I have a 2001 220 that I ride on very tight trails, (trials type stuff) and long steap hills and have a problem with my bike boiling the raditor fluid. The over flow bottle fills up and dumps the extra out. I had a 1990 200 and very seldem had it boil on the same type of ride. I think part of the problem may be the over flow bottle is right behind the raditor and it does not get enough air flow, it also seams smaller then the rear mount tank. Has anyone else had this same problem and do you have any sugestions? I thought I may try adding a rear over flow bottle like the old models and remove the original one??? It looks like their is a mounting tab still on the rear sub frame. Has anyone tride this?? The bike runs great and is stock except geard down.