Piston/Cylinder Inspection - Honda 2003 NPS50 Ruckus Service Manual

CRANKSHAFT /PISTON/CYLINDER

PISTON/CYLINDER INSPECTION

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:
Second:
Insert each piston ring into the bottom of the cylin­
der squarely using the piston.
Measure the ring end gap.
SERVICE LIMITS:
T op/Second:
Oil (side rail): 0.80 mm (0.031 in)
Measure the piston pin bore I. D. Take the maximum
reading to determine I. D.
SERVICE LIMIT: 10.04 mm (0.395 in)
Measure the piston pin O.D. at piston and connect­
ing rod sliding areas.
SERVICE LIMIT: 9.98 mm (0.393 in)
Calculate the piston-to-piston pin clearance.
SERVICE LIMIT: 0.04 mm (0.002 in)
Measure the connecting rod small end I. D.
SERVICE LIMIT: 10.05 mm (0.396 in)
Calculate the connecting rod-to-piston pin clear­
ance.
SERVICE LIMIT: 0.06 mm (0.002 in)
1 3-8
0.08 mm (0.003 in)
0.08 mm (0.003 in)
0.40 mm (0.016 in)