CHAPTER 3A ENGINE 260/ 300 / 400 cc ATV SERVICE MANUAL09.0
CHAPTER 3 ENGINE PAGE. 3A- 37
PISTON AND PISTON PIN INSPECTION
1. Measure:
zPiston skirt diameter
Out of specification → Replace .
○
a
5.0mm from the piston bottom edge.
Valve skirt diameter:
260; 69.965-69.980 mm
300; 72.465-72.480 mm
Oversize (2)
260; 69.5 mm，300; 72.0 mm
Oversize (4)
260;70.0 mm，260;72.5 mm
2. Calculate:
zPiston-to-cylinder clearance
Piston-to-cylinder clearance=
Cylinder bore-Piston skirt diameter
Refer to “CYLINDER” section for cylinder bore
measurement.
Out of specification → Replace the piston and
piston rings as a set.
Piston-to-cylinder clearance:
0.02-0.04mm
3. Measure:
zPiston pin bore diameter
Out of specification → Replace.
Piston pin bore diameter:
17.004-17.015mm
<Limit:17.045mm>
4. Measure:
zPiston pin outside diameter
Out of specification → Replace.
Piston pin bore diameter:
16.991-17.000mm
<Limit:16.975mm>
5. Inspect:
zPiston pin
Blue discoloration/groove → Clean or replace.
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