Well, I just successfully completed the YZ450 cam mod. I'm gonna try to take it out tomorrow if I'm able to complete all the items on my "Honey Do..." list. The most difficult part was getting the damn decomp bushing out of the head. I chewed it up real good just trying to pry it out. I had to remove the radiator to get the damn thing out. A test ride up and down the street felt real good. The midrange "hit" seemed to be gone. It seemed much more linear as others have reported. It kicks over real easy. I'll let you know how it goes.