RedactedNarrative: OPERATOR WAS OPERATING VESSEL ONE SOUTH ON THE WHITE RIVER.  AS HE ACCELERATED THE BOAT HE HEARD THE BOAT BACKFIRE AND THE BOAT STALLED.  THE OPERATOR LIFTED THE BACK COVER TO THE MOTOR AND FLAMES SHOT OUT.  THE OPERATOR ATTEMPTED TO EXTINGUISH THE FIRE UNSUCCSEFULLY WITH THE ON BOARD FIRE EXTINGUISHER UNTIL THE FIRE EXTINGUISHER WAS EMPTY.  THE OPERATOR AND PASSEGNERS WERE ABLE TO GET ABOARD ANOTHER NEARBY BOAT WITHOUT INJURY.