Briggs & Stratton 31G777-3036-G5 500cc 17.5 Gross HP Intek Engine With A 1-Inch Diameter X 3-5/32-Inch Length Crankshaft, Keyway, Tapped 7/16-20 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 CARB Compliant