Yamaha WR450FR 2003 Owner's Service Manual
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Yamaha WR450FR 2003 Owner's Service Manual

Yamaha WR450FR 2003 Owner's Service Manual

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

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Summary of Contents for Yamaha WR450FR 2003

  • Page 1 OWNER’S SERVICE MANUAL WR450FR LIT-11626-16-43 5TJ-28199-10...
  • Page 2 EC090000 INDEX GENERAL INFORMATION INFO SPECIFICATIONS SPEC REGULAR INSPECTION AND INSP ADJUSTMENTS ENGINE CHASSIS CHAS – ELECTRICAL ELEC TUNING...

  • Page 3: 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 4 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 5 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 6: 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 7: 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 8: 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 9 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 10 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 11: 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 12: 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 13 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 14 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 15: 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 16 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 17 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 18 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 19: 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 20: 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 21 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 22 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 23 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 24: 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 25: 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 26 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 27: 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) Overall height 1,303 mm (51.3 in)

  • Page 28: Chassis

    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 29: Electrical

    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 30 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 31 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 32 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 33 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 34 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 35 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 36 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 37 Download the full PDF manual instantly. Our customer service e-mail: aservicemanualpdf@yahoo.com...

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