CPI GTR180 Service Manual page 49

CPI MOTOR
VII.CYLINDER HEAD & CAM SHAFT REMOVAL
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 Abnormal noise
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
ABNORMAL NOISE
Incorrect valve clearance adjustment
Sticking valve or broken valve spring
Damaged or worn camshaft
Worn cam chain tensioner
Worn camshaft and rocker arm
Warped or cracked cylinder head
Poorly installed spark plug
COMPRESSION TOO HIGH
Excessive carbon build-up in combustion chamber
TORQUE
CYLINDER HEAD NUT
CYLINDER HEAD COVER BOLT 1.0~1.4kgf-m
CAM CHAIN WHEEL BOLT
2.0~2.4kgf-m TAPPET ADJUSTING NUT
PLUG
1.0~1.4kgf-m
GTR180
0.7~1.1kgf-m
1.0~1.2kgf-m