Operator had the boat anchored at the time of fire.  He tried to start the engine and said it backfired.  He tried to start again and he heard the cowl "pop".  Operator then looked back and noticed smoke.  When he removed the cowl the flames flared up and caught the motor and back seat on fire.  Operator had two fire extinguishers on board and had to use them both in order to put out the fire.
MCMINNVILLE                   