Valve Seat Cutter; Cylinder Head/Valves Troubleshooting - Honda 1988 Z50R Service Manual

CYLINDER HEAD/VALVES
TOOLS
Special
Valve spring compressor attachment
Valve guide driver, S.Omrn
Valve guide reamer, S.Omm
Common
Valve spring compressor
VALVE SEAT CUTTER
VALVE SEAT CUTTER
Seat cutter 24 mm (45 " IN , EX )
Seat cutter 19 mm (32 " EX)
Seat cutter 21 .5 mm (32
0
IN)
Seat cutter 22 mm (60" IN , EX)
Cuner holder 5 mm
TROUBLESHOOTING
07959-KM30101
07942-MASOOOO
07984-MASOOOC
07757·0010000
07780-0010600
r
or equivalent commercially available in U.S .A.
07780-0012700
07780-00' 2800
07780-0014202
07781 ·0010400
Engine top -end problems are usually performance-related and can usually be diagnosed by a compression test.
Engine noises can usually be traced to the top -end with a sounding rod or stethoscope .
l ow compression
Valves
- Incorrect valve adjustment
- Burned or bent valve stem
- Incorrect valve timing
- Broken ,:,alve spring
- Worn or damaged valve stem seal
- Worn or damaged valve guide
Cylinder head
- Leaking or damaged head gasket
- Warped or cracked cylinder head
Cylinder and piston (Refer to Section 7)
High Compression
Excessive carbon build-up on piston crown or combustion
chamber
Excessive Noise
Incorrect valve adjustment
Sticking valve or broken valve spring
Damaged or worn rocker arm or camshaft
loose or worn cam chain
Worn or damaged cam chain tensioner
Worn cam sprocket teeth
Poor Idling
• Compression too low
6 -2