Troubleshooting - Honda VT750C2 Shadow Spirit Service Manual

CYLINDER HEAD/VALVE
TROUBLESHOOTING
Engine top-end problems usually affect engine performance. These can be diagnosed by a compression test, or by tracing
top-end noise with a sounding rod or stethoscope.
Compression too low, hard starting or poor performance at low speed
• Valves
- Incorrect valve adjustment
- Burned or bent valves
- Incorrect valve timing
- Broken valve spring
- Uneven valve seating
- Valve stuck open
• Cylinder head
- Leaking or damaged cylinder head gasket
- Warped or cracked cylinder head
- Loose sparkphig
• Cylinder/piston problem (page 10-3)
Compr'lfsion too high
• Excessive
carb(~n
build-up on piston head or combustion chamber
Exce~sivesmOke""
• Worn .valv:estem or valve guide
• Damaged stem seal
• Cylinder/piston problem (page 10-3)
Excessive noise
• Incorrect valve clearance
• Sticking valve or broken valve spring
• Excessive worn valve seat
• Worn or damaged camshaft
• Worn or damaged rocker arm and/or shaft
• Worn rocker arm follower or valve stem end
• Worn cam sprocket teeth
• Worn cam chain
• Worn or damaged cam chain tensioner
• Cylinder/piston problem (page 10-3)
Rough idle
• Low cylinder compression
9-5