i have been riding for years broke some bones but it still don't stop me. the only thing that does is when i blow my top end and rebuild it but for some odd reason the bike don't want to run. i have done many rebuilds and have never run into this problem. my mechanic/ pal / riding partner and i found the jug to be broken so i got a new one of those and got it back together and it runs. sweet. i can't wait to race this weekend. now i have been in a coulpe races. i love the rush.