Cylinder Head Installation - Honda NSS250S Manual

CYLINDER HEAD/VALVES
Install the valve springs with the tightly wound coils
facing the combustion chamber.
Install the spring retainer.
Install the valve spring cotters using spring com-
Grease the cotters
pressor.
to ease installation.
To prevent loss of
TOOLS:
tension, do not
Valve spring compressor
compress the valve
Valve spring compressor attach-
spring more than
ment
necessary to install
the cotters.
• Support the cylinder head above the work bench
surface to prevent possible valve damage.
Tap the valve stems gently with plastic hammer and
shaft as shown to seat the cotters firmly.
Install the following:
– Cylinder head (page 9-20)
– O sensor (page 6-107)
2
– Thermostat (page 7-10)
– Spark plug (page 4-7)
– ECT sensor (page 6-92)

CYLINDER HEAD INSTALLATION

Clean the mating surfaces of the cylinder and cylin-
Be careful not to
der head thoroughly.
damage the mating
Blow through the oil passage in the cylinder head
surfaces.
with compressed air.
Install the tip of the cam chain guide to the crank-
case groove by aligning it bosses with the grooves
in the cylinder.
9-20
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VALVE COMPRESSOR
ATTACHMENT
CAM CHAIN GUIDE
GROOVE
CAM CHAIN
COTTERS
Align