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6. CYLINDER HEAD/VALVES K-PIPE 125
TROUBLESHOOTING
· The poor cylinder head operation can be diagnosed by a compression test or by tracing engine
top-end noises.
Poor performance at idle speed White smoke from exhaust muffler
· Compression too low · Worn or broken valve stem or valve guide
· Damaged valve stem seal
Compression too low
· Incorrect valve clearance (too small)
· Burned or bend valves Abnormal noise
· Incorrect valve timing · Incorrect valve clearance (too large)
· Broken valve spring · Burned valve or rocker arm
· Poor valve and seat contact · Worn camshaft or cam follower
· Leaking cylinder head gasket
· Warped or cracked cylinder head
· Poorly installed spark plug
Compression too high
· Excessive carbon build-up in combustion
chamber or on piston head
6-3