what kind of compression should i be getting from a 72 arctic cat lynx 292
engine that  has been sitting in a field for 10 yrs and i just unsiezed. well i guess ill just answer that. its reading 90psi. i guess my ? is, in your experience, with motors like these that your able to unsieze and get running, is there usually a gain in compression after you get it running and get the seat broke back in? i would think rings are stuck now? what all have others found in these cases? thanks thumpers

What do you mean when you say "unseized"?  New top-end, rings/pistons/cylinder(s)?

90 doesn't sound bad...

90# is low. You should probably have 120 #'s or better per cylinder. You may have a ring that is stuck in the piston ring groove. I would pull the heads and cylinders and check them. It is not that difficult. Once you have it that far, you should check the amount of ring end gap in the cylinder.

SnowMule said:

no, just mean freed it up from sitting for so many years. ill pop the top for a better look though

Was it put away/fogged before it went into storage?  My guess is it's going to need some work before it runs 100% again.

I'd pull the top end off, and maybe even split the case. Then hone the cylinders and clean up the pistons/rings, replace bearings if there is rust present.
Most likely there is some rust but you may be able to bring it around by taking a syringe filled with 2 stroke oil and squirting it directly into each of the bearings and getting them worked good and free. That combined with a quick hone job with a ball hone or similar just to give the rings a decent surface  to work into should make it runable again.