OK i know this has gone over many times but i really would like some help on this. I am currently the Owner of an 06 Yz450 that the dealer is going to buy back from me, because they sold it to me recently with a cracked case that i later found was JB welded. Now that im getting my money back, i have to decide if i want a WR, or a YZ again. I have a few questions that i hope you guys will be able to answer. First of all, I only ride trails and single track. I really want to know how the Wr Power is compaired to the Yz? After doing the Free mods, will the power be very simular? or would i notice a pretty big difference? Is the weight on the Wr situated much like the YZ? I really liked how light the front end felt on the YZ. Or does it feel front end heavy? Weight? can you even tell the extra pounds if your mostly a trail rider? 07wr450 VS 06wr450? is there much of a difference with the aluminum frame and the steel frame? Which bike would be more prefered? and is the motor much different between these years? Rear Wheel, dumb question? but why are the wheel sizes different from the Wr and the YZ and would it be stupid to put a Yz wheel on the Wr? and will it fit? I weigh 195lb and would the stock supension be adequate on the Wr or will the need to be changed? I know many of these questions come down to prefrence but i am just looking for answers and opinions will apreciate all your help!!