10 hrs? it progressively gets worse. dorry to say. i like the way my 03 450r handled and ran...great bike. but when it's said and done, the valves and springs are $500 plus and the yamaha really is (on paper) the most progressive trackbike out with titanium everything and 2 cams (that will be different). both are good bikes. after i put 30 hrs on my yz450f, i'll post again.