Gasoline Engine Engine Series Vanguard Gross Torque Not Applicable Horsepower 18 hp Shaft Orientation Horizontal Shaft Configuration 1 in Dia X 2.90/2.98 in Long 1/4 in Keyway 3/8-24 D T Shaft Diameter 1 in Shaft Length 2 15/16 in Start Type Electric Maximum Speed 3 600 RPM Muffler Yes CARB Compliant CARB Non-Compliant Engine Brand Briggs and Stratton Engine Displacement 570 cc Engine Cycle 4-Cycle