im going to go look at a 2011 yz450f today. The bike looks sharp in the pics and is just down the road. What do I look for to make sure it was well taken care of? The guy said about 60 hours is on it and it looks pretty clean, and he did oil and air filter after every ride. Lastly, if I want to sell a 450f will I have a harder time selling it than a 250 2t? I'm stuck between a kx250 and this yz450f. I'm pretty cheap so I don't know how that plays into the equation. What's the average rebuild cost of a 450f?