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Over shifts:
Shift arm positioning bole spring weak or broken
Shift tie-rod maladjusted
Abnormal Engine Noise:
Knocking:
CDI unit trouble
Carbon built up in combustion chamber
Fuel poor quality or incorrect
Spark plug incorrect
Overheating
Piston Slap:
Cylinder/piston clearance excessive
Cylinder, piston holes worn
Connecting rod bent
Piston pin, piston holes worn
Valve noise:
Valve clearance incorrect
Valve spring broken or weak
Camshaft bearing worn
Rocker arm worn
Other noise:
Connecting rod small end clearance excessive
Connecting rod big end clearance excessive
Piston ring worn, broken, or stuck
Piston seizure, damage
Cylinder head gasket leaking
Exhaust pipe leaking at cylinder head connection
Crankshaft runout excessive
Engine mounts loose
Crankshaft bearing worn
Camshaft chain pensioner trouble
Camshaft chain, sprocket, guides worn
Balancer bearing worn
Balancer gear worn or shipped
Loose alternator rotor
Abnormal Drive Train Noise:
Converter noise:
Belt worn
Drive or driven pulley sheave worn
Drive or driven pulley movable sheave bush worn
Drive or driven pulley mount loose.
Drive pulley shoe worn
Drive pulley weight or roller side washer worn
Drive pulley weight or roller worn
Wear guides worn
Transmission noise:
Bearing worn
Transmission gears worn or chipped
Metal chips jammed in gear teeth
Engine oil insufficient or too thin
Front or rear final gear case noise:
Insufficient lubricant
Incorrect oil (Front final gear case)
Bevel gear bearings worn
Bevel gears worn or chipped
Bevel gears maladjusted
Front axle or propeller shaft noise:
Constant velocity universal joint damaged
APPENDIX
Abnormal Frame Noise:
Shock absorber noise:
Shock absorber damaged
Disc brake noise:
Pad installed incorrectly
Pad surface glazed
Disc warped
Caliper trouble
Other noise:
Bracket, nut bolt, etc. not properly mounted or
tightened.
Exhaust Smokes Excessively:
White smoke:
Piston oil ring worn
Cylinder worn
Valve oil seal damaged
Valve guide worn
Cylinder head gasket damaged
Engine oil level to high
Black Smoke:
Air cleaner clogged
Main jet too large or fallen off
Starter plunger stuck open
Fuel level too high
Brown smoke:
Main jet too small
Fuel level too low
Air cleaner duct loose
Air cleaner poorly sealed or missing
Handing and/or stability Unsatisfactory
Handlebar hard to turn:
Tire air pressure too low
Steering stem bearing damaged
Steering stem bearing lubrication inadequate
Steering stem bent
Damaged steering knuckle joint
Damage tie-rod end
Handlebar shakes or excessively vibrates:
Tire worn
Wheel rim warped
Rear axle runout excessive
Wheel bearing worn
Handlebar clamp loose
Handlebar pulls to one side:
Frame bent
Wheel maladjustment
Suspension arm bent or twisted
Steering stem bent
Front or rear tire air pressure unbalanced
Front shock absorber unbalanced
Shock absorption unsatisfactory:
Too hard:
Tire air pressure too high
Shock absorber maladjusted
Too soft:
Shock absorber oil leaking
Shock absorber spring weak
Tire air pressure too low
Shock absorber maladjusted
【8-9】
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