TROUBLESHOOTING
9-1
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.
EAS28480
STARTING FAILURE/HARD STARTING
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 tank cap breather hole
● Deteriorated or contaminated fuel
● Clogged or damaged fuel hose
2. Fuel pump
● Faulty fuel pump
● Faulty fuel pump relay
3. Throttole body
● 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 (engine)
● Faulty crankshaft position sensor
6. Switches and wiring
● Faulty main switch
● Faulty engine stop switch
● Broken or shorted wiring
● Faulty front, rear or both brake light switches
● Faulty start switch
● Faulty sidestand switch
● Improperly grounded circuit
● Loose connections
● Faulty lean angle sensor
7. Starting system
● Faulty starter motor
● Faulty starter relay
● Faulty starting circuit cut-off relay
● Faulty starter clutch
EAS28500
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
● Damaged or loose throttle body joint
● Improperly synchronized throttle bodies
● Improperly adjusted engine idling speed (idle
adjust screw)
● Improper throttle cable free play
● Flooded throttle body
Electrical system
1. Battery
● Discharged battery
● Faulty battery
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