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The compression is too valuable anything you do to change it will effectively lower the compression at TDC it's better to widen the exhaust port to compensate...
 

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Yes just enlongate it a bit don't raise it up just be known that the biggest hindrance in these engines is the flow path between the intake Reed cage and the feed ramps
 

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I run them until they start losing power or they get so clickyclacky it sounds like its going to blow it's always the same problem piston rings and cylinder wasted, wrist pin bearing, clutch side crank bearing.

These engines are so inexpensive sometimes it's not even worth rebuilding and you're better off getting a new one and starting with a blank canvas 60$
 

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New is nice having around. I have so many new cylinders and pistons, gasket, carbs, I am in a position to rebuild but not a lot are.
Yea but you run 40:1 I'm running 50:1 sometimes 60:1 on dominator at 40:1 you probably get about 3 cylinders per 1 bottom end am I correct on my estimates ?
 
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