Hey guys. I'm the wife of a pit bike racer. We cheaped out when we bought his bike and went with a piece of junk off ebay. We didn't plan on him racing it when we bought it. Well, needless to say, we have put many mods on the bike, changed the motor, big bore kit, exhaust, body, etc. He is now having problems with the bike throwing the chain. He thinks it may be the swing arm flexing due to the more powerful motor. We just purchased a new chain and it was fine for a few rides but then threw it off again and broke the side cover. Any suggestions? We are thinking of buying a new swing arm and shock. Another problem is he currently has disk brakes and they are mounted with a bracket to his swing arm. Is there a special swing arm we need to look for? Has anyone ran into this problem or have any ideas? Help is greatly appreciated as he just doesn't have the time to take care of this - it's pretty much left up to me to do the research.