G120F/G160F/G200F Part IV Disassembly and maintenance
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3. Inspection/maintenance/reconditioning:
1) Valve stem O.D
Measure valve stem O.D With a millimeter if it’s
smaller than the standard value or the service limit,
or valve face has visible ablation or cracks, replace
the valve.
Standard Service limit
IN 5.48 mm 5.318 mm
EX 5.44 mm 5.275 mm
2) Valve spring free length
Measure the free length of valve spring.
Replace the springs if they are short than standard
length or beyond service limit.
3) Cylinder head
Remove carbon deposits from the combustion chamber,
clean off any gasket material from the cylinder head
surface.
Check the spark plug hole, valve areas and valve guides
for cracks.
Check the cylinder head for warpage with a straight edge
and a feeler gauge
4) Valve guide
Inspection:
Standard Service limit
30.5mm 29.5mm
Service limit Replace if above 0.10 mm
Straight edge
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