TROUBLESHOOTING
9-1
EAS20090
TROUBLESHOOTING
EAS30599
GENERAL INFORMATION
TIP
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.
EAS30600
STARTING FAILURE
Engine
1. Cylinder(s) and cylinder head
• 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 tank breather hose
• Clogged fuel tank overflow hose
• Deteriorated or contaminated fuel
• Clogged or damaged fuel hose
2. Fuel pump
• Faulty fuel pump
• Clogged overflow filter
• 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 straight key
6. Switches and wiring
• Faulty main switch
• Faulty engine stop switch
• Broken or shorted wiring
• Faulty gear position sensor
• 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
EAS30601
INCORRECT ENGINE IDLING SPEED
Engine
1. Cylinder(s) and cylinder head
• 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
• Faulty ISC (idle speed control) valve
• Improperly synchronized throttle bodies
• Improper throttle grip free play
Содержание YZF-R25
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Страница 25: ...BASIC SERVICE INFORMATION 1 16 ...
Страница 32: ...SPECIAL TOOLS 1 23 ...
Страница 49: ...TIGHTENING TORQUES 2 16 2 6 8 5 4 1 2 6 3 7 2 10 9 A ...
Страница 61: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 28 Oil pump right side view 1 2 1 Oil pump 2 Relief valve ...
Страница 66: ...COOLING SYSTEM DIAGRAMS 2 33 EAS20020 COOLING SYSTEM DIAGRAMS 1 2 3 1 5 4 4 ...
Страница 67: ...COOLING SYSTEM DIAGRAMS 2 34 1 Radiator 2 Radiator outlet hose 3 Water pump 4 Thermostat 5 Radiator inlet hose ...
Страница 99: ......
Страница 128: ...PERIODIC MAINTENANCE 3 29 ...
Страница 146: ...GENERAL CHASSIS 5 4 15 1 b b a a 2 ...
Страница 200: ...FRONT FORK 4 69 2 b a 1 ...
Страница 209: ...SWINGARM AND REAR SHOCK ABSORBER ASSEMBLY 4 78 2 1 1 1 a A B ...
Страница 214: ...CHAIN DRIVE 4 83 ...
Страница 227: ...ENGINE REMOVAL 5 10 T R Exhaust pipe protector bolt 8 Nm 0 8 m kgf 5 8 ft lbf LOCTITE 9 8 4 7 6 1 5 3 2 ...
Страница 256: ...CYLINDER AND PISTONS 5 39 1 ...
Страница 310: ...TRANSMISSION 5 93 ...
Страница 322: ...WATER PUMP 6 11 ...
Страница 336: ...THROTTLE BODIES 7 13 c 1 cylinder d 2 cylinder A Left B Right b a d c A B b 1 ...
Страница 337: ...THROTTLE BODIES 7 14 ...
Страница 338: ...AIR INDUCTION SYSTEM 7 15 EAS20071 AIR INDUCTION SYSTEM 1 2 3 4 5 1 2 ...
Страница 342: ...AIR INDUCTION SYSTEM 7 19 ...
Страница 345: ......
Страница 355: ...ELECTRIC STARTING SYSTEM 8 10 ...
Страница 359: ...CHARGING SYSTEM 8 14 ...
Страница 371: ...SIGNALING SYSTEM 8 26 ...
Страница 417: ...FUEL PUMP SYSTEM 8 72 ...
Страница 418: ...ELECTRICAL COMPONENTS 8 73 EAS20089 ELECTRICAL COMPONENTS 2 1 3 4 6 5 8 7 17 18 15 16 14 13 12 11 10 9 20 19 ...
Страница 420: ...ELECTRICAL COMPONENTS 8 75 2 3 4 5 12 11 10 9 8 7 1 6 ...
Страница 440: ...ELECTRICAL COMPONENTS 8 95 ...
Страница 451: ...SELF DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE 9 10 ...
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