One thing I really noticed is the 450's constantly spinning. Like they had too much torque. Like cleonard said if they had traction they had lots of go. It seemed that since my bike wasn't hitting as hard it kept traction were they would break loose and spin. What good is all that power if she won't hook up? I always had the idea I would get a 450 cause more power was always better and you didn't have to use it but now I wonder if I should stay on the 250 and just give it a few mods.