I agree with above, could be a bad/blown/leaking head gasket, loose head bolt(s), loose spark plug, etc. If the cart does not blow a lot of smoke when running, the rings are probably good. Valves could be a problem, if out of adjustment. You state low compression, did you do a compression test? If not I have the equipment for doing that.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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