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I have never rebuilt a snowmobile engine, I was getting compression of 125 on one side, and 90 on the other. I pulled off the heads and inspected the cylanders and rings. You can see in the photo, the gap in the ring is bigger that the other. Is this enough to mess up the compression that much? Do I need to pull the jugs out, and resleave it? The sides look perfect. I had someone else rebuild the top end and have put only 100 miles on the sled since. What could the cause of this be?
 

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you need the engine specs for your sleds engine and ensure that the ring end gap and piston to sleeve clearance is within spec
If not you need to get the next size piston, bore the cylinder and that will fix your issue
 
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