Easiest way to tell CR on a 440?

[EMX5636]

I recently purchased a 440ex from a buddy of mine. He had all the work done a while ago and can't remember what piston got put into it. I want to figure it out so I know what to mix my gas if I can, or if I need to run full race gas. I figured the best was to do a compression test. Anyone know what the 11:1 and 12:1 should produce during the test? Post up the numbers so I can compare... Thanks,

Justin W

[drew416ex]

According to the manual, stock is supposed to be between 100-128 psi. When I had a 87mm wiseco 11:1 in mine it had around 190-200 psi. Hope this helps. The cam thats in it will also play a role in how much cylinder pressure there is depending on how much overlap the cam has.