CHAPTER 3B ENGINE 50cc/80cc ATV SERVICE MANUAL09.0
CHAPTER 3B ENGINE PAGE 3B - 21 -
Checking the cylinder
Check whether it’s scratched, worn or damaged in
it’s inner surface.
Measure its ID in three positions(upper, middle and
lower) which is 90°(x-y direction) from the piston pin
hole.
Replace if it goes beyond 39.1mm (50cc)
Replace if it goes beyond 47.1mm (80cc)
Between the piston and the cylinder.
Max. service allowance:
Repair or replace when it goes beyond 0.1mm
The difference between X and Y directions is
out-of-roundness
The cylindricity is the ID difference (between X and
Y directions), measuring at three positions (upper,
middle and lower).The largest measured value will
be considered the result. This indicate taper of the
cylinder.
Max. service allowance:
Out-of-roundness:
Repair or replace when it goes beyond 0.05mm.
Cylindricity:
Repair or replace when it goes beyond 0.05mm.
Check the distortion of the cylinder
Max service allowance:
Repair or replace when it goes beyond 0.05mm
Measure the ID of the small end of the connecting
rod
Max service allowance:
Replace when is goes beyond 13.06mm
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