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Measure the roundness of inner wall （ bore diameter
difference between X and Y direction ）.
Allowable limit：0.05mm.
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.
Measure the bore diameter of connecting rod small end.
Allowable limit：14.06mm.
13.4.2 Installation of piston
Install the guide pin.
Paint the engine oil on each piston ring and piston. Install the
piston in the right place with the mark of piston ring upward.
*Attention:
The piston should not be scratched and the piston ring should
not be broken.
After installed, the piston ring can rotate freely in the slot of the piston ring.
Scrape the adhesive gasket off the crankcase.
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