I was checking compression on a jet ski I took possession of and didn’t believe the readings I was getting on my cheap Chinese compression checker. So I put it on my 50 Yamaha because I just new it had good compression as it starts and runs great, low and behold it reads 60psi on all 3 cylinders. So now I just know the cheap ass gage is the problem, and get a certified gage out of my work truck and get 62 psi on all three cylinders again. Plugs out, throttle wide open, but it was a cold engine. Am I screwed or about to be with this motor? Like I said it runs great. It’s a two stroke.
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