I have a 1994 Polaris XLT. Just rebuilt the top end and crank. stock bore but new pistons and rings. Warmed the sled up held the throttle wide open and pulled till the PSI stopped going up. I had 160 accrossed all.
A thicker or thinner gasket will definately effect your compression. If it said XLT 580 on it then it's probably right.
Is your oil pump stuck wide open. Lot's of Xtra oil in the cylinder will make the rings seal really well and bump your compression numbers up really high. You see this sometimes if you compression test a motot on the bench right after reassembly...from the assembly lube.
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