Raider Mini 90 (single/double-seat): Service Manual Version：2.0 Feb. 2006
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b) Remove the cylinder head;
Remove the cylinder carefully to see the whole
piston;
Remove one piston pin clip, and remove the piston
and piston pin;
Spread and remove each piston ring.
NOTE: Don’t let the clip drop into the engine
crankcase.
3.1.3 Cylinder and Piston Inspection
a) Inspect the cylinder bore for wear or damage;
Measure the cylinder inner diameter at three levels
in X and Y-Axis;
Taper limit: 0.05 mm
Out of round limit: 0.05 mm
b) Check the cylinder head mating surface for warp
with a straight edge and feeler gauge;
Service limit: 0.05 mm
c) Insert each piston ring into the cylinder;
Measure the end gap;
Service limit: 0.45 mm
Locating pin
Bush
Cylinder Body
Cylinder Head Mating Surface
End Gap
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