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Old 11-16-2017, 08:00 AM
Pripyat Pripyat is offline
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Join Date: Aug 2017
Posts: 143
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I was thinking of sourcing a larger cylinder head and throwing it on the stock engine while I mull over whether I really want to bore and stroke. But, if the larger headspace causes poorer performance with the stock cylinder/crank then obviously that wouldn't make sense. Hopefully someone will chime in and clear that up.

Anyway, I started pulling the trash engine apart. I am really confused by these studs. One only has 2 threads engagement, max. The other has excess? What happened here?

It looks like the guy stored this cylinder head cover under a tree.


One side of cylinder looks OK, other side has soot all over it. Definitely doesn't look honed unless the guy has no idea how to cross-hatch.




Piston scrubbing


Interestingly the piston is textbook for "damage from debris getting through air filter". This site that explains diagnosing type of piston failure is for 2-stroked but still an interesting read - http://www.madsens1.com/saw_piston_fail.htm

Last edited by Pripyat; 11-16-2017 at 08:06 AM.
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