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Message: [QUOTE="_JOE_, post: 1361339, member: 77507"] Compression will depend on how they set up the motor. When it's back together and broken in take a preliminary reading. Use this as your starting point. Ring gap should be like .004-.006" PER INCH OF BORE SIZE. It will tell you on the instruction sheet with the piston kit. Yes, the best thing to do is to disassemble and inspect/measure everything so you only have to make 1 parts order. Be aware the lower end will require more frequent maintenance with the modified engine. Good luck with the project! I would still call up PR2 and ask if they have any precautions or suggestions of things to look for. They should be able to provide you with a piston kit or at least a part number. [/QUOTE]