Check engine

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I disassembled OS engine.

And Checked primary components.

I found two hit points on pistons.

There are same position on both side.


This position is piston pin guide on backside.
It is different position of thickness.
Then the position is more expand than others.
Should be more warm sleeve by heat gun on first fire.


Crankshaft has no scratch.


Bearing has rust.

If it remained fuel it calls rust.

I have to replace one.


I order ceramic bearing and carburetor cover.






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