LIGHTS/METERS/SWITCHES Route the fuel unit wire and connect the 3P connector. Install the fuel tank (page 5-3). Disconnect the wire connectors from the horn. Connect the battery voltage to the horn terminals. The horn is normal if it sounds when the battery connected across the horn terminals. TURN SIGNAL RELAY INSPECTION Check the fcllowing: - battery condition - burned out bulb or non-specified wattage - burned fuse - ignition switch and turn signal switch function - loose connectors If above items all normal, check the following: Remove the rear cowl (page 2-3). Disconnect the connector from the relay. 1. Short the White/Green and Gray terminals of the turn signal relay connector with a jumper wire. Check the turn signal light by turning the switch \"R\" or \"L\". i i Lights comes on Lights does not ccme on Broken wire harness. i I CONNECTORS ,. Faulty turn signal relay. Poor connection of the connector. 20-13
COOLING FAN MOTOR SWITCH INSPECTION Remove the right middle cowl (page 2-4). Fan motor does not stop Turn the ignition switch OFF, disconnect the connector from the fan motor switch and turn the ignition switch ON again. If the fan motor does not stop, check for a shorted wire between the fan motor and switch. If the fan motor stops, the fan motor switch is faulty. Fan motor does not start Before testing, check for a blown fan motor fuse (10A). Warm up the engine to operating temperature. Disconnect the connector from the fan motor switch and ground the connector terminal to the body ground. Turn the ignition switch ON and check the fan motor. If the motor starts, check the connection at the fan motor switch terminal. If it is OK, the fan motor switch is faulty. If the motor does not start, remove the fuel tank (page 5- 4) and check for voltage between the Blue (+) and Green(- ) terminals at the fan motor switch 2P connector of the main harness side. - Battery voltage: Faulty fan motor - No battery voltage: Open circuit or poor connection in Blue or Green wire REMOVALANSTALLATION Drain the coolant (page 6-5). Disconnect the fan motor switch connector and remove the fan motor switch. Install a new O-ring onto the switch. Install and tighten the switch. Connect the switch connector. Fill and bleed the cooling system (page 6-5). Install the removed parts in the reverse order of removal. 20-14
COOLANT TEMPERATURE GAUGE/ THERMOSENSOR SYSTEM INSPECTION Remove the fuel tank (page 5-3). Disconnect the thermosensor connector and ground the connector terminal to the body ground. Turn the ignition switch ON and check the coolant temperarute gauge needle. The needle should move to \"H\". CAUTION: Immediately turn the ignition switch OFF when the needle move to \"H\" (hot) to prevent the gauge from damaging. - If the needle moves, check the thermosensor. - If the needle does not move, check for open circuit in GreedBlue wire. If the GreenlBlue wire is OK, replace the coolant temperature gauge. TEMPERATURE 20-15
LIGHTS/METERS/SWITCHES THERMOSENSOR INSPECTION Keep flammable materials away from the electric heating element. Wear protective clothing, insulated gloves and eye protection. Drain the coolant (page 6-51. Disconnect the thermosensor connector and remove the thermosensor. Suspend the thermosensor in a pan of coolant (50 - 50 mixture) on an electric heating element and measure the resistance through the sensor as the coolant heats up: NOTE: Soak the thermosensor in coolant up to its threads with at least 40 mm (1.57 in) from the bottom of the sensor. Keep temperature constant for 3 minutes before testing. A sudden change of temperature will result in incorrect readings. Do not let the thermometer or thermosensor touch the pan. Temperature I 50 \"C (122 \"F) I 120 \"C (248 \"F) Resistance 133.9- 17a.9~ 14.9- 17.3~ Replace the sensor if it is out of specifications by more than 10 % at any temperature listed. Install the thermosensor. Apply sealant to the thermosensor threads. Do not apply sealant to the sensor head. Connect the thermosesor connector. Fill and bleed the cooling system (page 6-5). CLUTCH SWITCH Disconnect the clutch switch connectors and check for continuity. There should be continuity with the clutch lever applied and no continuity with it released. THERMOMETER \\A THERMOSENSOR 20-16
LIGHTS/METERS/SWITCHES TACH 0 M ETER Disassemble the upper cowl (page 2-5). Connect the combination meter 9P and tachometer 2P connector. Check the continuity between the Green wire terminal and body ground. There should be continuity. If there is no continuity, check for open circuit in the Green wire. Turn the ignition switch ON and measure the voltage between the WhitdGreen (+) and Green (-1 wire terminals. There should be battery voltage. If there is no voltage, check for open circuit in White/Green wire. Start the engine and measure the voltage between the Yellow/Green (+I and Green (-) wire terminals. There should be at least 6V pulse voltage. If there is no voltage, check the following: - open cicuit in Yellow/Green wire - ignition control module (ICM) (page 18-6) If there is continuity and ICM is normal, replace the tachometer. For tachometer replacement, see 20-5; combination meter disassembly and assembly. 20-17
~~ ENGINE DOES NOT START OR IS POOR PERFORMANCE AT HIGH HARD TO START 22-1 SPEED 22-4 ENGINE LACKS POWER 22-2 POOR HANDLING 22-4 POOR PERFORMANCE AT LOW AND IDLE SPEED 22-3 ENGINE DOES NOT START OR IS HARD TO START Possible cause 1. Check the fuel flow to carburetor - I Reaching carburetor 1 Perform a spark test Good spark Remove and inspect spark plug Good ___ I Start by following normal procedure - Engine does not start I Test cylinder compression Not reaching - Clogged fuel line and fuel auto valve carburetor Clogged fuel tank breather Weak or no spark - Faulty spark plug Fouled spark plug Faulty ignition control module (ICM) Broken or shorted spark plug wire Faulty ignition switch Faulty ignition pulse generator Loose or disconnected ignition system wires Wet plug Flooded carburetor Starting enrichment (SE) valve ON position (open) Throttle valve open Air cleaner dirty Engine starts but - lmproper choke operation stops Carburetor incorrectly adjusted Intake pipe leaking Improper ignition timing (Faulty ICM or ignition pulse generator) Fue\\ contaminated Low compression - Valve clearance too small Valve stuck open Worn cylinder and piston ring Damaged cylinder head gasket Seized valve Improper valve timing 22-1
ENGINE LACKS POWER Possible cause 1. Raise wheel off the ground and spin by - Wheels do not spin - Brake dragging hand freely Worn or damaged wheel bearing Wheel pins freely I Pressure low - Faulty tire valve 4 t 2. Check tire pressure Pressure normal I Punctured tire 3. Accelerate rapidly from low to second - Engine speed - Clutch slipping I doesn't change Worn clutch discs/plates Engine speed reduced when clutch is accordingly Warped clutch discs/plates released when clutch Weak clutch spring is released Additive in engine oil Engine speed does - Starting enrichment (SE) valve ON t 4. Accelerate lightly I not increase position (open) Engine speed increase Clogged air cleaner Restricted fuel flow Clogged muffler Pinched fuel tank breather Incorrect * Faulty ignition control module (ICM) Faulty ignition pulse generator 1 5. Check ignition timing I Correct Incorrect - Valve stuck open 4 1 t t + 6. Test cylinder compression I Worn cylinder and piston rings Normal Leaking cylinder head gasket Improper valve timing 7. Check carburetor for clogging Clogged - Carburetor not serviced frequently I enough Not clogged 8. Remove spark plug Fouled or - Plug not serviced frequently enough I discolored Spark plug is the incorrect heat Not fouled or discolored range 9. Check oil level and condition lncorrect * Oil level too high I Oil level too low Correct Contaminated oil 10. Remove cylinder head cover and inspect - Valve train not - Clogged oil passage lubrication lubricated Clogged oil pumD Valve tranin lubricated properly I properly 22-2
\\ 11. 12. Excessive carbon build-up in combustion chamber Use of poor quality fuel Clutch slipping Lean fuel mixture Wrong type of fuel Faulty ignition control module (ICM) Faulty ignition coil Faulty alternator Broken or shorted spark plug wire Faulty ignition pulse generator Faulty ignition switch Loose or disconnected ignition system wires 1 Engine does not knock Ignition timing too advance (Faulty ICM) Lean fuel mixture POOR PERFORMANCE AT LOW AND IDLE SPEED Possible cause 1. Check carburetor pilot screw adjustment - Incorrect - Seesection5 I Correct 2. Check for leaking carburetor insulator ~ Leaking * Loose carburetor insulator bands t I Damaged carburetor insulator Not leak Good spark 22-3
TROUBLESHOOTING POOR PERFORMANCE AT HIGH SPEED Possible cause Disconnect fuel tube at carburetor and - Fuel flow restricted - Clogged fuel line and fuel auto valve check fuel flow Clogged fuel tank breather Fuel flows freely I Remove the carburetor and check for ~ Clogged - Carburetor not serviced frequently clogging enough Not clogged + + 4 I Check valve Incorrect - Cam sprockets not installed prop- timing Correct I erly. 4. Check ignition timing Incorrect - Faulty ignition control module (ICM) I Faulty ignition pulse generator Correct Weak * Faulty valve spring 1 1 5. Check valve spring Not weak POOR HANDLING Possible cause 1. If steering is heavy - Steering stem adjusting nut too tight Damaged steering head bearings - Excessive wheel bearing play Bent rim Improper installed wheel hub Swingarm pivot bushing excessively Bentframe 2. If either wheel is wobbling worn 3. If the motorcycle pulled to one side * Faulty shock absorber Front and rear wheel not aligned Bentfork Bent swingarm Bent axle 22-4
BRAKE FLUID REPLACEMENT/AIR BLEEDING ...... 16-3 BRAKE LIGHT SWITCH ...... ........ 3-18 BRAKE LIGHT SWITCH (SY N) ... 20-8 BRAKE PAD WEAR ................................................... 3-18 BRAKE PEDAL ..... BRAKE PAD/DISC CARBURETOR CHOKE .................................... CARBURETOR DISASSEMBLY .............. CARBURETOR INSTALLATION .............. CHARGING SYSTEM INSPECTION ......................... 17-5 CLUTCH .................. CLUTCH/NEUTRAL COOLANT REPLACEMENT ........................................ 6-4 COOLANT TEMPERATURE GAUGE/THERMOSENSOR ..... CRANKCASE ASSEMBLY .. CRANKCASE BREATHER ... CRANKSHAFT REMOVAL ........... CYLINDER INSTALLATION . CYLINDER HEAD ASSEMBLY ................................ 10-17 D REMOVAL ....... ................................................. 5-3 HANDLEBAR ............................................................. 14-3 ..................... 20-8 ................... 20-13 ..................... 18-5 ..................... 18-5 LIGHT AIM ....................... ..................... 3-19 POOR PERFORMANCE AT LOW P R R R R R R R ................... 16-12 R R R RIGHT CRANKCASE COVER REMOVAL ................... 8-3 SECONDARY AIR SUPPLY SYSTEM SECONDARY AIR SUPPLY SYSTEM AND IDLE SPEED .......................................... 22-3 (MAINTENANCE) ..................... (SYSTEM INSPECTION) ................................ 5-15 (CYLINDER HEADNALVES) ... ....................... 1-2 SHOCK ABSORBE SIDE STAND ......... 23-1
SPARK PLUG ............................................................... 3-6 SPECIFICATIONS ........................................................ 1-4 STARTER CLUTCH ......... STARTER MOTOR ......... STARTER RELAY SWITCH ..................................... 19-10 ..................................................... 5-4 ............................................................. 6-6 E VALUES ........... TRANSMISSION DISASSEMBLY ............................ 12-3 TROUBLESHOOTING (ALTERNATOR/STARTER CLUTCH) ..... (COOLING SYSTEM) ............................ (BRAKE SYSTEM) ................................................... 16-2 (CLUTCH/GEARSHIFT LINKAGE) ... (CRANKSHAFT/BALANCER) ........... (CYLINDER HEADNALVESJ ............. (CHARGING SYSTEM) ........................................... 17-3 (CYLINDER/PISTON). .............................................. 11-2 (ELECTRIC STARTER) ... ...... 19-2 (FRAME/BODY PANELS ........ 2-1 (FRONT WHEEUSUSPENSION/STEERI\") ......... 14-2 (FUEL SYSTEM) .......... (IGNITION SYSTEM) .... (LIGHTS/METERS/SWI (LUBRICATION SYSTEM) ......................................... 4-1 (REAR WHEEUSUSPENSION) ............................... 15-2 TURN SIGNAL RELAY .... UNDER COWL ........................................... 2-3 VALVE CLEARANCE .................................................... 3-8 VALVE GUIDE REPLACEMENT VALVE SEAT INSPECTION ....... VALVE SEAT REFACING ......................................... 10-15 23-2
3. Maintenance 37 - 58 4. Lubrication system 59 - 65 5. Fuel system 66 - 82 6. Cooling System 83 - 98 7. Engine removal/Installation 99 - 106 8. Clutch/Gearshift linkage 107 - 121 9. Alternator/Starter Clutch 122 - 130 10. Cylinder head/Valves 131 - 154 11. Cylinder/Piston 155 - 164 12. Transmission 165 - 179 13. Crankshaft/Balancer 180 - 185 14. Front wheel/Suspension/Steering 186 - 209 15. Rear wheel/Suspension 210 - 224 16. Brake system 225 - 248 17. Charging system 249 - 257 18. Ignition system 258 - 265 19. Electric starter 266 - 277 20. Lights/Meter/Switches 278 - 295 21. Wiring diagram 296 22. Troubleshooting 297 - 300 23. Index 301 - 302
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