Honda GX120K1 Manual page 105

GX120K1•GX160K1•GX200
VALVE STEM O.D.
Inspect each valve for face irregularities, bending, or abnormal
stem wear. Replace the valve if necessary. Measure and record
each valve stem O.D.
Standard
IN 5.48 mm (0.216 in)
EX 5.44 mm (0.214 in)
Replace the valves if their O.D. is smaller than the service limit.
VALVE GUIDE I.D.
Note:
Ream the valve guides to remove any carbon deposits before
measuring.
Measure and record each valve guide I.D.
Standard
5.50 mm (0.217 in)
Replace the guides if they are over the service limit
GUIDE-TO-STEM CLEARANCE
Subtract each valve stem O.D. from the corresponding guide I.D.
to obtain the stem-to-guide clearance.
Standard
0.02-0.044 mm
IN
(0.0008-0.0017 in)
0.06-0.087 mm
EX
(0.0024-0.0034 in)
If the stem-to-guide clearance exceeds the service limit,
determine if the new guide with standard dimensions would bring
the clearance within tolerance.If so, replace any guide as
necessary and ream to fit. If the stem-to-guide clearance exceeds
the service limit with new guides, replace the valves as well.
Note:
Recondition the valve seats whenever the valve guides are
replaced (P. 9-7).
gx120k1_gx160k1_gx200
Service limit
5.318 mm (0.2094 in)
6.275 mm (0.2077 in)
Service limit
5.572 mm (0.2194 in)
(P. 9-6).
Service limit
0.10 mm
(0.004 in)
0.12 mm
(0.005 in)
CYLINDER HEAD/VALVES
9-5