Thanks for the info. I was looking at the KB741. I think they would have about 10.55:1 compression with the RPM 65cc chambers. What's the limit on compression for pump gas? Would you happen to know which kind of pistons would be good for my application for preferably not much more than $300? I was looking on the net but am not very knowledgable in the piston dept. Thanksmikesduster said
