The DuroMax XP18HP is our largest and most powerful single cylinder engine we offer; this 440cc 4-stroke OHV Powerhouse is suitable for multiple heavy-duty applications including go karts, pressure washers, trailer mounted-mobile carwashes, log splitters, roto tillers-cultivators, and water/trash transfer pumps. This engine is equipped with convenient features like a large 1.7-gallon fuel tank for longer runtimes, E-Z Pull Recoil Starter for starting the engine with ease, and EPA and CARB approved for safe mandated use.