Honda C8R600F4 Service Manual page 225

Measure the piston O.D. at a point 15 mm (0.6 in)
from the bottom and 90° to the piston pin hole.
SERVICE LIMIT: 66.90 mm (2.634 in)
CYLINDER INSPECTION
Inspect the cylinder wall for scratch or wear.
Measure the cylinder
l.D.
at three levels in an
X
and
Y axis. Take the maximum reading to determine
the cylinder wear.
SERVICE LIMIT:
67 .10 mm (2.642 in)
Calculate the cylinder-to-piston clearance.
SERVICE LIMIT: 0.10 mm (0.004 in)
Calculate the cylinder taper and out-of-round at
three levels in an X and Y axis. Take the maximum
reading to determine the taper and out-of-round.
SERVICE LIMITS; Taper: 0.10 mm (0.004 in)
Out-of-round: 0.10 mm (0.004 in)
The cylinder must be rebored and an oversize
piston (0.25 mm) fitted if the service limits are
exceeded.
The cylinder must be rebored so that the clearance
for an oversize piston is 0.015-0.050 mm (0.0006-
0.0020 in).
Check the top of the cylinder for warpage with a
straight edge and feeler gauge.
SERVICE LIMIT: 0.10 mm (0.004 in)
CRANKSHAFT /PISTON/CYLINDER
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TOP
MIDDLE
BOTTOM
12-13