I'm currently riding an 02 426, which I've added a 12 oz. flywheel and two teeth on the rear sproket to as I ride mostly fast trails. My bike is a blast to ride, in particular I love the motor--big power and very tractable--but even with the lower gearing there are times I wish I had a lower first gear and even though I've got the starting drill down, e-start would be really cool. I'm pretty interested in the 05 WR450 but I'm curious if anybody out there has made the switch from a YZ 426. How do they compare? Do you notice the weight difference? How different is the gearing? Any input would be helpful. Thanks in advance.