hello, heres my problem. my son was on his last lap and crossed the finish line jump. he said when he landed that he heard a BIG CRACK sound. i tried to down shift the bike and try to get it in gear, but it won't shift up or down. it is "locked" into gear. the bike does start up and it will move with the clutch in. it seems to me that it is stuck in 4th gear cause i had to get the RPMs up to get it moving. anyways... i was wondering if you guys had an idea of what this could be and what would be the cost of the repair. also i was wondering whats a good website to look up parts for this paticular bike. thanx for all the help. Aaron