I was looking over XR's Only yesterday and noticed that they offer a 12:1 compression piston. I think the HRC kit only comes with a 11:1. So anyway here is my question. In the near future i would like to rebiuld my 650R with a 11:1 or 12:1 compression piston, from XR's only you can get the full piston, rings, and everything you need to rebiuld for $210...but the cam cost $800:crazy: I mean thats all thats in the HRC kit right? piston and cam? Will the bike run right with a 11:1 or 12:1 piston and the stock cam?