1 Nut (drive sprocket) 2 75 Nm (7.5 m · kg, 54 ft · lb) NOTE: Tighten the nut while applying the rear brake.
  • Page 212: Crankcase And Crankshaft

    CRANKCASE AND CRANKSHAFT CRANKCASE AND CRANKSHAFT CRANKCASE AND CRANKSHAFT Extent of removal: 1 Crankcase separation 2 Crankshaft removal Extent of removal Order Part name Q’ty Remarks CRANKCASE SEPARATION Preparation for removal Engine Refer to “ENGINE REMOVAL” section. Piston Refer to “CYLINDER AND PISTON” sec- tion.
  • Page 213 CRANKCASE AND CRANKSHAFT Extent of removal Order Part name Q’ty Remarks Oil strainer Oil delivery pipe 2 Crankshaft Use special tool. Refer to “REMOVAL POINTS”. 4 - 90...
  • Page 214: Transmission, Shift Cam And Shift Fork

    CRANKCASE AND CRANKSHAFT CRANKCASE BEARING Extent of removal: 1 Crankcase bearing removal Extent of removal Order Part name Q’ty Remarks CRANKCASE BEARING REMOVAL Preparation for removal Transmission Refer to “TRANSMISSION, SHIFT Shift cam and shift fork CAM AND SHIFT FORK” section. Oil seal Bearing Refer to “REMOVAL POINTS”.
  • Page 215 CRANKCASE AND CRANKSHAFT REMOVAL POINTS Crankcase 1. Separate: Crankcase (right) Crankcase (left) Separation steps: Remove the crankcase bolts, hose guide and clutch cable holder. NOTE: Loosen each bolt 1/4 of a turn at a time and after all the bolts are loosened, remove them.
  • Page 216 CRANKCASE AND CRANKSHAFT Crankshaft 1. Remove: Crankshaft 1 Use the crankcase separating tool 2. Crankcase separating tool: YU-1135-A/90890-01135 CAUTION: Do not use a hammer to drive out the crankshaft. Crankshaft bearing 1. Remove: Bearing 1 NOTE: Remove the bearing from the crankcase by pressing its inner race.
  • Page 217 CRANKCASE AND CRANKSHAFT EC4N4201 Crankshaft 1. Measure: Runout limit a Small end free play limit b Connecting rod big end side clearance Crank width d Out of specification → Replace. Use the dial gauge and a thickness gauge. Dial gauge and stand: YU-3097/90890-01252 Standard <Limit>...
  • Page 218 CRANKCASE AND CRANKSHAFT EC4N5000 ASSEMBLY AND INSTALLATION Crankshaft bearing 1. Install: Bearing Bearing stopper Bolt (bearing stopper) 10 Nm (1.0 m · kg, 7.2 ft · lb) Screw (bearing stopper) 10 Nm (1.0 m · kg, 7.2 ft · lb) Screw [bearing stopper (crankshaft)] 1 10 Nm (1.0 m ·...
  • Page 219 10 Nm (1.0 m · kg, 7.2 ft · lb) 4. Apply: Sealant On the crankcase (right) 1. ® Quick gasket ACC-QUICK-GS-KT YAMAHA Bond No. 1215: 90890-85505 NOTE: Clean the contacting surface of crankcase (left and right) before applying the sealant. 4 - 96...
  • Page 220 CRANKCASE AND CRANKSHAFT 5. Install: Dowel pin 1 O-ring 2 Crankcase (right) To crankcase (left). NOTE: Fit the crankcase (right) onto the crankcase (left). Tap lightly on the case with soft ham- mer. When installing the crankcase, the connect- ing rod should be positioned at TDC (top dead center).
  • Page 221 TRANSMISSION, SHIFT CAM AND SHIFT FORK TRANSMISSION, SHIFT CAM AND SHIFT FORK TRANSMISSION, SHIFT CAM AND SHIFT FORK Extent of removal: 1 Shift fork, shift cam, main axle and drive axle removal Extent of removal Order Part name Q’ty Remarks TRANSMISSION, SHIFT CAM AND SHIFT FORK REMOVAL Preparation for removal...
  • Page 222 TRANSMISSION, SHIFT CAM AND SHIFT FORK EC4H3000 REMOVAL POINTS Shift fork, shaft cam and transmission 1. Remove: Shift forks Shift cam Main axle Drive axle NOTE: Tap lightly on the transmission drive axle and shift cam with a soft hammer to remove. Remove assembly carefully.
  • Page 223 TRANSMISSION, SHIFT CAM AND SHIFT FORK EC4H4801 Shift fork, shift cam and segment 1. Inspect: Shift fork 1 Wear/damage/scratches → Replace. 2. Inspect: Shift cam 1 Segment 2 Bend/wear/damage → Replace. 3. Check: Shift fork movement Unsmooth operation → Replace shift fork.
  • Page 224 TRANSMISSION, SHIFT CAM AND SHIFT FORK 2. Install: 2nd wheel gear (26T) 1 4th wheel gear (21T) 2 3rd wheel gear (21T) 3 5th wheel gear (21T) 4 1st wheel gear (29T) 5 O-ring 6 To drive axle 7. NOTE: Apply the molybdenum disulfide oil on the 1st, 2nd and 3rd wheel gears inner circum- ference and on the end surface.
  • Page 225 TRANSMISSION, SHIFT CAM AND SHIFT FORK 5. Install: Shift fork 1 (L) 1 Shift fork 2 (C) 2 Shift fork 3 (R) 3 Shift cam 4 To main axle and drive axle. NOTE: Apply the molybdenum disulfide oil on the shift fork grooves.
  • Page 226: Chassis

    CHAS FRONT WHEEL AND REAR WHEEL EC500000 CHASSIS EC590000 FRONT WHEEL AND REAR WHEEL EC598000 FRONT WHEEL Extent of removal: 1 Front wheel removal 2 Wheel bearing removal 3 Brake disc removal Extent of removal Order Part name Q’ty Remarks FRONT WHEEL REMOVAL WARNING Preparation for removal...
  • Page 227 CHAS FRONT WHEEL AND REAR WHEEL EC598100 REAR WHEEL Extent of removal: 1 Rear wheel removal 2 Wheel bearing removal 3 Brake disc removal Extent of removal Order Part name Q’ty Remarks REAR WHEEL REMOVAL WARNING Preparation for removal Hold the machine by placing the Support the machine securely so there is no suitable stand under the engine.
  • Page 228 CHAS FRONT WHEEL AND REAR WHEEL EC593000 REMOVAL POINTS EC523101 Rear wheel 1. Remove: Wheel 1 NOTE: Push the wheel forward and remove the drive chain 2 . EC513201 Wheel bearing (if necessary) 1. Remove: Bearing 1 NOTE: Remove the bearing using a general bearing puller 2 .
  • Page 229 CHAS FRONT WHEEL AND REAR WHEEL EC514200 Wheel axle 1. Measure: Wheel axle bends Out of specification → Replace. Use the dial gauge 1. Wheel axle bending limit: 0.5 mm (0.020 in) NOTE: The bending value is shown by one half of the dial gauge reading.
  • Page 230 CHAS FRONT WHEEL AND REAR WHEEL EC595000 ASSEMBLY AND INSTALLATION Front wheel 1. Install: Bearing (left) 1 Spacer 2 Bearing (right) 3 Oil seal 4 NOTE: Apply the lithium soap base grease on the bearing and oil seal lip when installing. Use a socket that matches the outside diam- eter of the race of the bearing.
  • Page 231 CHAS FRONT WHEEL AND REAR WHEEL 5. Install: Wheel NOTE: Install the brake disc 1 between the brake pads 2 correctly. Make sure that the projections a in the trip meter gear unit fits over the stopper b on the front fork outer tube. 6.
  • Page 232 CHAS FRONT WHEEL AND REAR WHEEL 8. Tighten: Bolt (axle holder) 1 23 Nm (2.3 m · kg, 17 ft · lb) NOTE: Before tightening the bolt, fit the wheel axle to the axle holder by stroking the front fork sev- eral times with the front brake applied.
  • Page 233 CHAS FRONT WHEEL AND REAR WHEEL Rear wheel 1. Install: Bearing (right) 1 Circlip 2 Spacer 3 Bearing (left) 4 Oil seal 5 NOTE: Apply the lithium soap base grease on the bearing and oil seal lip when installing. Install the bearing with seal facing outward. Use a socket that matches the outside diam- eter of the race of the bearing.
  • Page 234 CHAS FRONT WHEEL AND REAR WHEEL 4. Install: Collar 1 NOTE: Apply the lithium soap base grease on the oil seal lip. 5. Install: Wheel NOTE: Install the brake disc 1 between the brake pads 2 correctly. 6. Install: Drive chain 1 NOTE: Push the wheel 2 forward and install the drive chain.
  • Page 235 CHAS FRONT WHEEL AND REAR WHEEL 9. Adjust: Drive chain slack a Drive chain slack: 40 ~ 50 mm (1.6 ~ 2.0 in) Refer “DRIVE CHAIN SLACK ADJUSTMENT” section in the CHAP- TER 3. 10. Tighten: Nut (wheel axle) 1 125 Nm (12.5 m ·...
  • Page 236: Front Brake And Rear Brake

    CHAS FRONT BRAKE AND REAR BRAKE EC5A0000 FRONT BRAKE AND REAR BRAKE EC5A8000 FRONT BRAKE Extent of removal: 1 Brake hose removal 2 Caliper removal 3 Master cylinder removal Extent of removal Order Part name Q’ty Remarks FRONT BRAKE REMOVAL WARNING Preparation for removal Hold the machine by placing the...
  • Page 237 CHAS FRONT BRAKE AND REAR BRAKE EC5A8100 REAR BRAKE Extent of removal: 1 Master cylinder removal 2 Brake hose removal 3 Caliper removal Extent of removal Order Part name Q’ty Remarks REAR BRAKE REMOVAL WARNING Preparation for removal Hold the machine by placing the Support the machine securely so there is no suitable stand under the engine.
  • Page 238 CHAS FRONT BRAKE AND REAR BRAKE EC5A8200 CALIPER DISASSEMBLY Å Front ı Rear Extent of removal: 1 Front caliper disassembly 2 Rear caliper disassembly Extent of removal Order Part name Q’ty Remarks CALIPER DISASSEMBLY Pad pin Brake pad Pad support Caliper piston Dust seal Refer to “REMOVAL POINTS”.
  • Page 239 CHAS FRONT BRAKE AND REAR BRAKE EC5A8300 MASTER CYLINDER DISASSEMBLY Å Front ı Rear Extent of removal: 1 Front master cylinder disassembly 2 Rear master cylinder disassembly Extent of removal Order Part name Q’ty Remarks MASTER CYLINDER DISAS- SEMBLY Master cylinder cap Diaphragm Master cylinder boot Circlip...
  • Page 240 CHAS FRONT BRAKE AND REAR BRAKE EC5A3000 Å REMOVAL POINTS Brake fluid 1. Remove: [Front] Master cylinder cap 1 [Rear] Master cylinder cap 1 Protector NOTE: Do not remove the diaphragm. ı Å Front ı Rear 2. Connect the transparent hose 2 to the bleed screw 1 and place a suitable con- tainer under its end.
  • Page 241 CHAS FRONT BRAKE AND REAR BRAKE EC533402 Å Piston seal kit 1. Remove: Dust seal 1 Piston seal 2 NOTE: Remove the piston seals and dust seals by pushing them with a finger. CAUTION: ACHTUNG: ı Never attempt to pry out piston seals and dust seals.
  • Page 242 CHAS FRONT BRAKE AND REAR BRAKE EC534214 Å ı Caliper 1. Inspect: Caliper cylinder inner surface a Wear/score marks → Replace caliper assembly. Å Front ı Rear 2. Inspect: Caliper piston 1 Wear/score marks → Replace caliper piston assembly. WARNING Replace the piston seals and dust seals 2 whenever a caliper is disassembled.
  • Page 243 CHAS FRONT BRAKE AND REAR BRAKE 2. Install: Å Piston seal 1 Dust seal 2 WARNING Always use new piston seals and dust seals. NOTE: Fit the piston seals and dust seals onto the slot on caliper correctly. ı Å Front ı...
  • Page 244 CHAS FRONT BRAKE AND REAR BRAKE 2. Install: Copper washer 1 Union bolt 2 30 Nm (3.0 m · kg, 22 ft · lb) WARNING Always use new copper washers. CAUTION: ACHTUNG: Install the brake hose so that its pipe por- tion a directs as shown and lightly touches the projection b on the caliper.
  • Page 245 CHAS FRONT BRAKE AND REAR BRAKE 2. Install: Disc cover 1 Bolt (disc cover) 2 7 Nm (0.7 m · kg, 5.1 ft · lb) 3. Install: Caliper 1 Rear wheel 2 Refer to “FRONT WHEEL AND REAR WHEEL” section. 4.
  • Page 246 CHAS FRONT BRAKE AND REAR BRAKE 3. Install: Å ı Spring 1 To master cylinder piston 2. NOTE: Install the spring at the smaller dia. side. Å Front ı Rear 4. Install: Å [Front] Master cylinder kit 1 Plain washer 2 Circlip 3 Master cylinder boot 4 To master cylinder 5 .
  • Page 247 CHAS FRONT BRAKE AND REAR BRAKE 2. Install: Brake lever 1 Bolt (brake lever) 2 6 Nm (0.6 m · kg, 4.3 ft · lb) Nut (brake lever) 3 6 Nm (0.6 m · kg, 4.3 ft · lb) NOTE: Apply the lithium soap base grease on the brake lever sliding surface, bolt and contacting surface of the master cylinder piston.
  • Page 248 CHAS FRONT BRAKE AND REAR BRAKE 4. Install: Pin 1 Plain washer 2 Cotter pin 3 NOTE: After installing, check the brake pedal height. Refer to “REAR BRAKE ADJUSTMENT” sec- tion in the CHAPTER 3. Front brake hose 1. Install: Brake hose 1 10 Nm (1.0 m ·...
  • Page 249 CHAS FRONT BRAKE AND REAR BRAKE 4. Install: Copper washer 1 Brake hose 2 Union bolt 3 30 Nm (3.0 m · kg, 22 ft · lb) WARNING Always use new copper washers. CAUTION: ACHTUNG: Install the brake hose so that it contacts the master cylinder projection a and that its bent portion b faces downward.
  • Page 250 CHAS FRONT BRAKE AND REAR BRAKE 2. Install: Brake hose holder 1 Screw (brake hose holder) 2 1 Nm (0.1 m · kg, 0.7 ft · lb) CAUTION: ACHTUNG: After installing the brake hose holders, make sure the brake hose does not contact the spring (rear shock absorber).
  • Page 251 CHAS FRONT BRAKE AND REAR BRAKE 2. Air bleed: Brake system Refer “BRAKE SYSTEM BLEEDING” section in the CHAPTER 3. Inspect: Brake fluid level Fluid at lower level → Fill up. Refer “BRAKE FLUID LEVEL INSPECTION” section in the CHAP- TER 3.
  • Page 252: Front Fork

    CHAS FRONT FORK EC550000 FRONT FORK Extent of removal: 1 Front fork removal Extent of removal Order Part name Q’ty Remarks FRONT FORK REMOVAL WARNING Preparation for removal Hold the machine by placing the Support the machine securely so there is no suitable stand under the engine.
  • Page 253 CHAS FRONT FORK EC558000 FRONT FORK DISASSEMBLY Extent of removal: 1 Oil seal removal 2 Damper rod removal Extent of removal Order Part name Q’ty Remarks FRONT FORK DISASSEMBLY Cap bolt Refer to “REMOVAL POINTS”. Fork spring Drain the fork oil. Dust seal Stopper ring Refer to “REMOVAL POINTS”.
  • Page 254 CHAS FRONT FORK EC556000 HANDLING NOTE NOTE: The front fork requires careful attention. So it is recommended that the front fork be main- tained at the dealers. CAUTION: ACHTUNG: To prevent an accidental explosion of air, following instructions should observed: The front fork with a built-in piston rod has a very sophisticated internal con- struction and is particularly sensitive to...
  • Page 255 CHAS FRONT FORK EC553201 Inner tube 1. Remove: Dust seal 1 Stopper ring 2 Using slotted-head screwdriver. CAUTION: ACHTUNG: Take care not to scratch the inner tube. 2. Remove: Inner tube 1 Oil seal removal steps: Push in slowly a the inner tube just before it bottoms out and then pull it back quickly Repeat this step until the inner tube can be pulled out from the outer tube.
  • Page 256 CHAS FRONT FORK EC554200 Base valve 1. Inspect: Valve assembly 1 Wear/damage → Replace. O-ring 2 Damage → Replace. EC554400 Fork spring 1. Measure: Fork spring free length a Out of specification → Replace. Fork spring free length: Standard Limit 460 mm (18.1 in) 455 mm (17.9 in) EC554502...
  • Page 257 CHAS FRONT FORK EC554700 Cap bolt 1. Inspect: Cap bolt 1 O-ring 2 Air bleed screw 3 Wear/damage → Replace. EC555000 ASSEMBLY AND INSTALLATION Front fork assembly 1. Wash the all parts in a clean solvent. 2. Install: Damper rod 1 To inner tube 2.
  • Page 258 CHAS FRONT FORK 5. Install: Spring guide 1 Locknut 2 To damper rod 3. NOTE: Install the spring guide with its cut a facing upward. With its thread b facing upward, fully finger tighten the locknut onto the damper rod. 6.
  • Page 259 CHAS FRONT FORK 9. Install: Slide metal 1 Plain washer 2 To outer tube slot. NOTE: Press the slide metal into the outer tube with fork seal driver 3. Fork seal driver: YM-01442/90890-01442 10. Install: Oil seal 1 NOTE: Press the oil seal into the outer tube with fork seal driver 2.
  • Page 260 CHAS FRONT FORK 13. Check: Inner tube smooth movement Tightness/binding/rough spots → Repeat the steps 2 to 12. 14. Compress the front fork fully. 15. Fill: Front fork oil Until outer tube top surface with recom- mended fork oil 1. Recommended oil: Suspension oil “01”...
  • Page 261 CHAS FRONT FORK 19. Wait ten minutes until the air bubbles have been removed from the front fork, and the oil has dispense evenly in system before setting recommended oil level. NOTE: Fill with the fork oil up to the top end of the outer tube, or the fork oil will not spread over to every part of the front forks, thus making it impossible to obtain the correct level.
  • Page 262 CHAS FRONT FORK 21. Measure: Distance a Out of specification → Turn into the locknut. Distance a: 20 mm (0.79 in) or more Between damper rod 1 top and locknut 2 top. 22. Loosen: Rebound damping adjuster 1 NOTE: Loosen the rebound damping adjuster finger tight.
  • Page 263 CHAS FRONT FORK 26. Tighten: Cap bolt (locknut) 1 29 Nm (2.9 m · kg, 21 ft · lb) NOTE: While compressing the fork spring, set the thin type spanners 2 between the spacer 3 and spring guide 4. Hold the locknut 5 and tighten the cap bolt with specified torque.
  • Page 264 CHAS FRONT FORK 4. Tighten: Pinch bolt (handle crown) 1 23 Nm (2.3 m · kg, 17 ft · lb) Pinch bolt (under bracket) 2 20 Nm (2.0 m · kg, 14 ft · lb) CAUTION: ACHTUNG: Tighten the under bracket to specified torque.
  • Page 265: Handlebar

    CHAS HANDLEBAR EC5B0000 HANDLEBAR Extent of removal: 1 Handlebar removal Extent of removal Order Part name Q’ty Remarks HANDLEBAR REMOVAL Preparation for removal Headlight Hot starter cable Disconnect at the lever side. Hot starter lever holder Clutch cable Disconnect at the lever side. Clutch lever holder Disconnect the clutch switch lead.
  • Page 266 CHAS HANDLEBAR EC5B3000 REMOVAL POINTS EC5B3100 Master cylinder 1. Remove: Master cylinder bracket 1 Master cylinder 2 CAUTION: ACHTUNG: Do not let the master cylinder hang on the brake hose. Keep the master cylinder cap side hori- zontal to prevent air from coming in. EC5B3200 Grip 1.
  • Page 267 CHAS HANDLEBAR EC5B5000 ASSEMBLY AND INSTALLATION Handlebar 1. Install: Handlebar 1 Handlebar holder 2 Bolt (handlebar holder) 3 28 Nm (2.8 m · kg, 20 ft · lb) NOTE: The handlebar holder should be installed with the punched mark a forward. First tighten the bolts on the front side of the handlebar holder, and then tighten the bolts on the rear side.
  • Page 268 CHAS HANDLEBAR 4. Install: Cover (grip cap) 1 Throttle grip 2 NOTE: Apply the lithium soap base grease on the throttle grip sliding surface. 5. Install: Throttle cables 1 To tube guide 2 . NOTE: Apply the lithium soap base grease on the throttle cable end and tube guide cable wind- ing portion.
  • Page 269 CHAS HANDLEBAR 8. Install: Start switch 1 Master cylinder 2 Master cylinder bracket 3 Bolt (master cylinder bracket) 4 9 Nm (0.9 m · kg, 6.5 ft · lb) Clamp 5 NOTE: The start switch and master cylinder bracket should be installed according to the dimen- sions shown.
  • Page 270 CHAS HANDLEBAR 11. Install: Clutch cable 1 Hot starter cable 2 NOTE: Apply the lithium soap base grease on the clutch cable end and hot starter cable end. 12. Adjust: Clutch lever free play Refer to “CLUTCH ADJUSTMENT” section in the CHAPTER 3. Hot starter lever free play Refer to “HOT STARTER LEVER ADJUSTMENT”...
  • Page 271: Steering

    CHAS STEERING EC560000 STEERING Extent of removal: 1 Under bracket removal 2 Bearing removal Extent of removal Order Part name Q’ty Remarks STEERING REMOVAL WARNING Preparation for removal Hold the machine by placing the Support the machine securely so there is no suitable stand under the engine.
  • Page 272 CHAS STEERING Extent of removal Order Part name Q’ty Remarks Bearing (upper) Bearing (lower) Refer to “REMOVAL POINTS”. Ball race 5 - 47...
  • Page 273 CHAS STEERING EC563000 REMOVAL POINTS EC563202 Ring nut 1. Remove: Ring nut 1 Use the ring nut wrench 2. Ring nut wrench: YU-33975/90890-01403 WARNING Support the steering shaft so that it may not fall down. EC563300 Bearing (lower) 1. Remove: Bearing (lower) 1 Use the floor chisel 2.
  • Page 274 CHAS STEERING EC564101 Bearing and ball race 1. Wash the bearings and ball races with a solvent. 2. Inspect: Bearing 1 Ball race Pitting/damage → Replace bearings and ball races as a set. Install the bearing in the ball races. Spin the bearings by hand.
  • Page 275 CHAS STEERING 4. Install: Plain washer 1 Ring nut 2 7 Nm (0.7 m · kg, 5.1 ft · lb) Tighten the ring nut using the ring nut wrench 3. Refer to “STEERING HEAD INSPEC- TION AND ADJUSTMENT” section in the CHAPTER 3.
  • Page 276 CHAS STEERING 9. Install: Steering shaft cap 1 10. After tightening the nut, check the steer- ing for smooth movement. If not, adjust the steering by loosening the ring nut little by little. 11. Adjust: Front fork top end a Front fork top end (standard) a: Zero mm (Zero in) 12.
  • Page 277: Swingarm

    CHAS SWINGARM EC570000 SWINGARM Extent of removal: 1 Swingarm removal Extent of removal Order Part name Q’ty Remarks SWINGARM REMOVAL WARNING Preparation for removal Hold the machine by placing the Support the machine securely so there is no suitable stand under the engine. danger of it falling over.
  • Page 278 CHAS SWINGARM EC578000 SWINGARM DISASSEMBLY Extent of removal: 1 Swingarm disassembly 2 Connecting rod removal and disassembly 3 Relay arm removal and disassembly Extent of removal Order Part name Q’ty Remarks SWINGARM DISASSEMBLY Relay arm Connecting rod Collar Oil seal Thrust bearing Bush Oil seal...
  • Page 279 CHAS SWINGARM EC573000 REMOVAL POINTS EC573200 Bearing 1. Remove: Bearing 1 NOTE: Install the bearing by pressing its outer race. EC574010 INSPECTION Wash the bearings, bushes, collars, and cov- ers in a solvent. EC574111 Swingarm 1. Inspect: Bearing 1 Bush 2 Free play exists/unsmooth revolution/ rust →...
  • Page 280 CHAS SWINGARM EC574310 Connecting rod 1. Inspect: Bearing (polylube bearing) 1 Collar 2 Free play exists/unsmooth revolution/rust → Replace bearing and collar as a set. 2. Inspect: Bearing (polylube bearing) 1 Loss of solid lubrication → Replace. Oil seal 3 Damage →...
  • Page 281 CHAS SWINGARM 2. Install: Bearing 1 Oil seal 2 To relay arm. NOTE: Apply the molybdenum disulfide grease on the bearing when installing. Install the bearing by pressing it on the side having the manufacture’s marks or numbers. Installed depth of bearings a: 5 mm (0.20 in) 3.
  • Page 282 CHAS SWINGARM 3. Install: Collar 1 To connecting rod 2. NOTE: Apply the molybdenum disulfide grease on the collar and oil seal lips. 4. Install: Connecting rod 1 Bolt (connecting rod) 2 Plain washer 3 Nut (connecting rod) 4 80 Nm (8.0 m · kg, 58 ft · lb) To relay arm 5.
  • Page 283 CHAS SWINGARM 8. Install: Bolt (connecting rod) 1 Plain washer 2 Nut (connecting rod) 3 NOTE: Apply the molybdenum disulfide grease on the bolt. Do not tighten the nut yet. 9. Install: Bolt (rear shock absorber-relay arm) 1 Nut (rear shock absorber-relay arm) 2 53 Nm (5.3 m ·...
  • Page 284 CHAS SWINGARM 13. Install: Bolt [chain tensioner (lower)] 1 Plain washer 2 Collar 3 Chain tensioner 4 Nut [chain tensioner (lower)] 5 20 Nm (2.0 m · kg, 14 ft · lb) 14. Install: Chain support 1 Support cover 2 Bolt {chain support [r= 50 mm (1.97 in)]} Nut (chain support) 4 7 Nm (0.7 m ·...
  • Page 285: Rear Shock Absorber

    CHAS REAR SHOCK ABSORBER EC580000 REAR SHOCK ABSORBER Extent of removal: 1 Rear shock absorber removal 2 Rear shock absorber disassembly Extent of removal Order Part name Q’ty Remarks REAR SHOCK ABSORBER WARNING REMOVAL Support the machine securely so there is no Preparation for removal Hold the machine by placing the danger of it falling over.
  • Page 286 CHAS REAR SHOCK ABSORBER Extent of removal Order Part name Q’ty Remarks Disconnect the starter relay cou- pler. Starter motor lead Disconnect at the starter relay side. Locking tie Taillight coupler Starting circuit cut-off relay cou- pler Plastic band Clamp (air filter joint) Only loosening.
  • Page 287 CHAS REAR SHOCK ABSORBER Extent of removal Order Part name Q’ty Remarks Spring (rear shock absorber) Bearing Refer to “REMOVAL POINTS”. 5 - 62...
  • Page 288 1. Wear eye protection to prevent eye damage from escaping gas and/or metal chips. WARNING To dispose of a damaged or worn-out shock absorber, take the unit to your Yamaha dealer for this disposal procedure. 5 - 63...
  • Page 289 CHAS REAR SHOCK ABSORBER EC583000 REMOVAL POINTS EC583320 Bearing 1. Remove: Stopper ring (upper bearing) 1 NOTE: Press in the bearing while pressing its outer race and remove the stopper ring. 2. Remove: Upper bearing 1 NOTE: Remove the bearing by pressing its outer race. 3.
  • Page 290 CHAS REAR SHOCK ABSORBER EC585000 ASSEMBLY AND INSTALLATION EC585300 Bearing 1. Install: Upper bearing 1 NOTE: Install the bearing parallel until the stopper ring groove appears by pressing its outer race. CAUTION: ACHTUNG: Do not apply the grease on the bearing outer race because it will wear the rear shock absorber surface on which the bear- ing is press fitted.
  • Page 291 CHAS REAR SHOCK ABSORBER 2. Tighten: Adjuster 1 3. Adjust: Spring length (installed) a Spring length (installed) a: Standard Extent of length adjustment 246 mm (9.69 in) 240.5 ~ 258.5 mm * 246.5 mm (9.70 in) (9.47 ~ 10.18 in) * For EUROPE, AUS, NZ and ZA NOTE: The length of the spring (installed) changes...
  • Page 292 CHAS REAR SHOCK ABSORBER 2. Install: Bush 1 Collar 2 Dust seal 3 NOTE: Apply the molybdenum disulfide grease on the bearing. Apply the lithium soap base grease on the bush, collars and dust seals. Install the dust seals with their lips facing outward.
  • Page 293 CHAS REAR SHOCK ABSORBER 8. Install: Plastic band 1 Starting circuit cut-off relay coupler 2 Taillight coupler 3 Locking tie 4 5 - 68...
  • Page 294: Electrical Components And Wiring Diagram

    – ELEC ELECTRICAL COMPONENTS AND WIRING DIAGRAM EC600000 ELECTRICAL EC610000 ELECTRICAL COMPONENTS AND WIRING DIAGRAM EC611000 ELECTRICAL COMPONENTS 1 Headlight 0 Taillight COLOR CODE B/W....Black/White 2 “ENGINE STOP” A Neutral switch B.......Black L/B ....Blue/Black button B Starter motor Br .....Brown L/R ....
  • Page 295: Map-Controlled Cdi Unit

    – ELEC MAP-CONTROLLED CDI UNIT MAP-CONTROLLED CDI UNIT A map-controlled, CDI ignition system is used in the WR450F. The microcomputer in the CDI unit detects the engine speed and throttle position, thus determining the optimum ignition timing through the entire operating range. In this way, quick throttle response can be achieved according to various riding conditions.
  • Page 296: Ignition System

    – ELEC IGNITION SYSTEM EC620000 IGNITION SYSTEM INSPECTION STEPS Use the following steps for checking the possibility of the malfunctioning engine being attributable to ignition system failure and for checking the spark plug which will not spark. No good Replace fuse and *1 Check fuse.
  • Page 297 – ELEC IGNITION SYSTEM SPARK GAP TEST Å 1. Disconnect the ignition coil from spark plug. 2. Remove the ignition coil cap. 3. Connect the dynamic spark tester 1 (ignition checker 2) as shown. Ignition coil 3 Spark plug 4 Å...
  • Page 298 – ELEC IGNITION SYSTEM MAIN SWITCH INSPECTION 1. Inspect: Main switch conduct Tester (+) lead → Red lead 1 Tester (–) lead → Brown lead 2 Tester selector position Ω × 1 Continuous while the main switch is moved to “OFF”...
  • Page 299 – ELEC IGNITION SYSTEM 3. Inspect: Secondary coil resistance Out of specification → Replace. Tester (+) lead → Orange lead 1 Tester (–) lead → Spark plug terminal 2 Secondary coil Tester selector resistance position 4.6 ~ 6.8 kΩ at kΩ...
  • Page 300: Electric Starting System

    – ELEC ELECTRIC STARTING SYSTEM ELECTRIC STARTING SYSTEM STARTING CIRCUIT CUT-OFF SYSTEM OPERATION If the main switch is set to “ON”, the starter motor can only operate if at least one of the following conditions is met: The transmission is in neutral (the neutral switch is closed).
  • Page 301 – ELEC ELECTRIC STARTING SYSTEM INSPECTION STEPS If the starter motor will not operate, use the following inspection steps. No good Replace fuse and *1 Check fuse check wire harness. No good *2 Check battery Recharge or replace. No good Check each coupler and Repair or replace.
  • Page 302 – ELEC ELECTRIC STARTING SYSTEM EC624000 COUPLERS AND LEADS CONNECTION INSPECTION 1. Check: Couplers and leads connection Rust/dust/looseness/short-circuit → Repair or replace. STARTER MOTOR OPERATION 1. Connect the positive battery terminal 1 and starter motor lead 2 with a jumper lead 3.
  • Page 303 – ELEC ELECTRIC STARTING SYSTEM STARTER RELAY INSPECTION 1. Remove: Starter relay 2. Inspect: Starter relay conduct Use 12 V battery. Battery (+) lead → Starter relay terminal 1 Battery (–) lead → Starter relay terminal 2 Tester (+) lead → Starter relay terminal 3 Tester (–) lead →...
  • Page 304 – ELEC ELECTRIC STARTING SYSTEM DIODE INSPECTION 1. Remove the diode from wire harness. 2. Inspect: Diode continuity Use pocket tester (tester selection posi- tion Ω × 1) Tester (+) → Blue/Red terminal 1 Continuous Tester (–) → Sky blue terminal 2 Tester (+) →...
  • Page 305 – ELEC ELECTRIC STARTING SYSTEM STARTER MOTOR Extent of removal: 1 Starter motor disassembly Extent of removal Order Part name Q’ty Remarks STARTER MOTOR REMOVAL Preparation for removal Drain the engine oil. Refer to “ENGINE OIL REPLACEMENT” section in the CHAPTER 3. Crankcase cover (left) Refer “AC...
  • Page 306 – ELEC ELECTRIC STARTING SYSTEM Extent of removal Order Part name Q’ty Remarks Starter motor yoke Armature assembly Starter motor rear cover Brush Brush spring 6 - 13...
  • Page 307 – ELEC ELECTRIC STARTING SYSTEM INSPECTION AND REPAIR 1. Check: Commutator Dirt → Clean with 600 grit sandpaper. 2. Measure: Commutator diameter a Out of specification → Replace the starter motor. Min. commutator diameter 16.6 mm (0.65 in) 3. Measure: Mica undercut a Out of specification →...
  • Page 308 – ELEC ELECTRIC STARTING SYSTEM 5. Measure: Brush length a Out of specification → Replace the brushes as a set. Min. brush length 3.5 mm (0.14 in) 6. Measure: Brush spring force Out of specification → Replace the brush springs as a set. Brush spring force 3.92 ~ 5.88 N (400 ~ 600 gf, 14.1 ~ 21.2 oz)
  • Page 309 – ELEC ELECTRIC STARTING SYSTEM 3. Install: O-ring 1 Starter motor yoke 2 NOTE: Align the match mark on the starter motor yoke with the match mark b on the starter motor rear cover. Install the starter motor yoke with its groove c facing rear cover.
  • Page 310: Charging System

    – ELEC CHARGING SYSTEM EC680000 CHARGING SYSTEM EC681001 INSPECTION STEPS If the battery is not charged, use the following inspection steps. No good Replace fuse and *1 Check fuse. check wire harness. No good *2 Check battery. Recharge or replace. No good Check each coupler and Repair or replace.
  • Page 311 – ELEC CHARGING SYSTEM EC624000 COUPLERS AND LEADS CONNECTION INSPECTION 1. Check: Couplers and leads connection Rust/dust/looseness/short-circuit → Repair or replace. CHARGING VOLTAGE INSPECTION 1. Start the engine. 2. Inspect: Charging voltage Out of specification → If no failure is found in checking the source coil resis- tance, replace the rectifier/regulator.
  • Page 312: Tps (Throttle Position Sensor) System

    – ELEC TPS (THROTTLE POSITION SENSOR) SYSTEM EC690000 TPS (THROTTLE POSITION SENSOR) SYSTEM INSPECTION STEPS If the TPS will not operate, use the following inspection steps. No good Check entire ignition Repair or replace. system for connection. No good Check TPS. TPS coil Replace.
  • Page 313 – ELEC TPS (THROTTLE POSITION SENSOR) SYSTEM HANDLING NOTE CAUTION: Do not loosen the screws {TPS (throttle position sensor)} 1 except when changing the TPS (throttle position sensor) due to failure because it will cause a drop in engine performance. EC624000 COUPLERS AND LEADS CONNECTION INSPECTION...
  • Page 314 – ELEC TPS (THROTTLE POSITION SENSOR) SYSTEM 3. Inspect: TPS coil variable resistance Check that the resistance in increased as the throttle grip is moved from the full close position to the full open posi- tion. Out of specification → Replace. Tester (+) lead →...
  • Page 315 – ELEC TPS (THROTTLE POSITION SENSOR) SYSTEM 4. Adjust: Idle speed Refer to “IDLE SPEED ADJUSTMENT” section in the CHAPTER 3. 5. Insert the thin electric conductors 2 (lead) into the TPS coupler 1, as shown, and connect the tester to them. Tester (+) lead →...
  • Page 316 – ELEC TPS (THROTTLE POSITION SENSOR) SYSTEM 8. Tighten: Screw (TPS) 1 9. Stop the engine. EC694000 TPS INPUT VOLTAGE INSPECTION 1. Disconnect the TPS coupler. 2. Start the engine. 3. Inspect: TPS input voltage Out of specification → Replace the CDI unit.
  • Page 317: Lighting System

    – ELEC LIGHTING SYSTEM LIGHTING SYSTEM INSPECTION STEPS Refer to the following flow chart when inspecting the ignition system for possible problems. Check the bulb and bulb Replace the bulb and/ No good socket. or bulb socket. No good Check the lights switch. Replace.
  • Page 318 – ELEC LIGHTING SYSTEM LIGHTS SWITCH INSPECTION 1. Inspect: Lights switch conduct Tester (+) lead → Yellow lead 1 Tester (–) lead → Blue lead 2 Tester selec- tor position Ω × 1 → Replace. No continuous while being Continuous while being OFF → Replace. AC MAGNETO INSPECTION 1.
  • Page 319: Tuning

    T U N SETTING EC700000 TUNING EC710000 ENGINE Carburetor setting The air/fuel mixture will vary depending on atmospheric conditions. Therefore, it is nec- essary to take into consideration the air pres- sure, ambient temperature, humidity, etc., when adjusting the carburetor. Perform a test run to check for proper engine performance (e.g., throttle response) and spark plug(-s) discoloration or fouling.
  • Page 320 T U N SETTING CAUTION: The carburetor is extremely sensitive to foreign matter (dirt, sand, water, etc.). During installation, do not allow foreign matter to get into the carburetor. Always handle the carburetor and its components carefully. Even slight scratches, bends or damage to carbure- tor parts may prevent the carburetor from functioning correctly.
  • Page 321 T U N SETTING Effects of the setting parts on the throttle valve opening Å Closed ı Fully open Å ı 1 Pilot screw/pilot jet 2 Throttle valve cutaway 3 Jet needle 4 Main jet Main system The FLATCR carburetor has a primary main jet.
  • Page 322 T U N SETTING Pilot system The FLATCR carburetor is manufactured with a pilot screw. The pilot screw adjustment ranges from fully closed throttle to 1/4 open throttle. Main jet adjustment The richness of the air-fuel mixture at full throt- tle can be set by changing the main jet 1.
  • Page 323 T U N SETTING Pilot screw adjustment The richness of the air-fuel mixture with the throttle fully closed to 1/4 open can be set by turning the pilot screw 1. Turning in the pilot screw will make the mixture lean at low speeds, and turning it out will enrich it.
  • Page 324 T U N SETTING Pilot jet adjustment The richness of the air-fuel mixture with the throttle open 1/4 or less can be set by adjust- ing the pilot jet 1. Standard pilot jet *#48 * Except for USA Effects of adjusting the pilot jet (reference) Å...
  • Page 325 T U N SETTING Jet needle adjustment The jet needle is adjusted by changing it. OBDUT Standard jet needle *OBDUQ * Except for USA The tapered sections of all jet needles have the same starting positions, but the needles are available with different straight-portion diameters.
  • Page 326 T U N SETTING Carburetor setting parts Part name Size Part number Main jet Rich #170 4MX-14943-41 #168 4MX-14943-91 #165 4MX-14943-40 #162 4MX-14943-90 *(STD) #160 4MX-14943-39 #158 4MX-14943-89 #155 4MX-14943-38 #152 4MX-14943-88 (STD) #150 4MX-14943-37 #148 4MX-14943-87 #145 4MX-14943-36 #142 4MX-14943-86 Lean #140...
  • Page 327 T U N SETTING Examples of carburetor setting depending on symptom Symptom Setting Checking Discoloration of spark plug → At full throttle Increase main jet calibration no. Hard breathing (Gradually) If tan color, it is in good condition. Shearing noise If cannot be corrected: Whitish spark plug Clogged float valve seat...
  • Page 328: Chassis

    T U N SETTING EC720000 CHASSIS EC71P002 Selection of the secondary reduction ratio (Sprocket) Secondary Number of driven sprocket teeth reduction = Number of drive sprocket teeth ratio Standard secondary 50/14 (3.571) reduction ratio <Requirement for selection of secondary gear reduction ratio>...
  • Page 329 T U N SETTING EC72N000 Drive and driven sprockets setting parts Part name Size Part number Drive sprocket 1 (STD) 5NG-17460-00 *(STD) *14T 9383E-14215 * For CDN, EUROPE, AUS, NZ and ZA Part name Size Part number Driven sprocket 2 5GS-25448-50 *48T 5NY-25448-00...
  • Page 330 T U N SETTING EC722011 Front fork setting The front fork setting should be made depend- ing on the rider’s feeling of an actual run and the circuit conditions. The front fork setting includes the following three factors: 1. Setting of air spring characteristics Change the fork oil level.
  • Page 331 T U N SETTING EC727020 Spring preload adjustment The spring preload is adjusted by installing the adjustment washer 1 between the fork spring 2 and damper rod 3. CAUTION: Do not install three or more adjustment washers for each front fork. WARNING Always adjust each front fork to the same setting.
  • Page 332 T U N SETTING 2. Use of stiff spring Generally a stiff spring gives a stiff riding feeling. Rebound damping tends to become weaker, resulting in lack of a sense of contact with the road surface or in a vibrating handlebar. To set a stiff spring: Change the rebound damping.
  • Page 333 T U N SETTING EC72P000 Front fork setting parts Adjustment washer 1 TYPE (thickness) PART NUMBER T = 2.3 mm (0.09 in) 4SS-23364-L0 Front fork spring 2 [Equal pitch spring] I.D. SPRING SPRING TYPE MARK RATE PART NUMBER (slits) 0.380 4SS-23141-10 0.390 4SS-23141-20...
  • Page 334 T U N SETTING EC72B000 Rear suspension setting The rear suspension setting should be made depending on the rider’s feeling of an actual run and the circuit conditions. The rear suspension setting includes the fol- lowing two factors: 1. Setting of spring preload Change the set length of the spring.
  • Page 335 T U N SETTING NOTE: If the machine is new and after it is broken in, the same set length of the spring may change because of the initial fatigue, etc. of the spring. Therefore, be sure to make re- evaluation.
  • Page 336 T U N SETTING CAUTION: When using a rear cushion other than cur- rently installed, use the one whose overall length a does not exceed the standard as it may result in faulty performance. Never use one whose overall length is greater than standard.
  • Page 337 T U N SETTING EC72Q000 Rear shock absorber setting parts Rear shock spring 1 [Equal pitch spring] I.D. SPRING SPRING SPRING TYPE COLOR/ FREE RATE PART NUMBER POINT LENGTH 5UN-22212-00 Brown/1 SOFT 5UN-22212-10 Green/1 5UN-22212-20 Red/1 *STD 5UN-22212-30 Black/1 5UN-22212-40 Blue/1 5UN-22212-90 Purple/1 **STD...
  • Page 338: Suspension Setting

    T U N SETTING EC72H002 Suspension setting Front fork NOTE: If any of the following symptoms is experienced with the standard position as the base, make resetting by reference to the adjustment procedure given in the same chart. Before any change, set the rear shock absorber sunken length to the standard figure 90 ~ 100 mm (3.5 ~ 3.9 in).
  • Page 339 T U N SETTING Rear shock absorber NOTE: If any of the following symptoms is experienced with the standard position as the base, make resetting by reference to the adjustment procedure given in the same chart. Adjust the rebound damping in 2-click increments or decrements. Adjust the low compression damping in 1-click increments or decrements.
  • Page 340 YAMAHA MOTOR CO., LTD. PRINTED ON RECYCLED PAPER PRINTED IN JAPAN 2002.10-2.0×1 CR 2500 SHINGAI IWATA SHIZUOKA JAPAN...

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