Ok, bigger problems now. I went out to a local track Sunday and while riding my quad made a horible noise and died. I took it back to a freinds house tore it down and the exhaust valves broke off and fell into the cylindar tearing up my piston and head. Now what would cause that and how do I fix it so it does not happen again. Do you think this had something to do with the carb not being tuned in perfect. I mean it was close or so I thought so.