Gasoline Engine Engine Series XR Professional Series Gross Torque 5.5 lb-ft Horsepower 3.5 hp Shaft Orientation Horizontal Shaft Configuration 3/4 in Dia Keyway Tapped 5/16 in-24 Shaft Diameter 3/4 in Shaft Length 2 7/16 in Start Type Recoil Maximum Speed 3 600 RPM Muffler Yes CARB Compliant CARB Non-Compliant Engine Brand Briggs and Stratton Engine Displacement 127 cc Fuel Tank Capacity 2 qt Engine Cycle 4-Cycle Overall Depth 11 in Overall Depth Facing PTO 6 7/8 in