4. DISASSEMBLING AND SERVICING
⑤ Install the head cover gasket aligning the projection
of the head cover gasket with the projection of the
cylinder head.
⑥ Valve spring retainer
Push down on the valve spring and move the retainer to the
side so that valve stem slips through the side hole.
Do not remove the valve spring retainers while the cylinder
head is attached to the cylinder, or the valves will drop into
the cylinder.
2）Inspect / service / repair：
① Valve stem outside diameter
Inspect the valve stem outside diameter with the micrometer,
if finding out of the standard or service limit, or if visually
inspecting the burn and damaged on the valve face, please
replace with new one.
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