Troubleshooting - KYMCO K-XCT 125i Service Manual

6
. CYLINDER HEAD/VALVES
SPECIAL TOOLS
Valve spring compressor

TROUBLESHOOTING

 The poor cylinder head operation can be diagnosed by a compression test or by tracing engine
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
6-3
A120E00040
White smoke from exhaust muffler
 Worn valve stem or valve guide
 Damaged valve stem oil seal
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
K-XCT 125i