RedactedNarrative: On 08/12/2017 at approximately 1205 hrs vessel one was with three passengers aboard. He was travelling northeast near  the north mouth of the island  channel at a wakeless speed. As he was idling toward the no wake buoy line the motor began to run rough. He applied the accelerator to try to "clean out" the overloaded carburator. On the third attempt the motor backfired, causing a flash fire/explosion. The three passengers exited the vessel with personal flotation devices as subject extinguished the fire with two on board extinguishers. One passenger was transported for burns to extremities. Victim was treated onscene.