RedactedNarrative: Boat A was traveling southwest in the Bay of Green Bay from Dykesville, Brown County WI.  Boat A was approximately four to five miles from shore.  Boat A's operator indicated that the motor stalled.  The operator opened the engine compartment and checked the engine.  After checking the engine, he attempted to start the engine again.  The operator stated the engine turned over but did not stay running.  A fire started in the engine compartment when the attempt to start was made.  The operator stated he attempted to use a fire extinguisher but the fire extinguisher failed.  The fire continued to spread causing the operator and his male passenger to abandon Boat A after putting on PFD's.  Boat A continued to burn until Green Bay Fire Department's fire boat arrival.  Attempts to extinguish the fire and well as the integrity of Boat A's hull due to the fire resulted in it being sunk.