Cylinder Head/Valves - Tools Needed; Cylinder Head/Valves Troubleshooting - DAELIM ROADWIN VJ125 Service Manual

CYLINDER HEAD / VALVES
TOOLS
VALVE GUIDE REAMER
VALVE GUIDE DRIVER
VALVE SPRING COMPRESSOR
VALVE SEAT CUTTER
SEAT CUTTER IN 35 (23mm)
EX 35 (20mm)
IN 45 (24.5mm)
EX 45 (24.5mm)
IN 60 (22mm)
EX 60 (22mm)
CUTTER HOLDER 5mm
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)
- Burned or bent valves
- Incorrect valve timing
- Broken valve spring
- Uneven valve seating
Cylinder head
- Leaking or damage head gasket
- Warped or cracked cylinder head
Cylinder, piston (see section 9)
Excessive white smoke
Worn valve guide or valve stem
Damaged valve stem seal
Worn or damaged piston ring
9-2
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
Worn rocker arm and / or shaft
Loose or worn cam chain
Worn or damaged cam chain tensioner
Damaged cylinder head gasket
Incorrect spark plug installation