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How much compression

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I have an 05 yz 250 I was wondering how much pounds of compression it should have? How much squish clearence should it have. All stock

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Mine with a fresh top end is right around 235psi. I am not sure what the squish is at right now but it should be around .050-.055". Thats what I am going to get mine down to, than open the chamber back up. Does anyone know what size radius the chamber is, or what type of formula I have to use to figuire out how much to cut out of the chamber to = 1 cc?

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