Kawasaki KX250F - Owner's Manual - page 183
182
j
Engine noise abnormal -
Knocking:
•
Carbon built up in combustion chamber
•
Fuel quality poor or type incorrect
•
Spark plug type incorrect
•
Engine overheating
•
ECU defective
Piston slap:
•
Piston clearance excessive
•
Cylinder or piston worn
•
Connecting rod bent
•
Piston pin or piston pin holes worn
Valve noise:
•
Valve clearance incorrect
•
Valve spring broken or weak
•
Camshaft bearing or cam face worn
•
Valve lifter worn
Other noise:
•
Connecting rod small end clearance excessive
•
Connecting rod big end clearance excessive
•
Piston ring worn, broken or stuck
•
Piston seized or damaged
•
Cylinder head gasket leaking
•
Exhaust pipe leaking at cylinder head
•
Crankshaft runout excessive
•
Engine mounts loose
•
Crankshaft bearing worn
•
Primary gear worn or chipped
•
Camshaft chain tensioner defective
•
Camshaft chain, sprocket, chain guide worn
•
Decompression spring broken
•
Flywheel magneto loose
Abnormal drive train noise -
Clutch noise:
•
Clutch housing/friction plate clearance excessive
•
Clutch housing gear excessive
•
Metal chip jammed in clutch housing gear teeth
Transmission noise:
•
Crankcase bearing worn or damaged
•
Transmission gear worn or chipped
•
Metal chip jammed in gear teeth
•
Engine oil level or viscosity too low
•
Kick ratchet gear not properly disengaging from
kick gear
•
Kick shaft idle gear worn or chipped
Drive chain noise:
•
Drive chain slack improperly adjusted
•
Drive chain worn
•
Rear and/or engine sprocket(s) worn
•
Drive chain inefficiently lubricated
•
Rear wheel misaligned
Frame noise abnormal -
Front fork noise:
•
Oil level or viscosity too low
•
Spring broken or weak
•
Front fork air pressure high