Gasoline Engine Engine Series XR Professional Series Gross Torque 5.5 lb-ft Horsepower 4.2 hp Shaft Orientation Horizontal Shaft Configuration 5/8 in Threaded Shaft Diameter 5/8 in Shaft Length 2 7/16 in Start Type Recoil Maximum Speed 4 000 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 Overall H Facing PTO 12 5/8 in