The 426 is great, and actually are preferable over the 450s by a lot of people, including me. The yz426 is preferable over the yz450. If you can get it on a trade go for it I don't think you could be any happier with it. They are geared slightly higher with a still high compression and they hit the power band quick. When we had our 426 it was an entirely different monster. What all has been done to it?