The boat had just been purchased and the owner and a friend were taking it for a test run when the engine backfired and the boat burst into flames.
This is in the northeast corner of the lake near the public boat ramp and Johnson park.
Fire, police and game warden were there not long after the call came in around 4:30 p.m.
Boats nearby moved in to rescue the two men on board, who had jumped into the lake.
Neither was hurt, but the boat eventually sunk.