Propane fuel - owners said the heat exchanger went out and that’s why his dad quick using it. He believed it has been around 15years since it’s ran. They pulled it to the lot and the brakes did work. I was unable to roll the engine over. Condition unknown. Model 4.25x5 283A Serial# 01916895 Location: Wiggins Auction Yard, 2025 S. Logan Rd., Lahoma, OK Blade Bode, Auction Mgr., 580.554.4868