GAS GAS FSE 400 Workshop Manual page 68

Valve rod wear
Measure the wear exterior diameter with a
micrometer.
If the exterior diameter is not found within the
specified value, replace the valve with a new one.
If the rod exterior diameter is found within the
specified value but not the deflection, replace the
valve guide with a new one.
After replacing the valve or the guide, check the
deflection.
Tool ref.:
Micrometer (0-25 mm)
DATA
Valve rod exterior diameter:
Intake: 4.975-4.990 mm (0.1959 - 0.1965 in)
Exhaust: 4.955-4.970 mm (0.1951 - 0.1957 in)
Valve guide maintenance
Extract the valve guide towards the cam axle side
with the valve guide extractor.
Tool ref.:
Extractor/valve guide mounter
NOTE:
Discard the valve guide. Oversized valve
guides are only available as spares.
Rectify the valve guide holes in the cylinder head
with the valve guide tool and the handle.
Tool ref.:
Valve guide tool (10.8 mm)
Tool ref.:
Tool handle
66
Inspection and maintenance
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