Cylinder Head Disassembly - Honda NSS250S Manual

Remove the cam chain guide.

CYLINDER HEAD DISASSEMBLY

Remove the following:
– ECT sensor (page 6-92)
– Spark plug (page 4-7)
– Thermostat (page 7-10)
– O sensor (page 6-107)
2
– Cylinder head (page 9-11)
Remove the valve spring cotters using the valve
To prevent loss of
spring compressor.
tension, do not
compress the valve
TOOLS:
springs more than
Valve spring compressor
necessary to
Valve spring compressor attach-
remove the cotters.
ment
Remove the following:
Mark all parts
during disassembly
– Spring retainer
so they can be
– Valve spring
placed back in their
– Valve
original locations.
– Valve stem seal
– Valve spring seat
INSPECTION
CYLINDER HEAD
Remove the carbon deposits from the combustion
Avoid damaging the
chamber and clean off the head gasket surface.
mating and valve
seat surfaces.
Check the spark plug hole and valve area for cracks.
Replace the cylinder head if necessary.
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07959-KM30101
CYLINDER HEAD/VALVES
CAM CHAIN GUIDE
VALVE COMPRESSOR
ATTACHMENT
VALVE SPRING
VALVE STEM SEAL
VALVE SPRING SEAT
COMBUSTION CHAMBER
COTTERS
SPRING RETAINER
COTTERS
9-13