I was just wondering what year the Yamaha went to an aluminum frame and if it would make that big of a difference. I am 5ft. 10in. and weight 185 and work out all the time but the 426 just seems to be to much of a terd in terms of weight on the track. I love the bike in the woods but if anybody went from one of these to the new Yamaha could you please tell me if it's really worth spending the money?!?!?!?!?!?!!?