I'm not totally, certain, but I the 01 CR cylinder should mount to your cases and use the same bore diamater as your 97 cylinder. There may be differences in the PV mechanism but probably not. I know some folks swap the 99 cylinder onto their 01's to get a smoother power delivery for woods riding, (and vice versa for mx and dez). The 01 cylinder should yeild a little performance improvement as well with its updated porting specifications. 02 and up cylinders would most certainly not fit, as they are a case reed engine. If it were my bike I'd try the 01 cylinder if the price were right:)