CHAPTER 3B ENGINE 50cc/80cc ATV SERVICE MANUAL09.0
CHAPTER 3B ENGINE PAGE 3B - 20 -
Install the ring and measure the clearance of the
ring groove.
Max. service allowance:
The top ring: Replace when is goes beyond
0.09mm.
The 2nd ring: Replace when it goes beyond
0.09mm
Remove the piston rings.
Install the piston into the bottom of the cylinder,
Attention:
Use the piston head to press the rings in place in
the cylinder.
Measure the piston ring end gap in bore
Max service allowance:
Replace when it goes beyond 0.45mm.
Measure the ID of the piston pin hole.
Max service allowance:
Replace when it goes beyond 13.04mm.
Measure the OD of the piston pin.
Max service allowance:
Replace when it is below 12.96mm
Measure the OD of the piston
Attention:
Measure it in a position which is 90° from the center
of the piston pin, and it is 10mm away from the skirt.
Max. service allowance:
Replace when it is below 38.9mm（50cc）
Replace when it is below 46.9mm（80cc）
Measure the clearance between the piston pin
and the pin hole
Max service allowance:
Replace when it goes beyond 0.02mm
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