Installation Of Piston - Generic Trigger X 50ccm Owner's Manual

Measure the roundness of inner wall（bore diameter difference between X and Y direction ）.
Allowable limit：0.04mm。
Measure the cylindricity of inner wall（bore diameter difference at the upper , middle and lower part in X or Y
direction）.
Allowable limit：0.05mm。
Inspect the flatness of the cylinder surface.
Allowable limit：0.05mm。
Measure the bore diameter of connecting rod small end.
Allowable limit：15.06mm。

11.4.1 Installation of piston

guide pin.
Install the
Evenly spread machine oil on each piston ring and
piston and correctly install the piston ring by
aligning it with the guide pin on the piston.
Note：
The piston should not be scratched and the
piston ring should not be broken.
The piston ring should be assembled with its
marked side upward.
upper
middle
middle
lower
Testing gauge
bore diameter of connecting rod small end
guide
- 92 -
ruler
cylinder
piston
Top ring
second
ring