CF MOTO CF500-5B 2009, Service Manual, Page: 125 / 272

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C F MOTO
Piston Ring Free End Gap and End Gap
Before installing piston rings, use vernier caliper to
measure the free end gap of each ring, and then fit
ring into the cylinder.
Use thickness gauge to measure each ring end gap,
if any ring has an excess end gap, replace the
piston ring
Piston ring free end gap limit:
Top ring ! !
8 . 9mm
2
nd
ring ! !
9 . 5mm
Piston ring end gap limit:
Top Ring ! !
0 . 60mm
2
nd
ring ! !
0 . 60mm
Tool: Vernier caliper
Thickness gauge
Piston Pin and Pin Bore
# Use a bore gauge to measure the inner diameter
of piston pin bore.Use micrometer to measure outer
diameter of piston pin.If out of limit, replace both
piston and piston pin.
Piston pin bore limit: 23.030mm
# Use micrometer to measure piston pin outer
diameter at three points
Piston pin outer diameter limit: 22.980mm
Tools: Bore gauge (18-35mm)
Micrometer (0-25mm)