Ok so I did it. I converted back to a 2003 YZ250, from my CRF. God how different these two beasts are. I rode the YZ in the desert (The usual break in time I do out there) and what a "HIT" the thing has, were the CRF is smooth. Nothing personal against the CRF, infact I really liked it however I felt I could turn a 2:10 lap time instead of a 2:12 on my CRF. I will go back to a four stroke, however as of right now I "feel" I can go faster on a 250, than I can a 450 (again it's rider preference so don't rip me apart), the cornering on any 250 from a 450 feels like your RC in the corner combined with a surge of power. I will be getting a four stroke within 3 years or so, but as of right now I'm happy with my bike (although I will never switch a bike in the middle of a race season again...talk about work, and missing races trying to get it prepped right). I will post more differences sunday afternoon after i go to speedworld here in AZ.