In my humble opinion, a 220 doesn't have any business on a track unless it's modified. I have a 220, but I ride real tight technical rocky nasty type stuff. To make it rev, you need to put a rev pipe on it first off, and then you'll need to think about opening up the carb. Since you said you want to stay stock, and you made a track, I think you'd be better off with the 200. At least it comes with a bigger carb. The 220 has an O-ring chain, 20 extra cc's, 3 month shorter warranty, and a smaller carb for the extra $400. Maybe you oughta buy the 200, and some appropriate jets and fork springs with some of the savings.
Mike.