Cylinder Head Assembly - Honda NSS250S Manual

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After cutting the seat, apply lapping compound to

the valve face, and lap the valve using light pres-

• Excessive lapping pressure may deform or dam-

age the seat.

• Change the angle of the lapping tool frequently

to prevent uneven seat wear.

• Lapping compound can cause damage if it enters

between the valve stem and guide.

After lapping, wash any residual compound off the

cylinder head and valve and recheck the seat con-

CYLINDER HEAD ASSEMBLY

VALVE COTTER

VALVE SPRING

Blow through the oil passage in the cylinder head

with compressed air.

Apply oil to the inner surface of new valve stem

Install the spring seats and new valve stem seals.

Lubricate the valve stem sliding surface with molyb-

denum oil solution.

Insert the valves into the valve guide while turning it

slowly to avoid damage to the valve stem seal.

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INTAKE VALVE

CYLINDER HEAD/VALVES

HAND-LAPPING TOOL

EXHAUST VALVE

VALVE SPRING

VALVE SPRING SEAT

SPRING RETAINER

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