I have a '04 model YFZ450. I've noticed that it seems to be much lower geared than my bros '05 Honda 450R, and my buddies '06 450R. With it pinned I don't think I could get near the 70+ topend I've read.

Did yamaha change the gearing in the trans after '04? Is it possible that the guy I bought it from did something?

I'm running 20" Razr's with 14 38 sprockets.