Yamaha YXR660FAS Service Manual Page 412
- Page / 421
- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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TRBL
SHTG
EBS00537
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 check,
adjustment and replacement of parts.
STARTING FAILURE/HARD STARTING
FUEL SYSTEM
Fuel tank
• Empty
• Clogged fuel filter
• Clogged fuel breather hose
• Deteriorated or contaminated fuel
Fuel pump
• Clogged fuel hose
• Damaged vacuum hose
Carburetor
• Deteriorated or contaminated fuel
• Clogged pilot jet
• Clogged pilot air passage
• Sucked-in air
• Deformed float
• Worn needle valve
• Improperly sealed valve seat
• Improperly adjusted fuel level
• Improperly set pilot jet
• Clogged starter jet
• Starter plunger malfunction
Air filter
• Clogged air filter element
ELECTRICAL SYSTEM
Spark plug
• Improper plug gap
• Worn electrodes
• Wire between terminals broken
• Improper heat range
• Faulty spark plug cap
Ignition coil
• Broken or shorted primary/secondary
• Faulty spark plug lead
• Broken body
C.D.I. system
• Faulty C.D.I. unit
• Faulty pickup coil
• Broken woodruff key
Switches and wiring
• Faulty main switch
• Broken or shorted wiring
• Faulty gear position switch
• Faulty brake light switch
Starter motor
• Faulty starter motor
• Faulty starter relay
• Faulty starter clutch
Battery
• Faulty battery
STARTING FAILURE/HARD STARTING
- YXR660FAS 1
- EBS00001 2
- HOW TO USE THIS MANUAL 4
- EBS00006 5
- TABLE OF CONTENTS 7
- CONTENTS 8
- CHAPTER 1 8
- CHAPTER 2 8
- SPECIFICATIONS 8
- CHAPTER 3 9
- CHAPTER 4 10
- CHAPTER 8 14
- CHAPTER 9 15
- CHAPTER 10 17
- TROUBLESHOOTING 17
- GENERAL INFORMATION 18
- FEATURES 19
- IMPORTANT INFORMATION 22
- CHECKING OF CONNECTIONS 24
- SPECIAL TOOLS 25
- SAE 5W30 30
- GENERAL SPECIFICATIONS 31
- ENGINE SPECIFICATIONS 33
- (2.5°/0.055 in) 35
- (2.5°/0.063 in) 35
- CHASSIS SPECIFICATIONS 41
- ELECTRICAL SPECIFICATIONS 43
- TIGHTENING TORQUES 45
- EBS00022 51
- EBS00023 51
- EBS00024 52
- COOLANT FLOW DIAGRAMS 53
- OIL FLOW DIAGRAMS 56
- CABLE ROUTING 61
- INTRODUCTION 78
- INTRODUCTION/ 78
- ADJUSTING THE VALVE CLEARANCE 80
- ADJUSTING THE TIMING CHAIN/ 83
- ADJUSTING THE IDLING SPEED 83
- ADJUSTING THE IDLING SPEED/ 84
- ADJUSTING THE THROTTLE CABLE 84
- ADJUSTING THE THROTTLE CABLE/ 85
- ADJUSTING THE STARTER CABLE 85
- 18 Nm (1.8 m 86
- CHECKING THE IGNITION TIMING 87
- CHECKING THE IGNITION TIMING/ 88
- CHECKING THE ENGINE OIL LEVEL 90
- CHANGING THE ENGINE OIL 91
- 30 Nm (3.0 m 92
- CHANGING THE ENGINE OIL/ 93
- CLEANING THE AIR FILTER 93
- CLEANING THE AIR FILTER/ 95
- CHECKING THE COOLANT LEVEL 95
- CHECKING THE COOLANT LEVEL/ 96
- CHANGING THE COOLANT 96
- LIGHT/CHECKING THE V-BELT 100
- CHECKING THE V-BELT 101
- CHECKING THE V-BELT/ 102
- CLEANING THE SPARK ARRESTER 102
- ADJUSTING THE BRAKE PEDAL 103
- ADJUSTING THE PARKING BRAKE 104
- 4 Reverse 109
- 5 Select lever shift rod 109
- 1 Neutral 109
- 23 Nm (2.3 m 110
- CHANGING THE FINAL GEAR OIL/ 111
- CHECKING THE STEERING SYSTEM/ 114
- ADJUSTING THE TOE-IN 114
- Rawhide 117
- CHECKING THE TIRES 118
- CHECKING THE WHEELS/ 119
- LUBRICATING THE PEDAL, ETC 120
- ELECTRICAL 121
- Open-circuit voltage (V) 122
- CAUTION: 125
- CHECKING THE FUSES 126
- ADJUSTING THE HEADLIGHT BEAM/ 128
- CHANGING THE HEADLIGHT BULB 128
- CHANGING THE HEADLIGHT BULB/ 129
- 7 Nm (0.7 m 130
- ENGINE REMOVAL 131
- 10 Nm (1.0 m 134
- CYLINDER HEAD COVER 139
- ROCKER ARMS 143
- CAMSHAFT AND CYLINDER HEAD 147
- VALVES AND VALVE SPRINGS 155
- CYLINDER AND PISTON 163
- Order Job/Part Q’ty Remarks 172
- 18 Starter idle gear 1 172
- PRIMARY AND SECONDARY SHEAVES 182
- CRANKCASE 196
- CRANKSHAFT AND OIL PUMP 203
- TRANSMISSION 209
- MIDDLE GEAR 215
- COOLING SYSTEM 229
- 11 Coolant reservoir 1 230
- WATER PUMP 234
- OIL COOLER 238
- FUEL SYSTEM 241
- FUEL PUMP AND FUEL TANK 242
- CARBURETOR 244
- DRIVE TRAIN 252
- GEAR AND DRIVE SHAFT 255
- DRIVE SHAFT 255
- 13 Passenger seat support 1 291
- FRONT WHEELS AND BRAKE DISCS 296
- REAR WHEELS AND BRAKE DISC 300
- FRONT AND REAR BRAKES 304
- 9 Nm (0.9 m 311
- 16 Nm (1.6 m 329
- PEDAL ASSEMBLY 330
- STEERING SYSTEM 331
- 40 Nm (4.0 m 332
- 10 Circlip 1 343
- 11 Ball joint 1 343
- REAR KNUCKLE AND STABILIZER 348
- ELECTRICAL COMPONENTS 354
- CHECKING THE SWITCH 355
- CHECKING THE BULBS AND 358
- BULB SOCKETS 358
- IGNITION SYSTEM 361
- ELECTRIC STARTING SYSTEM 367
- CHARGING SYSTEM 375
- LIGHTING SYSTEM 378
- SIGNALING SYSTEM 384
- 2WD/4WD SELECTING SYSTEM 403
- CARBURETOR HEATING SYSTEM 408
- POOR IDLE SPEED PERFORMANCE 413
- FAULTY DRIVE TRAIN 414
- FAULTY GEAR SHIFTING/ 415
- FAULTY CLUTCH PERFORMANCE 415
- FAULTY GEAR SHIFTING 415
- OVERHEATING 416
- FAULTY BRAKE 416
- SHOCK ABSORBER MALFUNCTION 416
- UNSTABLE HANDLING/ 417
- UNSTABLE HANDLING 417
- PRINTED IN U.S.A 420
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