Do not rev your motor and pop it in gear to pop wheelies. I stripped the gear dogs on my first gear. I did not know it was messed up until I got in some peanut butter mud and it kept slipping out of gear. It is a very costly deal. I did mine my self but the shop wanted 850 bones just to remove the motor and put it back. The parts cost me about 3 bucks. My bike was down for about 4 weeks by the time I got the manual and parts in the mail. Although I did find time to port the head.