Briggs and Stratton 31A607-3026-G5 500cc 15.5 Gross HP I/C Engine with a 1-Inch Diameter by 3-5/32-Inch Length Crankshaft Dura-Bore cast iron cylinder sleeve for extended life Float carburetor for consistent easy starting Maintenance-free Magnetron electronic ignition for quick, dependable starts Anti-vibration System provides less vibration and a smoother ride 12 Volt electric start