3-18 ENGINE
VALVE STEM WEAR
If the valve stem is worn down to the limit, as measured with a
micrometer, replace the valve.
If the stem is within the limit, replace the cylinder head.
After replacing the valve, be sure to recheck the deflection.
Valve stem O.D.:
Standard (IN): 3.975 – 3.990 mm (0.1565 – 0.1571 in)
(EX): 3.960 – 3.975 mm (0.1559 – 0.1565 in)
09900-20205: Micrometer (0 – 25 mm)
VALVE SEAT
• Install the valve and valve spring after cleaning.
• Pour a small quantity of gasoline into the intake or exhaust
port.
Check that no gasoline leaks through the valve seat.
If leakage is found, replace the cylinder head.
VALVE STEM END CONDITION
Inspect the valve stem end face for abnormal wear or damage.
If abnormal wear or damage is found, resurface the valve stem
end.
If the length A is less than the service limit, the valve must be
replaced.
Valve stem end length (IN & EX):
Service Limit: 3.0 mm (0.12 in)
09900-20102: Vernier calipers
Always use extreme caution when handling gasoline.
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