Honda NSS250A Reflex 2001-2007, Manual

Page: 307 / 718

CYLINDER HEAD/VALVES
9-13
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
2
sensor (page 6-107)
– Cylinder head (page 9-11)
Remove the valve spring cotters using the valve
spring compressor.
Mark all parts
during disassembly
so they can be
placed back in their
original locations.
Remove the following:
– Spring retainer
– Valve spring
– Valve
– Valve stem seal
– Valve spring seat
INSPECTION
CYLINDER HEAD
Avoid damaging the
mating and valve
seat surfaces.
Remove the carbon deposits from the combustion
chamber and clean off the head gasket surface.
Check the spark plug hole and valve area for cracks.
Replace the cylinder head if necessary.
CAM CHAIN GUIDE
To prevent loss of
tension, do not
compress the valve
springs more than
necessary to
remove the cotters.
TOOLS:
Valve spring compressor
07757-0010000
Valve spring compressor attach-
ment
07959-KM30101
VALVE COMPRESSOR
ATTACHMENT COTTERS
COTTERS
SPRING RETAINER
VALVE SPRING
STEM SEAL VALVE
VALVE SPRING SEAT
COMBUSTION CHAMBER
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