Honda Metropolitan CHF50 Service Manual page 209

CRANKSHAFT/PISTON/CYLINDER
Measure the piston O.D. at the point 10 mm (0.39 in)
from the bottom and 90° to the piston pin hole.
SERVICE LIMIT: 37.72 mm (1.485 in)
Calculate the cylinder-to-piston clearance (cylinder
I.D.: see below).
SERVICE LIMIT: 0.08 mm (0.003 in)
Inspect the cylinder bore for wear or damage.
Measure the cylinder I.D. in the X and Y axes at
three levels.
Take the maximum reading to determine the cylin-
der wear.
SERVICE LIMIT: 37.76 mm (1.487 in)
Calculate the taper and out-of-round at three levels
in the X and Y axes. Take the maximum reading to
determine both measurements.
SERVICE LIMIT:
Taper:
Out of round:
0.05 mm (0.002 in)
0.05 mm (0.002 in)
TOP
MIDDLE
BOTTOM
Check the cylinder for warpage with a straight edge
and feeler gauge in the directions shown.
SERVICE LIMIT: 0.05 mm (0.002 in)
12-9