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Discussion Starter #21
I split the 10mm wrist pin engine and used some gasket sealant, assembled without base gasket. Around 160 psi I get now so it do have compression.
If it still runs like crap I will change the crank sealings.
I will try to start the engine later.
I'm thinking of buying a little longer sparkplug to boost the compression a bit.
NGK BPR7HS I think that will work.

The 12mm wrist pin engine have not yet been ported. So it's not assembled.
 

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Discussion Starter #22
Yeah it was an airleak.
I used gasket sealant and it idles nice and revs nicely.
It need more fuel though.
Still using stock carb with stock jet. Needle on highest setting.
Got an pumper carb from China on its way but will take a few more weeks before that arrives.
Tested the engine with my stock exhaust. Hobbit sport exhaust are really really bad.
Boat shaped expansion chamber and header is 12mm thick and the stinger looks like it's the twice the thickness.
Got to weld the other exhaust I've got
 
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