I am having problems with my bike when I shift into 5th. It kind of lurches and almost seems like that it cuts out. I can hold it wide open in 1st through 4th with no problems, it just pulls and revs out. I even tried a fresh filter just to make sure that it was not plugged. I have not ever lost a gear before that did not either seize up or make a racket when it popped in and out of gear. My next step is to tear it down but I thought I would see if anyone has ever had these same descriptions of a blown gear.