how much compression??

[400ex18]

i have an 86 250r and its bored 60 over, but how much compression should it be puttin out?? i know its low it runs like 120!

[zedicus00]

160 at least.. a lot of people run thinner gaskets and milled heads, anywhere up to about 240 on race gas. pump gas is safe to around 180 or a bit more depending.