I really like my gearing on my 2006 YZ450F. The only problem I have with it is I want better top speed; however, I don't want to just swap sprokets. I literally ride tight woods one weekend to high speed desert the next. I am in 5th quite a bit in the desert, and I hate reving the piss out of it to cruise at a decent speed. The wide ratio tranny is cool, but I like the close ratio gears. Is it possible to swap out 5th gear for a WR 5th? Or do you have to swap out all 5 gears and completely change it from close ratio 5 to a wide ratio 5?