Honda SH300 2006 Manual page 246

CYLINDER/PISTON
Check the cylinder for warpage with a straight edge
and feeler gauge in the directions shown.
SERVICE LIMIT: 0.05 mm (0.002 in)
PISTON/PISTON RING
Inspect the piston rings for movement by rotating
the rings. The rings should be able to move in their
grooves without catching.
Push the ring until the outer surface of the piston
ring is nearly flush with the piston and measure the
ring-to-groove clearance.
SERVICE LIMITS: Top:
Insert each piston ring into the bottom of the cylin-
der squarely using the piston.
Measure the ring end gap.
SERVICE LIMITS:
Top:
Second:
Oil (side rail):
Measure the piston pin hole I.D. Take the maximum
reading to determine I.D.
SERVICE LIMIT: 17.03 mm (0.670 in)
Measure the piston pin O.D. at piston and connect-
ing rod sliding areas.
SERVICE LIMIT: 16.98 mm (0.669 in)
Calculate the piston-to-piston pin clearance.
SERVICE LIMIT: 0.02 mm (0.001 in)
10-6
0.080 mm (0.0031 in)
Second: 0.065 mm (0.0026 in)
0.50 mm (0.019 in)
0.65 mm (0.026 in)
1.00 mm (0.039 in)
PISTON RING