Drove in downpoor yesterday for about an hour, put bike in shed overnight. Took out next morning and cleaned. Started bike, ran for about 30 seconds, sputtered, popped and died. Cleaned air filter, changed spark plugs and took blow dryer to all areas. Tried to start and same thing happened. Let sit most of the day in sun...still only starts, sputters with loud pop and when try to throttle it pops and dies. ANY HELP WOULD BE APPRECIATED!!