I purchased a 1986 XR600R on Ebay in January 2004. It is stock, and needs more work than I had anticipated to bring it up to the performance level I'm looking for! I've been paying to store this bike since I bought it, and haven't even begun to get it up to par! At this point I really want to get moving on it! I've pretty much convinced myself that in order to be satisfied, I'm going to have to tear this bike down to the bare frame and put it back together, examining and replacing any necessary parts. I'm thinking about doing the same thing with the engine. As I said, to my knowledge this bike is currently stock! If I'm going to tear the engine down, I might as well put it back together with at least some high performance additions. I've thought about an overbore, wiesco piston, hot cam, ect. But, in the back of my mind, I have to be realistic, and limit my spending on a 1986! Would someone explain all of the aspects of "un-corking", including any re-jetting of the carbs! I've purcased a SuperTrapp for it, and a K & N air filter. This is not the first bike I've engaged in such an adventure, although it is the first XR600R! Any, AND I MEAN ANY, input will be much appreciated!