I'm rebuilding my 450+ hr motor on my 07 WR450. I pose the quetion here hoping Grayracer will reply.... First thought's was I was going to be replacing the crank with this many hours but everything is in the tight end of spec and looks great. Only wear I'm seeing is the cam chain sprocket teeth have 3 visible marks on each tooth were the chain rides. With a dental pick it still feels smooth though, no ridges and otherwise the teeth look fine. Thoughts? Replace, or good for one more year?