I was racing and the bike ran fine in practice. Then i get to the gate go to fire it up and it wont start. We finally push start it and it starts. The first lap i went into a turn and it just bogged down so i shifted down to first gear and it went got into the high rpm's again. It kept boggin the whole race tho. Then wen i got off the track i let off the throttle and it just died. Also it was backfiring a lot during the race. I got and discovered the fuel mixture was gone. Do you think that ewas the only problem or do you think the valves may need adjustment now too?