Has anyone out there ever replaced a gear on there 426. If so whats entailed and how hard is it? While coming off a jump, my third decided to fail. A mechanic rode and said its gone. He said i would have pull out the motor(which i have), pull off the head and split the case. It was to my benifit to do it myself as this would have cost $600.00 in labor. I'm actually considering getting rid of the bike and getting a slightly used one as the cost-to-benifit ratio puts me in a bind. Any advice would be appreciated.