honestly i highly doubt there will be any problems with the yfz450 cuz they've been working on it for 3 years...

 

omfg predfan u lucky sob, u got nice some toys!

 

Hey, you said the the pred has more power to power, I am assuming you mean hrsp. Well, barely. Also, if you factor in the weight difference, the yfz has more power in a big way.
I gotta tell ya, from the pred's I have seen, those things have no bottem end what so ever. It's true, they are fast, but they take a while to get there. A raptor, from experience, will even beat a predator all the way to the top, and even then, when the pred is actually doing what it is "good at" , its still just equal with the raptor. So as far as having a more performance oriented machine, the yfz is going to be better in almost every aspect.
Your pred is prob a good handling machine, when compared to the raptors. NOT when compared to the yfz though!

 

If the Predator's engine is so much stronger... why arent they in a big hurry to get Predator engines into custom-framed pro-class machines...

And as far as being proven... how much more proof does the 450 engine from Yamaha need? People have been putting them into quad frames for years, and the YZ450F is an incredible bike. Why get a company's first attempt at a TRUE sport quad, when you can have YEARS of racing experience from Yamaha. We'll see in months to come just how well the YFZ performs... but personally, i think Yamaha learned valuble lessons from the 2001 raptors... we will see... we will see...

 

It may actually have the same hrspwr, and with 65 less Lbs.