well had a bad hair day. had the bike out (04/yz450) and stalled it after commin down a hill. went to kick it over and it kicked back hard. never done that before so was surprised. well it blew out the right case, backside of the kickstart shaft assembly. looking through i can see the gear looks split and missing a tooth. looks like a nasty repair bill. find out after i get it apart what all needs to be replaced. after doin a search seems like the kickstart shaft/gear is most likely the cause. also this bike is an early 04. most of the posts i found were old just wondering if anyone can add any further insight. still love my bike just really bummed.