CHAPTER 3A ENGINE 260/ 300 / 400 cc ATV SERVICE MANUAL09.0
CHAPTER 3 ENGINE PAGE. 3A- 36
PISTON AND PISTON RINGS REMOVAL
1. Remove:
zPiston pin circlip c
zPiston pin d
zPiston e
NOTE:
Before removing the piston pin circlip, cover the
crankcase opening with a clean tow el or rag to
prevent the circlip from falling into the crankcase
cavity.
2. Remove:
zTop ring
z2nd ring
zOil ring
NOTE:
When removing the piston ring, open the end
gap of the ring by fingers, and push up the other
side of the ring.
CYLINDER INSPECTION
1. Measure:
zCylinder bore
Out of specification → Rebore or replace.
NOTE:
zMeasure the cylinder bore with a cylinder bore
gauge.
zMeasure the cylinder bore in parallel to and a
right angle to the crankshaft. Then, find the
average of the measurements.
Cylinder bore:
260;70.000- 70.014mm，
300;72.500- 72.514mm
< Limit:260;70.025mm，300;72.525>
< Difference limit between A,B and
C :0.03m m >
2. Measure:
zWarpage
Out of specification → Replace.
Cylinder warpage limit:
0.03mm
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