7-1
TROUBLESHOOTING
TROUBLESHOOTING
EAS28450
TROUBLESHOOTING
EAS28460
GENERAL INFORMATION
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 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
•
Deteriorated or contaminated fuel
• Clogged fuel tank cap breather hole
• Clogged or damaged fuel hose
2. Fuel pump
• Faulty fuel pump
•
Clogged fuel pump filter
3. Throttle body
• Deteriorated or contaminated fuel
•
Sucked-in air
4. Canister
• Hose clogged
•
Hose band / twisted
Electrical system
1. Battery
• Discharged battery
•
Faulty battery
2. Fuse(s)
• 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 AC magneto rotor woodruff key
6. Switches and wiring
• Faulty main switch
•
Faulty engine stop switch
• Broken or shorted wiring
• Faulty neutral switch
• Faulty front, rear or both brake light switches
• Faulty start switch
• Faulty sidestand switch
• Faulty clutch switch
• Improperly grounded circuit
• Loose connections
7. Starting system
• Faulty starter motor
•
Faulty starter relay
• Faulty starter clutch
EAS28490
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
• Damaged or loose throttle body joint
•
Improperly adjusted engine idling speed (idle
adjusting screw)
• Improper throttle cable free play
• Flooded throttle body
• Faulty air induction system
B9X-F8197-E0.book Page 1 Thursday, July 16, 2020 2:28 PM
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