DAELIM Roadwin 250R FI VJF125, Service Manual

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10-2
CYLINDER HEAD / VALVES
TOOLS
VALVE GUIDE REAMER
VALVE GUIDE DRIVER
VALVE SPRING COMPRESSOR
VALVE SEAT CUTTER
TROUBLESHOOTING
Enging top-end problems useally affect engine performance. These can be diagnosed by a compression or leak down test,
or by tracing noises to the top-end with a sounding rod or stethoscope.
Low comperssion
Valves
- Incorrect valve adjustment (see section 3)
- Valve springs damage
- Incorrect valve timing
- Uneven valve seating
Cylinder head
- Leaking or damage head gasket
- Warped or cracked cylinder head
Cylinder, piston (see section 10,11)
Excessive white smoke
Worn valve guide or valve stem
Damaged valve stem seal
Worn or damaged piston ring
Rough idle
Low cylinder compression
Compression too high
Excessive carbon build-up on piston or combustion
chamber
Excessive noise
Incorrect valve adjustment
Sticking valve or broken valve spring
Damaged or worn camshaft
Loose or worn cam chain
Worn or damaged cam chain tensioner