When checking compression what should my numbers be?
I’m thinking you should see between 100-120PSI for compression on this engine. More importantly, the readings should be the same between cylinders. Uneven readings, or unusually low readings may indicate damage caused by running that engine on 100:1 mix, or perhaps an overheat. Be sure to peel that 100:1 sticker off the lower engine cowl by the fuel connector. There is the possibility that a blown head gasket could cause low/uneven readings also…
But, even with a damaged powerhead, $100 is still a good deal, you can always find another powerhead for about $100.
.
.