Cylinder Head Assembly - Honda Metropolitan CHF50 Service Manual

CYLINDER HEAD/VALVES
Excessive lapping
pressure may
deform or damage
the seat,
Do not allow
lapping compound
to enter the guides.
After cutting the seat, apply lapping compound to
the valve face, and lap the valve using light pres-
sure.
Change the angle of the lapping tool frequently to
prevent uneven seat wear.
After lapping, wash any residual compound off the
cylinder head and valve and recheck the seat con-
tact.
LAPPING TOOL
CYLINDER HEAD ASSEMBLY
SPARK PLUG
THERMOSENSOR
COTTER
SHIM
1
\
RETAINER
SPRING
EXHAUST VALVE
SPRING SEAT
STEM SEAL
VALVE GUIDE
Blow out the oil passage in the cylinder head with
compressed air.
Apply engine oil to the inner surface of new stem
seals.
Install the spring seats and stem seals.
Lubricate the valve stem sliding surface with molyb-
denum oil solution.
Insert the valves into the guide while turning it
slowly to avoid damage to the stem seal.
SPRING
RETAINER
STEM SEAL
8-17