TROUBLESHOOTING
8-1
EAS28450
TROUBLESHOOTING
EAS28460
GENERAL INFORMATION
NOTE:
The following guide for troubleshooting does not
cover all the possible causes of trouble. It should
be helpful, however, as a guide to basic trouble-
shooting. Refer to the relative procedure in this
manual for checks, adjustments, and replace-
ment of parts.
EAS28470
STARTING FAILURES
Engine
1. Cylinder(s) and cylinder head(s)
• Loose spark plug
• Loose cylinder head or cylinder
• Damaged cylinder head gasket
• Damaged cylinder gasket
• Worn or damaged cylinder
• Incorrect valve clearance
• Improperly sealed valve
• Incorrect valve-to-valve-seat contact
• Incorrect valve timing
• Faulty valve spring
• Seized valve
2. Piston(s) and piston ring(s)
• Improperly installed piston ring
• Damaged, worn or fatigued piston ring
• Seized piston ring
• Seized or damaged piston
3. Air filter
• Improperly installed air filter
• Clogged air filter element
4. Crankcase and crankshaft
• Improperly assembled crankcase
• Seized crankshaft
Fuel system
1. Fuel tank
• Empty fuel tank
• Clogged fuel filter
• Clogged fuel tank overflow/breather hose
• Clogged rollover valve
• Clogged rollover valve hose
• Deteriorated or contaminated fuel
2. Fuel pump
• Faulty fuel pump
• Faulty relay unit (fuel pump relay)
3. Throttle body(-ies)
• Deteriorated or contaminated fuel
• Sucked-in air
Electrical system
1. Battery
• Discharged battery
• Faulty battery
2. Fuse(s)
• Blown, damaged or incorrect fuse
• Improperly installed fuse
3. Spark plug(s)
• Incorrect spark plug gap
• Incorrect spark plug heat range
• Fouled spark plug
• Worn or damaged electrode
• Worn or damaged insulator
• Faulty spark plug cap
4. Ignition coil(s)
• Cracked or broken ignition coil body
• Broken or shorted primary or secondary coils
• Faulty spark plug lead
5. Ignition system
• Faulty ECU
• Faulty crankshaft position sensor
• Broken generator rotor woodruff key
6. Switches and wiring
• Faulty main switch
• Faulty engine stop switch
• Broken or shorted wiring
• Faulty neutral switch
• Faulty start switch
• Faulty sidestand switch
• Faulty clutch switch
• Improperly grounded circuit
• Loose connections
7. Starting system
• Faulty starter motor
• Faulty starter relay
• Faulty relay unit (starting circuit cut-off relay)
• Faulty starter clutch
EAS28490
INCORRECT ENGINE IDLING SPEED
Engine
1. Cylinder(s) and cylinder head(s)
• Incorrect valve clearance
• Damaged valve train components
2. Air filter
• Clogged air filter element
Fuel system
1. Throttle body(-ies)
• Damaged or loose throttle body joint
• Improperly synchronized throttle bodies
Summary of Contents for XV19CTMX(C)
Page 6: ......
Page 8: ......
Page 46: ...ELECTRICAL SPECIFICATIONS 2 19 Spare fuse 3 0 A ...
Page 63: ...LUBRICATION POINTS AND LUBRICANT TYPES 2 36 ...
Page 68: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 41 D D B B D D C C A A B C C B 3 2 1 3 4 6 7 6 7 5 ...
Page 70: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 43 A A A A 1 3 2 4 ...
Page 72: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 45 A 1 2 3 4 ...
Page 74: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 47 A A A 1 5 5 1 3 2 4 B B B B ...
Page 76: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 49 1 2 ...
Page 77: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 50 1 Transfer gear oil pump 2 Middle driven shaft ...
Page 110: ...CABLE ROUTING for XV19CS C XV19C C 2 83 ...
Page 113: ......
Page 150: ...ELECTRICAL SYSTEM 3 37 ...
Page 179: ...FRONT WHEEL 4 26 ...
Page 218: ...HANDLEBAR 4 65 Throttle cable free play 4 0 6 0 mm 0 16 0 24 in ...
Page 330: ...GENERATOR AND STARTER CLUTCH 5 81 ...
Page 368: ...TRANSMISSION 5 119 ...
Page 391: ......
Page 397: ...IGNITION SYSTEM 7 6 ...
Page 405: ...CHARGING SYSTEM 7 14 1 AC magneto 2 Rectifier regulator 4 Main fuse 6 Battery ...
Page 407: ...CHARGING SYSTEM 7 16 ...
Page 460: ...ELECTRICAL COMPONENTS 7 69 16 18 2 11 13 9 8 10 12 14 15 17 1 3 4 5 6 7 ...
Page 490: ......
Page 491: ......
Page 492: ...YAMAHA MOTOR CO LTD 2500 SHINGAI IWATA SHIZUOKA JAPAN ...