Yamaha YFM660 01 User Manual
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Page 321
8 - 40 –+ELECCOOLING SYSTEM C0NTINUITY EB803028 CORRECT 7.Wiring connection Check the connections of the entire starting system. Refer to “CIRCUIT DIAGRAM”. This circuit is not faulty. * POOR CONNECTION Properly connect the cooling system.
Page 322
9 - 1 TRBL SHTG STARTING FAILURE/HARD STARTING TROUBLESHOOTING NOTE: The following troubleshooting does not cover all the possible causes of trouble. It should be helpful, however, as a guide to troubleshooting. Refer to the relative procedure in this manual for inspection, adjustment and replacement of parts. STARTING FAILURE/HARD STARTING FUEL SYSTEM Fuel tank Empty Clogged fuel filter Clogged fuel strainer Clogged fuel breather hose Deteriorated or contaminated fuel Fuel cock Clogged fuel...
Page 323
9 - 2 TRBL SHTGSTARTING FAILURE/HARD STARTING/POOR IDLE SPEED PERFORMANCE/POOR MEDIUM AND HIGH-SPEED PERFORMANCE COMPRESSION SYSTEM Cylinder and cylinder head Loose spark plug Loose cylinder head or cylinder Broken cylinder head gasket Broken cylinder gasket Worn, damaged or seized cylinder Valve, camshaft and crankshaft Improperly sealed valve Improperly contacted valve and valve seat Improper valve timing Broken valve spring Seized camshaft Seized crankshaftPiston and piston rings...
Page 324
9 - 3 TRBL SHTGFAULTY GEAR SHIFTING/ CLUTCH SLIPPING/DRAGGING FAULTY GEAR SHIFTING HARD SHIFTING Refer to “CLUTCH DRAGGING”. SHIFT PEDAL DOES NOT MOVE Shift shaft Bent shift shaft Shift drum and shift fork Groove jammed with impurities Seized shift fork Bent shift fork guide barTransmission Seized transmission gear Jammed impurities Incorrectly assembled transmission Shift guide Broken shift guide JUMP-OUT GEAR Shift shaft Improperly adjusted shift lever position Improperly returned stopper...
Page 325
9 - 4 TRBL SHTGOVERHEATING/OVER COOLING/ FAULTY BRAKE OVERHEATING OVERHEATING Ignition system Improper spark plug gap Improper spark plug heat range Faulty CDI unit Fuel system Improper carburetor main jet (improper setting) Improper fuel level Clogged air filter element Compression system Heavy carbon depositEngine oil Improper oil level Improper oil viscosity Inferior oil quality Brake Brake drag Cooling system Low coolant level Clogged or damaged radiator Damaged or faulty water pump...
Page 326
9 - 5 TRBL SHTG SHOCK ABSORBER MALFUNCTION MALFUNCTION Bent or damaged damper rod Damaged oil seal lip Fatigued shock absorber spring SHOCK ABSORBER MALFUNCTION/ UNSTABLE HANDLING/LIGHTING SYSTEM UNSTABLE HANDLING UNSTABLE HANDLING Handlebar Improperly installed or bent Steering Incorrect toe-in Bent steering stem Improperly installed steering stem Damaged bearing or bearing race Bent tie rods Deformed steering knuckles Tires Uneven tire pressures on both sides Incorrect tire pressure...
Page 327
YAMAHA MOTOR CO., LTD. 2500 SHINGAI IWATA SHIZUOKA JAPAN PRINTED IN U.S.A.
Page 328
YFM660R WIRING DIAGRAM 1AC magneto 2Rectifier/regulator 3Main switch 4Battery 5Fuse 6Starter relay 7Starter motor 8Clutch switch 9Park switch 0CDI unit AIgnition coil BSpark plug CSpeed sensor DCircuit breaker (fan motor) EThermo switch 1 FFan motor GCoolant temperature warning light HReverse indicator light INeutral indicator light JNeutral switch KReverse switch LDiode MThermo switch 2 NHandlebar switch (left) OLights switch PEngine stop switch QStart switch RHeadlight STail/brake light TRear brake...