Ok, I have a good running 03 cr250 but I also have an extra cylinder and head from an 02 in good usable shape. I would like to do some work to the spare cylinder but would I have to replate it? Also Im in San Diego, anyone have any recommendations on engine builders near my area or even the southwest? I've heard some names mentioned before but cant remember them. Btw, Im aware of Eric Gorr, may use him but would like someone closer.