Cylinder Head/Valves - KYMCO AGILITY 125 Service Manual

7

. CYLINDER HEAD/VALVES

TORQUE VALUES
Cylinder head nut
Valve clearance adjusting nut
SPECIAL TOOLS
Valve spring compressor
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
Compression too low
Compression too low
Incorrect valve clearance adjustment
Burned or bend valves
Incorrect valve timing
Broken valve spring
Poor valve and seat contact
Leaking cylinder head gasket
Warped or cracked cylinder head
Poorly installed spark plug
Compression too high
Excessive carbon build-up in combustion
chamber
1.8~2.2kgf-m
0.7~1.1kgf-m
White smoke from exhaust muffler
Abnormal noise
AGILITY
Apply engine oil to threads
Apply engine oil to threads
Worn valve stem or valve guide
Damaged valve stem seal
Incorrect valve clearance adjustment
Sticking valve or broken valve spring
Damaged or worn camshaft
Worn cam chain guide
Worn camshaft and rocker arm
50
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