Yamaha R1 Series 2015, Service Manual

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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 FAILURES
Engine
1. Cylinder(s) and cylinder head(s)
• Loose spark plug
•
Loose cylinder head or cylinder
• Damaged cylinder head 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 cap breather hose
•
Deteriorated or contaminated fuel
• Clogged or damaged fuel hose
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
4. Ignition coil(s)
• Cracked or broken ignition coil body
•
Broken or shorted primary or secondary coils
5. Ignition system
•
Faulty ECU
• Faulty crankshaft position sensor
•
Broken generator rotor woodruff key
6. Switches and wiring
•
Faulty main switch
• Faulty start/engine stop switch
•
Broken or shorted wiring
• Faulty neutral 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
EAS30601
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
• Improper throttle grip free play
• Flooded throttle body
•
Faulty air induction system
Electrical system
1. Battery
• Discharged battery
• Faulty battery
2. Spark plug(s)
•
Incorrect spark plug gap
•
Incorrect spark plug heat range
• Fouled spark plug