Honda 2003 NPS50 Ruckus Service Manual page 193

Measure the piston O.D. at the point 1 0 mm (0.39 in)
from the bottom of skirt 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. i n the X and Y axes at
three levels.
Take the maximum reading to determine the cylin­
der wear.
SERVICE LIMIT: 37.840 mm (1.4898 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 LIMITS:
Taper: 0.05 mm (0.002 in)
Out-of-round: 0.05 mm (0.002 in)
Check the cylinder for warpage with a straight edge
and feeler gauge in the directions shown.
SERVICE LIMIT: 0.05 mm (0.002 in)
CRANKSHAFT /PISTON/CYLINDER
MIDDLE
BOTTOM
1 3-9