Honda GX120K1 Manual page 104

CYLINDER HEAD/VALVES
INSPECTION
VALVE SPRING FREE LENGTH
Measure the free length of the valve springs.
Standard
30.5 mm (1.20 In)
Replace the springs if they are shorter than the service limit.
VALVE SEAT WIDTH
Measure the valve seat width.
Standard
0.8 mm (0.03 in)
If the valve seat width is under the standard, or over the service
limit, recondition the valve seat
CYLINDER HEAD
Remove carbon deposits from the combustion chamber. Clear off
any gasket material from the cylinder head surface.
Check the spark plug hole and valve areas for cracks. Check the
cylinder head for warpage with a straight edge and a feeler gauge.
Service limit
9-4
gx120k1_gx160k1_gx200
Service limit
29.5 mm (1.161n)
Service limit
2.0 mm (0.08 in)
(P. 9-7).
0.10 mm (0.004 in)
GX120K1•GX160K1•GX200