Sym JET 4 R 50 Series Service Manual
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Sym JET 4 R 50 Series Service Manual

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  • Page 2 FORWARD This service manual contains the technical data of each component inspection and repair for the SYM JET 4 R 50 series scooter. The manual is shown with illustrations and focused on “Service Procedures”, “Operation Key Points”, and “Inspection Adjustment” so that provides technician with service guidelines.
  • Page 3 HOW TO USE THIS MANUAL This service manual describes basic information of different system parts and system inspection & service for JET 4 R 50 scooters. In addition, please refer to the manual contents in detailed for the model you serviced in inspection and adjustment.
  • Page 4 CONTENTS CONTENTS GENERAL INFORMATION/TROUBLE DIAGNOSIS ........1 SERVICE MAINTENANCE INFORMATION ..........2 LUBRICATION SYSTEM ................3 FUEL SYSTEM....................4 ENGINE REMOVAL ..................5 CYLINDER HEAD/ CYLINDER/PISTON ............6 ALTERNATOR ....................7 "V" TYPE BELT ....................8 FINAL DRIVING MECHANISM ..............9 CRANKCASE SHAFT ...................10 BODY COVER....................11 BRAKE SYSTEM ..................12 STEERING/FRONT WHEEL/FRONT SHOCK ABSORBER ......13 REAR WHEEL/ REAR SHOCK ABSORBER..........14 ELECTRICAL EQUIPMENT................15...
  • Page 5 MECHANISM ILLUSTRATIONS Fuel tank/oil cap Front turn Fuse &C.D.I Battery signal light Front light/ Position light Air Cleaner Kick starter pedal Side stand Engine number Storage box Frame number Tail light Main stand High& Low beam/ Turn signal/Horn switch Headlight switch /starter switch Front brake level Ignition switch...
  • Page 6 MECHANISM ILLUSTRATIONS Fuel tank/oil cap Fuse &C.D.I Battery Front turn signal light Front light/ Position light Air Cleaner Kick starter pedal Side stand Engine number Storage box Frame number Tail light Main stand High& Low beam/ Turn signal/Horn switch Headlight switch /starter switch Front brake level Ignition switch...
  • Page 7 1. GENERAL INFORMATION/TROUBLE DIAGNOSIS SYMBOLS AND MARKS ....1-1 TORQUE VALUES (ENGINE)....1-7 GENERAL SAFETY ......1-2 TORQUE VALUES (FRAME)....1-8 SERVICE PRECAUTIONS ....1-3 TROUBLES DIAGNOSIS..... 1-9 SPECIFICATIONS......1-6 LUBRICATION POINTS ...... 1-13 SYMBOLS AND MARKS Symbols and marks are used in this manual to indicate what and where the special service are needed, in case supplemental information is procedures needed for these symbols and marks, explanations will be added to the text instead of using the symbols or marks.
  • Page 8 1. GENERAL INFORMATION/TROUBLE DIAGNOSIS GENERAL SAFETY Carbon monoxide Battery If you must run your engine, ensure the place is Caution well ventilated. Never run your engine in a Battery emits explosive gases; flame is closed area. Run your engine in an open area, if strictly prohibited.
  • Page 9 1. GENERAL INFORMATION/TROUBLE DIAGNOSIS SERVICE PRECAUTIONS Always use with SANYANG genuine parts different sized fasteners, operate with a and recommended oils. Using non-designed diagonal pattern and work from inside out. parts for SANYANG motorcycle may damage Loosen the small fasteners first. If the bigger the motorcycle.
  • Page 10 1. GENERAL INFORMATION/TROUBLE DIAGNOSIS The ends of rubber hoses (for fuel, vacuum, The length of bolts and screws for or coolant) should be pushed as far as they assemblies, cover plates or boxes is different can go to their connections so that there is from one another, be sure they are correctly enough room below the enlarged ends for installed.
  • Page 11 1. GENERAL INFORMATION/TROUBLE DIAGNOSIS Note the following when routing cables and wire Harnesses: A loose wire, cable or harness may cause safety hazard. After clamping, check each wire to make sure it is secured. Do not squeeze wires against the weld or its clamp.
  • Page 12 1. GENERAL INFORMATION/TROUBLE DIAGNOSIS SPECIFICATIONS MAKER SANYANG MODEL JD05W/JE05W Overall Length 1900 mm Front TELESCOPIC FORK Overall Width 655 mm Rear UNIT SWING Overall Height 1140 mm Front 120/60-13 Wheel Base 1300 mm Rear 130/70-12 Front 43.5 kg Front DISK (ø 226 mm) Rear 69.5 kg Total...
  • Page 13 1. GENERAL INFORMATION/TROUBLE DIAGNOSIS TORQUE VALUES (ENGINE) THREAD DIA TORQUE ITEM Q'TY REMARKS (mm) VALUE(Kg-m) Cylinder head bolts 1.6~2.0 Tighten to head Crankcase flange bolt 0.8~1.2 Mission case flange bolt 2.4~3.0 Mission oil refilling bolt 1.0~1.5 Mission oil draining plug 1.0~1.5 Spark plug 1.1~1.7...
  • Page 14 1. GENERAL INFORMATION/TROUBLE DIAGNOSIS TORQUE VALUES (FRAME) THREAD DIA TORQUE ITEM Q'TY REMARKS (mm) VALUE(Kg-m) Steering handle nut 4.0~5.0kgf-m Steering stem mounting nut 1.0~1.2kgf-m Front brake caliper bolt 2.4~3.0kgf-m Front wheel axle nut 5.0~7.0kgf-m Front cushion upper 2.4~3.0kgf-m mounting nut Exhaust pipe connection nut 0.8~1.2kgf-m Exhaust muffler mounting...
  • Page 15 1. GENERAL INFORMATION/TROUBLE DIAGNOSIS TROUBLES DIAGNOSIS A. Engine hard to start or can not be started Check and adjustment Fault condition Probable causes 1. No fuel in fuel tank Loosen carburetor drain bolt 2. Check if the pipes, fuel tank to to check if there is gasoline carburetor and intake vacuum, inside the carburetor...
  • Page 16 1. GENERAL INFORMATION/TROUBLE DIAGNOSIS B. Engine run sluggish (Speed does not pick up, lack of power) Check and adjustment Fault condition Probable causes Try gradual acceleration and check engine speed 1. Air cleaner clogged 2. Poor fuel supply Engine speed can be Engine speed can not be 3.
  • Page 17 1. GENERAL INFORMATION/TROUBLE DIAGNOSIS C. Engine runs sluggish (especially in low speed and idling) Check and adjustment Fault condition Probable causes Check ignition timing (using ignition lamp) Abnormal Normal 1. Incorrect ignition timing (malfunction of CDI or AC alternator) Adjust the air screw of carburetor 1.
  • Page 18 1. GENERAL INFORMATION/TROUBLE DIAGNOSIS E. CLUTCH, DRIVING AND DRIVING PULLEY FAULT CONDITIONS PROBABLE CAUSES 1. Driving belt worn out or deformation 2. Driving disk damaged Engine can be started but 3. Driving pulley spring broken motorcycle can not be moved. 4.
  • Page 19 1. GENERAL INFORMATION/TROUBLE DIAGNOSIS LUBRICATION POINTS Seat lock Acceleration cable/ Front & rear brake lever pivot Steering shaft bearing Speedometer gear / Rear wheel bearing Side stand shaft Main stand shaft Front wheel bearing 1-13...
  • Page 20 10. Crankcase/Crankshaft Maintenance Information····················· 10-2 Crankshaft Removal ·····························10-3 Troubleshooting··································· 10-2 Crankshaft Inspection ··························10-4 Crankcase Disassembly ······················ 10-3 Crankcase Installation··························10-5 0.8~1.2kgf-m Apply sealant 10-1...
  • Page 21 10. Crankcase/Crankshaft Maintenance Information This chapter concerns disassembly of the crankcase for repair purpose. Before disassembling crankcase, except removing engine firstly, following components must be removed too. Carburetor (chapter 10) Oil pump (chapter 3) Reed valve (chapter 10) Driving belt (chapter 7) Alternator (chapter 6) Cylinder head/cylinder/piston (chapter 5) Except above components are needed be removed, when disassembling L crankcase, following...
  • Page 22 Crankcase disassemble tool crankcase with two (2) bolts, 6mm, as the diagram shown. Disassemble the right crankcase. Special Tools: Crankcase disassemble tool SYM-1120100-G5 Right crankcase Crankcase Crankshaft Removal disassemble tool As the diagram show with 2 special bolts to install the specified service tool onto the left crankcase.
  • Page 23 10. Crankcase/Crankshaft Crankshaft Inspection Measure the clearance of connecting rod big end. Measure the radial clearance of connecting rod big end at X-Y directions as diagram show. Place the crankshaft on a V-block, measure run-out points A and B of the crankshaft with dial gauge.
  • Page 24 10. Crankcase/Crankshaft Crankcase Installation Clean the crankshaft with solvent and blow it with Bearing driver 6204 compressed air. Then, check for damage or other foreign materials attached. Install new bearing into right crankcase. Caution All rotation and sliding surfaces have to be applied with clean engine oil.
  • Page 25 10. Crankcase/Crankshaft Assemble the right crankcase with assembly tools. Install right crankcase onto the crankshaft. R. Crank shaft puller Install right crankshaft puller and install bush onto R. Crank shaft crankshaft. install bush Screw the right crankshaft puller onto crankshaft. Turn the puller in C.W.
  • Page 26 11. BODY COVER MAINTENANCE INFORMATION ..11-2 FRONT CENTER COVER....11-8 HANDLE COVER....... 11-3 LUGGAGE BOX......... 11-8 FRONT COVER ......... 11-4 FLOOR PANEL........11-8 FRONT INNER BOX ......11-5 SIDE COVER ........11-9 BODY COVER/REAR CENTER UNDER COVER ......... 11-10 COVER/REAR FENDER ....11-6 R .rear mirror Handle visor...
  • Page 27 11. BODY COVER MAINTENANCE INFORMATION Body covers disassemble sequence: Front Handle cover Front wheel Luggage box & Seat Rear handle cover Front cover Rear carrier Left/right side cover Front fender Under cover Front center cover Floor panel Rear fender Front inner box Tail light Be careful not to damage various covers in disassembly or re-assembly operation.
  • Page 28 11. BODY COVER HANDLE COVER Removal: Remove 1 lower mounting screw of the handle front cover. screw ×1 Remove the mounting screws (4 screws) between the front handle cover and the rear handle cover. screws ×4 turn signal light Removed the head light wire connectors. connectors Removed the left/right turn signal light connectors.
  • Page 29 11. BODY COVER FRONT COVER Top cover Removal Remove the top cover. bolt×1 Remove the 1 mounting bolt of front cover from the frame. Screws3 × Remove the front under cover 6 mounting screws between the front under cover and the frame.
  • Page 30 11. BODY COVER Remove the 8 mounting screws between the front cover and the front inner box. screws 4 × Front cover Remove the front cover from the frame. Installation Install according to the reverse procedure of removal. FRONT INNER BOX Removal Remove the 8 mounting screws of front cover from the inner box A.
  • Page 31 11. BODY COVER Main switch cover Remove the main switch cover. 2 screws Remove the front cover and front under cover. Remove the 2 screws between the inner box and the floor panel. Remove the front inner box Installation Install the inner box A and the front inner box B according to the reverse procedure of removal.
  • Page 32 11. BODY COVER Remove the 2 mounting bolts of the rear 2 bolts fender. 2 screws Remove the 2 mounting screws between the body cover and the frame. Bolts1 × Remove the left/right side 2 mounting bolts under rear of the body cover between the body cover and the frame.
  • Page 33 11. BODY COVER FRONT CENTER COVER Removal Front center Remove the 4 screws bolt. cover Remove the front center cover. Installation Install the front center cover according to the screws×4 reverse procedure of removal. 4 bolts LUGGAGE BOX Removal Open the seat. Remove the 4 bolts from the luggage box.
  • Page 34 11. BODY COVER Remove the front cover and front under 2 screws cover. Remove the 2 mounting screws between the floor panel and the front inner box. Remove the floor panel. Installation Install the floor panel according to the reverse procedure of removal. SIDE COVER Removal Remove the left/right side 2 mounting...
  • Page 35 11. BODY COVER Bolts2 × UNDER COVER Removal Remove the floor panel. Remove the left/right side cover. Remove the left/right side 4 mounting bolts between the under cover and frame. Remove the under cover. Installation Install the under cover according to the reverse procedure of removal.
  • Page 36 12. Brake System Disc Brake System······························· 12-1 Disc Brake - Caliper ····························· 12-7 Rear Drum Brake System ···················· 12-2 Brake pad replacement························ 12-7 Maintenance Information····················· 12-3 Brake Disc············································· 12-9 Troubleshooting··································· 12-4 Disc Brake - Master Cylinder ·············· 12-9 Hydraulic Disc Brake ··························· 12-5 Rear Drum Brake··································...
  • Page 37 12. Brake System Rear Drum Brake System 11.0~13.0kgf-m 0.8~1.2kgf-m 0.8~1.2kgf-m 12-2...
  • Page 38 12. Brake System Maintenance Information Precautions in Operation Caution Inhaling brake lining ashes may cause disorders of respiration system, therefore, never use air hose or dry brush to clean brake parts. Use vacuum cleaner or other authorized tool instead. The brake caliper can be removed without removing the hydraulic system. After the hydraulic system is removed, or the brake system is felt to be too soft, bleed the hydraulic system.
  • Page 39 12. Brake System Troubleshooting Disc Brake Soft brake lever Hard operation of brake Tight brake lever 1. Air inside the hydraulic 1. Dirty brake lining/disc system 2. Poor wheel alignment 1. Blocked brake system 2. Hydraulic system leaking 3. Deformed or warped brake 2.
  • Page 40 12. Brake System Hydraulic Disc Brake Close the drain valve of the hydraulic disc brake. Replace the brake fluid. Before the brake fluid reservoir is removed, turn the handle so that the brake fluid reservoir becomes horizontal, and then remove the brake fluid reservoir.
  • Page 41 12. Brake System Disc Brake -Air Bleed Drain valve Air bubble Tightly hold the brake lever and open the drain valve around 1/4 turns, and then close the valve. Caution Do not release the brake lever before the drain valve is closed. Always check the brake fluid level when carrying out the air bleeding procedure to avoid air enters into the system.
  • Page 42 12. Brake System Disc Brake - Caliper Brake hose bolt Removal Place a container under the brake caliper, and loosen the brake hose bolt and finally remove the Caliper bolt brake hoses. Caution Do not spill brake fluid on painted surfaces. Remove two caliper bolts and the caliper.
  • Page 43 12. Brake System Install the new brake pads onto brake caliper. Install the brake pad guide pin bolts. Install the brake caliper and tighten the mounting bolts. Torque value: 2.4~3.0kgf-m Tighten the lining guide pin bolts. Torque value: 1.5~2.0kgf-m 12-8...
  • Page 44 12. Brake System Brake Disc Brake disc Inspection Visually check the brake disc for wear or break. Measure the thickness of the disc at several places. Replace the disc if it has exceeded the service limit. Micrometer Remove the brake disc from wheel. Check the disc for deformation and bend.
  • Page 45 12. Brake System Remove the rubber pad. Clip Remove the cir clip. Remove the piston and the spring. Rubber pad Clean the master cylinder with recommended brake fluid. Piston Spring Master cylinder Master Cylinder Inspection Cylinder gauge Check the master cylinder for damage or scratch. Replace it if necessary.
  • Page 46 12. Brake System Place the master cylinder onto handlebar, and install the bolts. 2 bolts Install the brake lever, and connect leads to brake Master cylinder light switch. Brake hose Connect brake hoses with 2 new washers. Tighten the brake hose bolt to the specified torque Washers value.
  • Page 47 12. Brake System Rear Drum Brake To use vacuum cleaner or other alternatives to avoid danger caused from dusts. Caution Inhaling brake lining ashes may cause disorders of respiration system, therefore, never use compressed air or dry brush to clean brake parts. Brake performance will be reduced by grease on brake lining.
  • Page 48 12. Brake System Installation Apply with a thin coat of grease to the brake cam and the anchor pin. Install brake cam. Never allow brake linings to be contaminated by oil or grease. Wipe off the excessive grease from brake cam and the anchor pin.
  • Page 49 12. Brake System Notes: 12-14...
  • Page 50 13. Steering / Front Wheel / Front Cushion Maintenance Information····················· 13-2 Front Wheel ·········································· 13-5 Troubleshooting··································· 13-2 Front Cushion······································· 13-8 Steering Handle···································· 13-3 Steering Stem ······································· 13-9 1.0~1.4kgf-m 4.0~5.0kgf-m 1.0~1.2kgf-m 2.4~3.0kgf-m 2.4~3.0kgf-m 5.0~7.0kgf-m 13-1...
  • Page 51 13. Steering / Front Wheel / Front Cushion Maintenance Information Specification Item Standard value (mm) ─ Shaft bending ─ Radial Rim wobbling ─ Axial Torque Value Steering handle nut 4.0~5.0kgf-m Brake master cylinder mounting bolts 1.0~1.4kgf-m Front wheel axle nut 5.0~7.0kgf-m Brake disc bolt 2.4~3.0kgf-m...
  • Page 52 13. Steering / Front Wheel / Front Cushion 2 bolts Steering Handle Removal Remove handle cover and front cover (refer to chapter 11). Remove front brake master cylinder (disc brake) after 2 bolts removed. 13-3...
  • Page 53 13. Steering / Front Wheel / Front Cushion Remove handle mounting bolt and nut, and then remove the handle. Installation Installs handle and align with bolt hole. Install bolt and nut and then tighten it. Torque value: 4.0~4.5kgf-m Handle mounting nut and bolt Apply with grease onto throttle cable and the Lock pin sliding surface of handle grip.
  • Page 54 13. Steering / Front Wheel / Front Cushion Front Wheel Removal Support body bottom and lift front wheel free of ground with a stand. Remove speedometer cable from speedometer gear box (1 screw). Speedometer cable Remove front wheel axle nut, and then pull out the axle and remove the wheel.
  • Page 55 13. Steering / Front Wheel / Front Cushion Place the wheel on to a rotation seat to check its rim wobbling. Turn the wheel with hand and measure its rim wobbling value with a dial gauge. Bearings replacement Remove 5 bolts and brake disc. 5 bolts Remove left side dust seal, bearing and dist.
  • Page 56 13. Steering / Front Wheel / Front Cushion 5 bolts Install the brake disc and then tighten the bolts (disc brake). Torque value: 2.4~3.0kgf-m Lubricate the speedometer gear with grease and install the gear into the wheel hub. Align the flange part on the speedometer gear with the slot of wheel hub.
  • Page 57 13. Steering / Front Wheel / Front Cushion Front Cushion Hose clamp Removal Remove front cover, front fender and front wheel. Remove the caliper mounting bolt and the caliper. Take out the hose from hose clamp. 2 bolts Brake caliper 4 bolts Remove the front cushion upper bolts and the front cushion.
  • Page 58 13. Steering / Front Wheel / Front Cushion Steering Stem Steering stem Removal mounting nut Remove steering handle, front wheel and front cushion. Remove the steering stem mounting nut. Remove top cone race and front fork. Caution Place the steel ball onto a parts container to prevent from missing.
  • Page 59 13. Steering / Front Wheel / Front Cushion Install the steering stem mounting nut and tighten Steering stem mounting nut the nut by means of holding the top cone race body. Torque value: 1.0~1.2kgf-m Install in reverse order of removal procedures. Top cone race 13-10...
  • Page 60 14. Rear Wheel / Rear Cushion Maintenance Information······················14-2 Rear Wheel·············································14-3 Troubleshooting····································14-2 Rear Cushion·········································14-5 11.0~13.0kgf-m 14-1...
  • Page 61 14. Rear Wheel / Rear Cushion Maintenance Information Specification Item Standard value (mm) Rear wheel rim run out — Torque Value Rear cushion upper mounting bolt 3.5~4.5kgf-m Rear cushion lower mounting bolt 2.4~3.0kgf-m Rear wheel nut 11.0~13.0kgf-m Bolts for the brake disc 2.4~3.0kgf-m Exhaust pipe connection nut 1.0~1.4kgf-m...
  • Page 62 14. Rear Wheel / Rear Cushion Rear Wheel Connection nuts Remove Remove exhaust pipe nut. (2 connection nuts) Remove exhaust muffler bolt (3 bolts), then Bolts remove the muffler. Shaft nut Remove rear wheel shaft nut and then remove the rear wheel.
  • Page 63 14. Rear Wheel / Rear Cushion Brake disc removal / install Shaft nut Installation Install the rear wheel and tighten the nut. Tighten torque: 11.0~13.0kgf-m 3 bolts 2 nuts Install exhaust pipe & muffler. Tighten torque (bolt): 2.4~3.0kgf-m Tighten torque (nut): 0.8~1.2kgf-m 14-4...
  • Page 64 14. Rear Wheel / Rear Cushion Upper mounting bolt Rear Cushion Removal Remove luggage box. Remove air cleaner. Remove rear cushion upper & lower bolts. Remove rear cushion. Installation Install the rear cushion. Tighten the upper & lower mounting bolts to specified torque.
  • Page 65 14. Rear Wheel / Rear Cushion Note: 14-6...
  • Page 66 16. ELECTRICAL EQUIPMENT MECHANISM DIAGRAM ....16-1 STARTING SYSTEM......16-14 PRECAUTIONS IN OPERATION ..16-2 METER ..........16-15 TROUBLE DIAGNOSIS ..... 16-4 LIGHTS/BULBS ........16-17 CHARGING SYSTEM ......16-5 SWITCH..........16-19 IGNITION SYSTEM......16-11 FUEL UNIT ......... 16-22 MECHANISM DIAGRAM Resistor Comp Reg.
  • Page 67 16. ELECTRICAL EQUIPMENT PRECAUTIONS IN OPERATION Charging System When remove the battery, the disconnection sequence of cable terminals shall be strictly observed. (First disconnect the negative cable terminal, next, the positive cable terminal.) MF (Maintenance Free) battery does not need to check, add electrolyte or distilled water. Battery must be taken out from scooter when charging the battery.
  • Page 68 16. ELECTRICAL EQUIPMENT Specification Charging System Item Specification Type YTX7A-BS Capacity 12V6Ah Battery 0.7A / 5~10 hours (standard), 3A / 1 hour (fast Charging rate charging) Leak current < 1 mA Charging current 2.1 A / 5000 rpm ↑ Control voltage in charging 14.0~15.0 V / 5000 rpm Ignition System Item...
  • Page 69 16. ELECTRICAL EQUIPMENT TROUBLE DIAGNOSIS Charging System System Ignition No power supply No spark produced by spark plug The spark plug is out of work Dead battery The cable is poorly connected, open or Disconnect battery cable short-circuited Fuse burned out - Between alternator and C.D.I.
  • Page 70 16. ELECTRICAL EQUIPMENT CHARGING SYSTEM Charging wire diagram green white green fuse(10A green yellow alternator REG.REC. battery green/black Auto Ω by-starter Current Leakage Inspection Turn the main switch to OFF position, and remove the negative cable terminal (-) from the battery. Battery(-) terminal Connect an ammeter between the negative cable terminal and the battery negative...
  • Page 71 16. ELECTRICAL EQUIPMENT Battery Battery cover Removal Remove the battery cover. CAUTION Electrolyte (diluted sulfuric acid) is very toxic. Once it spreading on clothes, skin, or eyes, it will cause burned or blind. In case of being spread, flush with great quantity of water immediately, and then send to hospital.
  • Page 72 16. ELECTRICAL EQUIPMENT Voltage Check With a digital voltage meter or multi-meter to measure battery voltage. Voltage: Fully charged: 13.0 – 13.2V (at 20℃) Undercharged: Below 12.3 V (at 20℃) CHARGING Connect the Charger positive (+) to the battery positive (+) terminal. Connect the Charger negative (-) to the battery negative (-) terminal.
  • Page 73 16. ELECTRICAL EQUIPMENT digital voltmeter Charging Voltage/Current ammeter Inspection Caution Before conducting the inspection, be sure that the battery is fully charged. Use a fully charged battery having a voltage larger than 13.1 V. If undercharged, the current changes dramatically. While starting the engine, the starter Fuse ends motor draws large amount of current from...
  • Page 74 Do not touch the probe of multi-meter by fingers, then the resistance values will be White incorrect because there is some resistance existence in human body. To use the multi-meter recommended by SYM. Otherwise, the measured resistance Yellow Green might be different. 16-9...
  • Page 75 16. ELECTRICAL EQUIPMENT Alternator charging coil Auto Charging coil light coil by-star connector connector Caution The check of alternator charging coil and illumination coil can be done when the alternator is mounted on engine. Check Remove the 3P connector of the alternator. Measure the resistance between the white wire on the alternator and frame ground with Pulse generator...
  • Page 76 16. ELECTRICAL EQUIPMENT IGNITION SYSTEM Ignition System Circuit green Blue /yellow green Black/ yellow Black Pluser spark plug Engine start control switch green Blue/yellow Blue/yellow black/yellow Black green C.D.I. unit green Ignition coil CDI UNIT Removal Remove the right body cover, then the C.D.I. unit can be removed from the frame.
  • Page 77 16. ELECTRICAL EQUIPMENT Ignition coil Ignition coil Removal Remove the luggage box, center cover. Remove spark plug cap. Remove the primary coil wire of ignition coil. Remove the fix bolts for the ignition coil, and remove the ignition coil. Install the ignition coil in reverse order of removal.
  • Page 78 16. ELECTRICAL EQUIPMENT Secondary coil Attached the spark plug cap, measure the resistance between plug cap side and green terminal. Standard value: 7-12 kΩ(20℃) Remove the spark plug cap, measure the resistance between plug cap side and green terminal. Standard value: 3-5 kΩ(20℃) Secondary coil is good if resistance within standard.
  • Page 79 16. ELECTRICAL EQUIPMENT STARTING SYSTEM Starting Circuit Starter magnetic switch inspection Starter magnetic switch Turn main switch to "on", and operate the brake lever. Then press starting button to check if there a click sound. It is normal if there is a click sound.
  • Page 80 16. ELECTRICAL EQUIPMENT Starter Motor Pinion Starter motor pinion Removal/Installation Remove left crankcase cover and drive face. Remove starter motor pinion. Install the starter motor pinion in reverse order of removal. Starter Motor Pinion Inspection Pinion, reduction gear for wear out or damage →...
  • Page 81 16. ELECTRICAL EQUIPMENT Starter Motor Removal/Disassembly Starter motor Remove body cover. Remove bolt and oil pump control cable. Disconnect starter motor harness coupler. Remove 2 bolts for separation starter motor and gasket. Remove 2 bolts for disassembly the starter motor. 2 bolts Armature Inspection Check the armature for discoloration or other...
  • Page 82 16. ELECTRICAL EQUIPMENT Oil Level Switch Main switch Troubleshooting Fuse If the oil level in oil tank is in specified level, but the oil level indicator still goes on. 1. Remove luggage box. 2. Disconnect oil level switch wire, and turn the main switch to ON position.
  • Page 83 16. ELECTRICAL EQUIPMENT Carburetor Heater Power filter Thermo switch Main switch Fuse 10A To REG. REC. Carburetor heater Battery AC. Generator Wire pins Removal/Installation Remove luggage box, rear carrier and body cover. Remove carburetor heater wire pins. Remove carburetor heater. Inspection Carburetor heater Carburetor heater resistance : 7±10%Ω...
  • Page 84 16. ELECTRICAL EQUIPMENT Fuel Unit Removal/Installation Remove luggage box, rear carrier and body cover. Disconnect fuel unit coupler from rear wheel side. Fuel unit coupler Turns the fuel unit retain plate in counter-clockwise direction and then remove the fuel unit retain plate. Remove the fuel unit.
  • Page 85 16. ELECTRICAL EQUIPMENT Lights Tail & stop light Stop switch Position light Meter illuming light Hi beam indicate light Headlight (Hi-beam) Headlight beam switch Main switch Headlight (Lo-beam) Right winker indicate light Winker relay Right winker light Winker switch Fuse 10A Left winker light Left winker indicate light Battery...
  • Page 86 16. ELECTRICAL EQUIPMENT Starting Motor Removal Bolts x2 Remove the battery cover. Firstly, remove the battery negative (-) terminal, and then remove the positive (+) terminal. Remove the luggage box. Remove the starting motor power wire. Remove the starting motor mounting bolts and motor.
  • Page 87 16. ELECTRICAL EQUIPMENT Remove the rear handle cover. Remove the meter mounting screws. Take out the meter. Fuel Gauge Speedometer Turn Left Signal Turn Right Signal Indicator Indicator Clock/Odometer/Trip kilometer High Beam Indicator Engine Oil Warning Light High Beam Indicator Speedometer Time meter Turn Left Signal...
  • Page 88 16. ELECTRICAL EQUIPMENT LIGHT/BULBS Headlight Bulb Replacement Rear the front handle cover. Disconnect the headlight wire connector. Press down the bulb spring locker and then remove the locker with turning it left motion. Remove the bulb. Replace the bulb with new one if necessary. (12V 35W/35W) Caution Do not touch the bulb surface with fingers...
  • Page 89 16. ELECTRICAL EQUIPMENT Front Turn Signal Lamp Bulb Replacement Remove the front handle cover. Remove the wire connector of the turn signal light. Front turn signal light the wire connector of the turn signal light Pull out the bulb and replace it with new one. (12V 10W) Installation Install the bulb in reverse order of removal.
  • Page 90 16. ELECTRICAL EQUIPMENT MAIN SWITCH/HORN Main Switch Check Remove the headlight connector and the front cover. Disconnect main switch leads connector. Check connector terminals for continuity. color green green Black Location LOCK ● ● main switch connector terminals ● ● main switch bolts x 2 ●...
  • Page 91 16. ELECTRICAL EQUIPMENT Handle switch headlight switch Remove the front handle cover. Disconnect the connector of the handle switch. Check the continuity of follow pins listed below columns. Headlight switch color Brown Brown Yellow Pink Yellow /White Location ● ● ●...
  • Page 92 16. ELECTRICAL EQUIPMENT Turn signal light switch color Gray orange Location blue ● ● turn signal FROM R ● ● orange light switch PUSH OFF FROM L ● ● gray Sky blue ● ● Brake light switch The circuit of black wire and the green/yellow wire on the brake light switch should be in continuity when operating the brake lever.
  • Page 93 16. ELECTRICAL EQUIPMENT FUEL UNIT Fuel unit Open the seat. Remove the luggage box(bolts x 4) . Remove the R.R. carrier(bolts x 3) . Remove the body cover. Disconnect the fuel unit wire connector. Caution Do not damage or bend the float arm as removing.
  • Page 95 NO：SYM-9020100 REMOVE ACG FLY WHEEL PURPOSE: REMOVE ONE-WAY CLUTCH FIX NUT ITEM: BEARING DISASSEMBLER ITEM: UNIVERSAL HOLDER NO：SYM-2210100 NO：SYM- 6202Z / 6204 PURPOSE:HOLD THE MDF/CLUTCH OUTER PURPOSE: REMOVE THE BEARING ITEM: CLUTCHSPRING COMPRESSOR ITEM: CLUTCH NUT WRENCH NO：SYM-2301000 NO：SYM-9020200 PURPOSE:DISASSEMBLE THE CLUTCH...
  • Page 96 Disc Brake System Hose·······················2-错 误！未定义书签。 Steering System·····································2-9 Suspension·············································2-9 General Information Specification Item Jet 4 R 50 series Tire dimension Front:120/60–13, Rear: 130/70-12 Tire pressure at cold Only rider Front: 2.0 kg/cm , Rear: 2.0 kg/cm Rear brake lever free play...
  • Page 97 25. Carbon cleaning for cylinder ☆ head, cylinder, and piston head, and exhaust system. Have your scooter checked, adjusted periodically by your SYM Authorized Dealer to maintain the scooter at the optimum condition. Code: I ~ Inspection, cleaning, and adjustment R ~ Replacement...
  • Page 98 Soap the element into cleaning engine oil and then squeeze it out. Install the element onto the element seat and then install the air cleaner cover. Limit to use SAE 20 JASO FC class engine oil; otherwise, SYM is no responsible for the Soap Clean warranty.
  • Page 99 2. Service Maintenance Information Fuel Filter Remove the luggage box. Remove the fuel line from the fuel filter. Replace the fuel filter with new one. Install the fuel filter. The arrow indicates the fuel flowing direction. Check the fuel line for leaking. Fuel filter Engine Oil Line Remove the body cover.
  • Page 100 2. Service Maintenance Information Oil Pump Control Cable Caution To adjust the oil pump control cable after adjusted the throttle grip play. Remove the luggage box. Wide open the throttle valve, and check if the calibration point aligns on the oil pump lever with the mark of pump body.
  • Page 101 2. Service Maintenance Information Tire Caution Tire pressure should be checked when cold. Check tire for cracks, damage, nail, or other object stuck in tread. Recommended tire and tire pressure Front: Rear: Tire size 120 / 60 - 13 130 / 70 - 12 2.0 for one Tire pressure person,2.25 for...
  • Page 102 2. Service Maintenance Information Disc Brake System Hose: (Front Disc Brake Type) Make sure that the brake hose is corrosion or damage,and also check the system for leaking. Brake Fluid: Check brake fluid level in the brake fluid reservoir. If the level is lower than the LOWER limit, add brake fluid DOT-3 to UPPER limit.
  • Page 103 2. Service Maintenance Information Brake Lining Wear: (Rear Drum Brake Type) Arrow Replace the brake lining if the wear limit mark “△” on the brake arm aligning with the indicator of brake drum. Brake lining replacements refer to chapter 12. Brake pad Wear: (Disc Brake Type) The arrow mark on brake pad is the wear limitation.
  • Page 104 2. Service Maintenance Information Steering System Caution The control cables cannot interfere with the rotation of steering handle. Lift the front wheel out of ground, and check if the steering handle turning is smoothly. If handle turning is uneven and bending, stuck, or the handle can be operated in vertical direction, then adjust the handle top bearing by adjusting the steering nut.
  • Page 105 2. Service Maintenance Information Transmission Oil Oil level check bolt Leak Check if the transmission is leak. Draining bolt Check Caution Park the scooter on flat ground with its main stand. Remove the oil level check bolt, and check if the oil level is placed on the hole of check bolt.
  • Page 106 2. Service Maintenance Information Control Cable Lubrication Remove the throttle control and the brake cables periodically, and lubricate the moving parts of the Tooth face cables thoroughly. Belt width Driver Belt Remove left crankcase cover. Check if the belt is crack or worn out. Replace the belt if necessary.
  • Page 107 2. Service Maintenance Information Carburetor Idle Speed Adjustment Pilot screw Caution Inspection & adjustment for idle speed have to be performed after all parts in engine had been adjusted in specification. Idle speed check and adjustment have to be done after engine is being warned up. It around operates engine from stop to running for 10 minutes.
  • Page 108 HEADLIGHT ADJUSTMENT Remove the front cover. Turn on the main switch. Turn the headlight adjustment screw. And adjust the headlight beam height. Then, tighten the adjustment screw after the beam height in proper position. Caution To adjust the headlight beam follows related regulations.
  • Page 109 3. Lubrication System Lubrication System Diagram ················ 3-1 Oil Pump Removal ································· 3-3 Precautions In Operation ······················ 3-2 Oil Pump Installation ····························· 3-3 Lubricant················································· 3-2 Oil Pump/Oil Tube Air Bleeding ··········· 3-4 Trouble Shooting ··································· 3-2 Oil Tank··················································· 3-5 Lubrication System Diagram Oil lever switch Oil tank Oil tube...
  • Page 110 3. Lubrication System Precautions in Operation Be careful not let dirt enters into engine or oil hoses when removing or installing the oil pump. If air is found in the oil tube (from oil tank to oil pump) or oil tube is removed, the oil pump should be conducted air-bleeding operation.
  • Page 111 3. Lubrication System Oil Pump Removal Adjustment nut Mounting nut Caution Before removing the oil pump, clean the oil pump and crankcase. Remove the luggage box and seat. Loosen the mounting nut of the oil pump control Control cable cable, and remove the control cable. Remove the oil tube, and clip its end side to prevent oil from flowing out.
  • Page 112 3. Lubrication System Oil Pump/Oil Tube Air Bleeding Oil output tube Control cable Caution The oil tube system has to be conducted air bleeding operation because air will clog or restraint oil flowing so that causes serious engine damage. Caution After disconnect the oil tube, air enters oil tube due to oil leak out without added oil.
  • Page 113 3. Lubrication System Oil Tank Removal Remove the luggage box and seat. Remove the right / left side covers, right / left rear side covers, center cover, rear carrier, body covers, rear fender and rear inner fender. (Refer to chapter 11) Remove the oil input tube from oil pump, and then drain oil to a clean container.
  • Page 114 3. Lubrication System...
  • Page 115 4. Fuel System Maintenance Information ······················ 4-2 Float Level Inspection ·························· 4-7 Troubleshooting ···································· 4-2 Carburetor Installation ························· 4-7 Throttle Valve········································· 4-3 Reed Valve············································· 4-7 Carburetor Remove······························· 4-4 Air Cleaner············································· 4-9 Auto By-Starter······································ 4-4 Float/Float Valve/Jet······························ 4-6 Fuel cap Fuel unit Fuel tank Fuel pump Throttle valve cable...
  • Page 116 4. Fuel System Maintenance Information Precautions in Operations Warning Gasoline is a highly flammable material and may explosive under circumstance. Thus, always work in a well-ventilated place and strictly prohibit flame when working with gasoline. Care must be taken when dealing with gasoline, and always work in a well-ventilated place and strictly prohibit flame.
  • Page 117 4. Fuel System Throttle Valve Carburetor upper part Removal Remove the body cover. Remove the carburetor upper part, throttle valve spring and sealed cap. Remove the throttle valve cable from the throttle valve. Remove needle clamp and fuel needle. Inspection Sealed cap Throttle valve spring Needle clamp...
  • Page 118 4. Fuel System 2 bolts Clamps Carburetor Remove Remove 2 bolts and then remove the air cleaner. Loosen connection hose clamp. Auto by-starter coupler Disconnect the auto by-starter coupler. Loosen draining screw and then drain out fuel inside the carburetor. Loosen carburetor upper part and remove Carburetor Fuel hose...
  • Page 119 4. Fuel System Remove carburetor, and allow it to cool off for 30 minutes. Connect fuel rich circuit with a hose and pump compressed air to the hose. Air should flow into fuel rich circuit. Replace the auto by-starter if the circuit clogged. Connect battery to starter’s connectors and wait for several minutes.
  • Page 120 4. Fuel System Float/Float Valve/Jet Removal Remove the float from carburetor body. Remove the float pin and then remove float and float valve. Check the valve seat for worn out or damage. Check float for bend and if fuel inside the float. Before removing both the throttle valve stopper and air screws, record their original turns for close to their original set up position as installation.
  • Page 121 4. Fuel System Float Level Inspection Measures float fuel level to have the upper end of float just contact with the float. Float fuel level: 8.8 mm Carefully bend the float arm for adjustment. Check the float operation and the install it. Carburetor Carburetor Installation Fuel hose...
  • Page 122 4. Fuel System Inspection Reed valve Reed valve stopper Check the reed valve for damage and its reed strength. Check the reed valve seat for crack, damage and the clearance between the seat and the valve. Replace reed valve if necessary. Caution Do not bend the reed valve stopper.
  • Page 123 4. Fuel System Air Cleaner 1 screw Removal/Installation Remove air cleaner and rear inner fender mounting screw. Hose clamp Loosen connection hose clamp. Remove 2 bolts and then remove the air cleaner. Install in the reverse order of removal procedures. 2 bolts...
  • Page 124 5. Engine Removal Maintenance Information ······················ 5-2 Engine hanger bracket························· 5-6 Engine removal ······································ 5-3 Engine installation ······························· 5-6 4.5~5.5kgf-m 3.5~4.5kgf-m 2.4~3.0kgf-m 4.5~5.5kgf-m 4.5~5.5kgf-m 4.5~5.5kgf-m...
  • Page 125 5. Engine Removal Maintenance Information There are parts that require removal of engine for maintenance. Crankcase ● Crankshaft ● Related bolts tightening torque for removal of engine: Engine hanger bolt 4.5~5.5kgf-m Engine hanger bracket bolt 4.5~5.5kgf-m Rear cushion upper mounting bolts 3.5~4.5kgf-m Rear cushion lower mounting bolts 2.4~3.0kgf-m...
  • Page 126 5. Engine Removal Engine removal Fuel output tube Spark plug Remove body cover. Remove the spark plug cap from the spark plug. Remove the fuel output and the vacuum tubes from fuel pump. Vacuum tube Remove the oil control cable from oil pump. Control cable Remove the oil tube from oil pump and then clip the tube.
  • Page 127 5. Engine Removal Drum type rear brake Remove rear brake cable from engine rear-lower side. Remove brake cable from cable clamp. Rear brake cable Remove air cleaner and rear inner fender 1 screw mounting screw. Loosen connection hose clamp. Hose clamp Remove 2 bolts and then remove the air cleaner.
  • Page 128 5. Engine Removal Remove two exhaust pipe connection nuts. Connection nuts Remove three bolts beside fan cover and exhaust pipe. 3 bolts Support the engine and then remove cushion Rear cushion lower lower mounting bolt. mounting bolt Remove engine mounting nut and bolt. (Each side 1 bolt and 1 nut) Remove the engine.
  • Page 129 5. Engine Removal Engine Hanger Bracket Removal Remove the frame side right and left side bolts of engine hanger bracket. (1 bolt on each side) Disassembly Remove the engine hanger bracket nut and bolt. Each side one bolt Disassembly engine hanger bracket A and engine hanger bracket B.
  • Page 130 6. Cylinder Head/Cylinder/Piston Maintenance Information······················ 6-2 Cylinder Head········································· 6-3 Troubleshooting···································· 6-2 Cylinder/Piston ······································ 6-5 1.6~2.0kgf-m 1.1~1.7kgf-m...
  • Page 131 6. Cylinder Head/Cylinder/Piston Maintenance Information Precautions in Operation The inspection and maintenance of the cylinder head, cylinder and piston can be carried as engine mounted on the body. It should clean the engine to prevent dirt from entering into cylinder and crankcase before removal. Remove all washes from the interfaces of cylinder head, cylinder and crankcase.
  • Page 132 6. Cylinder Head/Cylinder/Piston Cylinder Head Fuel output tube Vacuum tube Cylinder Head Removal Removal luggage box, body covers and center cover. Remove fuel pump tubes. Fuel inlet tube 2 nuts Remove spark plug cap. Remove fuel pump bracket (2 nuts). Remove vacuum tube and oil pump control cable from engine shield.
  • Page 133 6. Cylinder Head/Cylinder/Piston Remove engine shield. Cylinder Head Removal 4 bolts Remove spark plug. Remove the 4 cylinder head bolts and then remove the cylinder head. Caution Loosen the cylinder head bolts with diagonal direction to avoid to damaging it. Cleaning Carbon in Combustion Chamber Clean carbon deposit in which built up in combustion chamber with shown chisel.
  • Page 134 6. Cylinder Head/Cylinder/Piston Cylinder/Piston Connection nut Remove spark plug cap. Remove fan cover. Remove engine shield. Remove two connection nuts of the exhaust pipe. Remove exhaust muffle mounting bolt, and then remove the exhaust muffler. 3 bolts Cylinder Removal Remove cylinder head. Be careful to pull the cylinder up and prevent piston from damage.
  • Page 135 6. Cylinder Head/Cylinder/Piston Check if cylinder and piston are worn or damaged, and then clean carbon deposit on exhaust opening area as the diagram shown. Caution Do not scratch both the cylinder and the piston. Use a straight edge and a feeler gauge to measure the cylinder head for warp.
  • Page 136 6. Cylinder Head/Cylinder/Piston Measure the piston pinhole ID of piston. The ID of piston pinhole Measure the OD of piston pin. The OD of piston pin Piston Ring Inspection Measure the end gap of each piston ring. Caution With the piston, push each piston ring into cylinder correctly.
  • Page 137 6. Cylinder Head/Cylinder/Piston Piston/Cylinder Installation Install the expanding ring into the groove of 2 ring. Align the ring end with the lock pin in the ring groove. Install the top ring and the 2 ring onto the ring groove respective. Caution The top ring and the 2 ring cannot be...
  • Page 138 6. Cylinder Head/Cylinder/Piston Lubricate cylinder and piston with two-stroke engine oil. Hold the piston and then install it into cylinder. Caution To avoid to damaging the piston and the cylinder sliding surface. Lock pin Install the cylinder head. 4 bolts Tighten torque: 1.6~2.0kgf-m Replace the exhaust pipe washer with new one Connection nut...
  • Page 139 7. A.C. Generator Maintenance Information············7-2 Generator Installation ·················7-4 Generator Removal ·····················7-3 0.8~1.2kgf-m 0.8~1.2kgf-m 0.8~1.2kgf-m 3.5~4.5kgf-m...
  • Page 140 7. A.C. Generator Maintenance Information Precautions in Operation The maintenance service of A.C. generator can be carried out directly on the scooter. Please refer to Chapter 15 for the relative A.C. generator inspection. Torque value: Flywheel 3.5~4.5kgf-m Special Service Tools: Flywheel puller Universal holder Coil resistance value for the A.C.
  • Page 141 7. A.C. Generator Generator Removal Remove the luggage box and rear side cover. Remove 3 bolts and then take out cooling fan cover. 3 Bolts Remove 4 bolts, and then take out the cooling fan. 4 bolts 10mm flanged nut Hold flywheel with universal holder.
  • Page 142 7. A.C. Generator Disconnect generator wire coupler and pulse coil Generator coupler coupler. Pulse coil coupler Remove the pulse coil and generator coil bolts (4 4 bolts bolts), and then take out the generator assembly. Caution Care to be taken for not damaging the generator coil.
  • Page 143 8. "V" Type Belt Drive System/Kick-Starter Maintenance Information ···················· 8-2 Drive Belt·············································· 8-5 Trouble Shooting ································· 8-2 Movable Drive Face ····························· 8-6 Left Crankcase Cover ·························· 8-3 Clutch/Driven Pulley···························· 8-10 Reassembly Of Kick Starter················ 8-4 Installation Of The Left Crankcase Cover ·······························································...
  • Page 144 8. "V" Type Belt Drive System/Kick-Starter Maintenance Information Precautions In Operation The surfaces of drive belt and driven pulley must be free of grease. Specification Item Standard value (mm) Drive belt width 18.0 ID of movable drive face 23.964~23.985 OD of movable drive face boss 20.01~20.026 OD of weight roller 12.95~13.00...
  • Page 145 8. "V" Type Belt Drive System/Kick-Starter Left Crankcase Cover Left crankcase cover removal Remove rear left body side cover. Remove air cleaner (2 bolts). Remove kick-start arm (1 bolt). Remove left crankcase cover (11 bolts). 11 bolts Disassembly of Kick Starter Return spring Remove snap clip and thrust washer from left crankcase cover.
  • Page 146 8. "V" Type Belt Drive System/Kick-Starter Reassembly of Kick Starter Kick starter spindle Install bush, return spring and starter spindle as diagram shown. Install thrust washer and snap clip onto starter spindle. Return spring Install kick-starter lever temporary. Width-tooth Driven gear Slightly rotate the lever and then align driven gear with width-tooth on the starter spindle.
  • Page 147 8. "V" Type Belt Drive System/Kick-Starter Drive Belt Removal Remove left crankcase cover. Hold clutch outer with universal holder, and remove nut and clutch outer. Caution Using special tools for tightening or loosening the nut. Fixed rear wheel or rear brake will damage reduction gear system.
  • Page 148 8. "V" Type Belt Drive System/Kick-Starter Install the driven pulley that has installed the belt Drive shaft Drive face Drive belt onto drive shaft. Clutch/driven pulley Hold the clutch outer, and then tighten nut to Clutch outer specified torque value. Torque value: 5.5~6.5kgf-m Movable Drive Face Universal holder...
  • Page 149 8. "V" Type Belt Drive System/Kick-Starter Removal Drive face boss Movable drive face Remove movable drive face set and drive belt from crankshaft. Crankshaft Remove ramp plate. Ramp plate Remove weight rollers from movable face. Movable drive face Weight roller Inspection Weight roller The weight roller is to press movable driven face...
  • Page 150 8. "V" Type Belt Drive System/Kick-Starter Check if movable drive face boss is worn or Movable drive face damage and replace it if necessary. Measure the outer diameter of drive face boss, and replace it if it exceed service limit. Measure the inner diameter of drive face, and replace it if it exceed service limit.
  • Page 151 8. "V" Type Belt Drive System/Kick-Starter Install movable drive face assembly onto Drive face boss Movable drive face crankshaft. Crankshaft Drive belt Drive Face Installation Press down Press drive belt into pulley groove, and then pull the belt on to crankshaft. Install drive face, washer and nut.
  • Page 152 8. "V" Type Belt Drive System/Kick-Starter Clutch/Driven Pulley Clutch nut Disassembly wrench Remove drive belt and clutch/driven pulley. Install clutch spring compressor onto the pulley assembly, and operate the compressor to let nut be installed more easily. Special tool: Clutch spring compressor Clutch nut wrench Caution Clutch spring...
  • Page 153 8. "V" Type Belt Drive System/Kick-Starter Clutch weight Clutch weight Measure each clutch weight thickness. Replace it if exceeds service limit. Driven pulley spring Measure the length of driven pulley spring. Replace it if exceeds service limit. Free length Driven pulley Check following items: If both surfaces are damage or wear.
  • Page 154 8. "V" Type Belt Drive System/Kick-Starter Clutch Block Replacement Spring Drive plate Remove clip and washer, and then remove clutch weight and spring from drive plate. Caution Some of models are equipped with one mounting plate instead of 3 snap clips. Check if spring is damage or insufficient elasticity.
  • Page 155 8. "V" Type Belt Drive System/Kick-Starter Install snap clip and mounting plate onto lock pin. Snap clip Replacement of Driven Pulley Bearing Remove inner bearing. Outer bearing Clip Caution If the inner bearing equipped with oil seal on side in the driven pulley, then remove the oil seal firstly.
  • Page 156 8. "V" Type Belt Drive System/Kick-Starter Installation of Clutch/Driven Pulley Oil seal Assembly Install new oil seal and O-ring onto sliding pulley. Apply with specified grease to lubricate the inside of sliding pulley. O-ring Specified grease Install sliding pulley onto driven pulley. Sliding pulley Oil seal Guide pin...
  • Page 157 9. Final Driving Mechanism Maintenance Information····················· 9-2 Inspection of Final Driving Mechanism ································································ 9-6 Troubleshooting··································· 9-2 Bearing Replacement ··························· 9-7 Disassembly of Final Driving Mechanism ······························································· 9-3 Re-Assembly of Final Driving Mechanism ································································ 9-8 Bearing 6004UU Oil seal 27x42x7 Bearing 6201 Bearing 6203 Bearing 6201 Bearing 6203...
  • Page 158 9. Final Driving Mechanism Maintenance Information Limited usage of gear oil: gear oil #140 Recommended oil: Bramax serial oil. Oil quantity: 110 c.c. (100 c.c. as replacement) Torque Values: Mission cover bolt 2.4~3.0kgf-m Mission oil drain bolt 1.0~1.5kgf-m Mission oil check bolt 1.0~1.5kgf-m Troubleshooting Trouble Diagnosis...
  • Page 159 9. Final Driving Mechanism Disassembly of Final Driving Gear Oil filling bolt Mechanism Remove driven pulley Remove gear oil drain bolt and filling bolt. Drain gear oil out from gearbox. Gear Oil draining bolt Remove muffler and rear wheel. Rear wheel nut 7 bolts Remove gearbox cover mounting bolts from the clutch side (7 bolts).
  • Page 160 9. Final Driving Mechanism Remove final gear, final shaft and counter gear, counter shaft. Counter shaft Final shaft Remove the drive shaft from left crankcase. Caution The bearing must be replaced when removing the drive shaft. Drive shaft Special tool Drive shaft is pulled out with it’s bearing, then remove the bearing with bearing puller and shaft protector.
  • Page 161 9. Final Driving Mechanism Remove final gear, final shaft and counter gear, counter shaft. Final shaft Counter shaft Remove the drive shaft from left crankcase. Caution The bearing must be replaced when removing the drive shaft. Drive shaft Drive shaft is pulled out with it’s bearing, then Special tool remove the bearing with bearing puller and shaft protector.
  • Page 162 9. Final Driving Mechanism Inspection of Final Driving Mechanism Check if the drive shaft are burn, wear or damage and replace it if necessary. Caution If remove the drive shaft from the gear box upper side, then its bearing has to be replaced.
  • Page 163 9. Final Driving Mechanism Bearing Replacement Special tool Remove gearbox bearing from left crankcase and gearbox cover using following tools. Caution Never install used bearings. Once bearing removed, it has to be replaced with new one. Special tool Install new bearings into left crankcase. Install new bearings into gearbox cover.
  • Page 164 9. Final Driving Mechanism Re-Assembly of Final Driving Extension bush Shaft install bush Mechanism Install drive shaft. With the special service tools to install drive shaft by through the bearing. Special tool: R. Crank shaft puller L. Crank shaft install bush Extension bush Extension bush R.

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