RedactedNarrative: On June 3, 2022 at approximatly 8:00 PM, V1 Operator and Witness were operating two different recreational boats on the Illinois River upstream from the Marseilles Lock and Dam. V1 Operator was traveling downstream, westerly, when he observed a large boat approaching in his direction. V1 Operator and Witness turned their boats around and proceeded away from the large boat in an easterly direction. V1 Operator said he increased the throttle quickly and heard a pop. He looked behind him and observed smoke coming from the engine area. Witness was operating a different boat in front of V1 Operator. He looked back and saw smoke coming from the boat V1 Operator was operating, so he turned around to get him. V1 Operator grabbed his phone and wallet and jumped out of the boat into the Illinois River, without turning off the engine. He boarded the boat Witness was operating. The boat caught on fire. Marseilles Fire Department extinguished the boat fire. The boat was towed back to the boat ramp and removed from the water. The exact cause of the fire is unknown.The boat was a complete loss.