9.1
9.2
TROUBLESHOOTING
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.
STARTING FAILURES
Engine
1. Cylinder 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 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
• Deteriorated or contaminated fuel
2. Fuel pump
• Faulty fuel pump
• Faulty fuel pump relay
3. Throttle body
• Deteriorated or contaminated fuel
• Sucked-in air
Electrical system
1. Battery
• Discharged battery
• Faulty battery
2. Fuse
• Blown, damaged or incorrect fuse
• Improperly installed fuse
3. Spark plug
• 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
• 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 magneto 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 clutch switch
• Improperly grounded circuit
• Loose connections
7. Starting system
• Faulty starter motor
• Faulty starter relay
• Faulty starting circuit cut-off relay
• Faulty starter clutch
INCORRECT ENGINE IDLING SPEED
Engine
1. Cylinder and cylinder head
• Incorrect valve clearance
• Damaged valve train components
2. Air filter
• Clogged air filter element
Fuel system
1. Throttle body
• Damage or loose throttle body joint
• Improper throttle cable free play
• Flooded throttle body
• Faulty air induction system
TROUBLESHOOTING
TROUBLESHOOTING
Electrical system
1. Battery
• Discharged battery
• Faulty battery
2. Spark plug
• Incorrect spark plug gap
• Incorrect spark plug heat range
• Fouled spark plug
• Worn or damaged electrode
• Worn or damaged insulator
• Faulty spark plug cap
3. Ignition coil
• Broken or shorted primary or secondary coils
• Faulty spark plug lead
• Cracked or broken ignition coil
4. Ignition system
• Faulty ECU
• Faulty crankshaft position sensor
• Broken magneto rotor woodruff key
POOR MEDIUM-AND-HIGH-SPEED
PERFORMANCE
Refer to “STARTING FAILURES ” on page 9-1.
Engine
1. Air filter
• Clogged air filter element
Fuel system
1. Fuel pump
• Faulty fuel pump
FAULTY GEAR SHIFTING
Shifting is difficult
Refer to “Clutch drags”.
SHIFT PEDAL DOES NOT MOVE
Shift shaft
• Bent shift shaft
Shift drum and shift forks
• Foreign object in a shift drum groove
• Seized shift fork
• Bent shift fork guide bar
Transmission
• Seized transmission gear
• Foreign object between transmission gears
• Improperly assembled transmission
JUMPS OUT OF GEAR
Shift shaft
• Incorrect shift pedal position
• Improperly returned stopper lever
Shift forks
• Worn shift fork
Shift drum
• Incorrect axial play
• Worn shift drum groove
Transmission
• Worn gear dog
FAULTY CLUTCH
Clutch slips
1. Clutch
• Improperly assembled clutch
• Improperly adjusted clutch cable
• Loose or fatigued clutch spring
• Worn friction plate
• Worn clutch plate
2. Engine oil
• Incorrect oil level
• Incorrect oil viscosity (low)
• Deteriorated oil
Clutch drags
1. Clutch
• Unevenly tensioned clutch springs
• Warped pressure plate
• Bent clutch plate
• Swollen friction plate
• Bent clutch push rod
• Broken clutch boss
• Burnt primary driven gear bushing
2. Engine oil
• Incorrect oil level
• Incorrect oil viscosity (high)
• Deteriorated oil
OVERHEATING
Engine
1. Clogged coolant passages
• Cylinder head and piston
• Heavy carbon buildup
2. Engine oil
• Incorrect oil level
Содержание YZF-R15
Страница 1: ...2008 SERVICE MANUAL YZF R15 20P F8197 E0 ...
Страница 33: ...2 14 ELECTRICAL SPECIFICATIONS Coil resistance 54 0 66 0 Fuse 20 0A Ω Fuse ...
Страница 46: ...2 27 LUBRICATION POINTS AND LUBRICANT TYPES LUBRICATION DIAGRAMS A 1 2 3 4 5 6 7 ...
Страница 48: ...2 29 LUBRICATION POINTS AND LUBRICANT TYPES 1 2 3 4 ...
Страница 49: ...2 30 LUBRICATION POINTS AND LUBRICANT TYPES 1 Camshaft 2 Crankshaft 3 Main axle 4 Drive axle ...
Страница 50: ...2 31 COOLING SYSTEM DIAGRAMS COOLING SYSTEM DIAGRAMS 1 2 3 4 1 5 7 6 4 ...
Страница 52: ...2 33 CABLE ROUTING CABLE ROUTING 1 5 2 3 6 4 8 7 ...
Страница 54: ...2 35 CABLE ROUTING A A B B C C A A C C B B A B C 1 2 3 4 5 4 5 6 6 7 8 9 10 11 10 11 12 12 ...
Страница 56: ...2 37 CABLE ROUTING 1 2 5 4 3 ...
Страница 60: ...2 41 CABLE ROUTING A A B C D E 1 2 3 4 5 6 7 8 9 10 A ...
Страница 121: ...4 24 FRONT BRAKE Refer to BLEEDING THE HYDRAULIC BRAKE SYSTEM on page 3 18 ...
Страница 249: ...7 8 THROTTLE BODY ...
Страница 250: ...7 9 AIR INDUCTION SYSTEM AIR INDUCTION SYSTEM 1 2 5 4 5 6 3 2 1 6 4 3 ...
Страница 257: ......
Страница 269: ...8 12 CHARGING SYSTEM 1 AC magneto 2 Rectifier regulator 3 Battery 42 Fuse ...
Страница 271: ...8 14 CHARGING SYSTEM ...
Страница 275: ...8 18 LIGHTING SYSTEM ...
Страница 285: ...8 28 COOLING SYSTEM ...
Страница 309: ...8 52 FUEL PUMP SYSTEM 3 Battery 10 Main switch 11 ECU engine control unit 19 Fuel pump 42 Fuse 43 Stop switch ...
Страница 311: ...8 54 FUEL PUMP SYSTEM ...
Страница 312: ...8 55 ELECTRICAL COMPONENTS ELECTRICAL COMPONENTS 1 4 8 17 23 2 3 5 6 7 9 10 11 12 13 14 15 16 18 19 20 21 22 ...