The more you ride the more torque you will want. The design weight of the WR250 is 156lbs. You are too big for it! Your dealer is right... You can tone down the 450 if you want to. Just leave in the stock exhaust. But I bet it won't be long before you will have it out and luving that 450... Hey Alabama, where did you get that "design weight" info? My weight is right at about 156 and I had to respring my WR250F lighter (per Race Tech recommendations). Have you ridden a 250F or even a 426 or 450F (broke yours in yet?)? I could have bad info, But I've heard that even a 426 doesn't have the grunt (torque) of that XR650 you are getting rid of. Don't get me wrong, I think you made a good move going to the smaller displacement 450F. But, I'm thinking it was not for displacement or torque improvement.