Briggs & Stratton 158cc 550 Series™ Vertical Engine produces 5.5 ft.-lbs. Gross Torque. The engines Prime N Pull easy starting system delivers the right amount of fuel to the carburetor for consistent one-pull starts. U.S.A. Not for sale in California. Customers are responsible for checking local codes and regulations prior to purchase. Not for use with riding lawn mowers Displacement (cc): 148, Shaft Dimensions Diameter x L (in.): 7/8 x 2 7/16, Application: Walk behind lawn mowers, Torque (ft./lbs.): 5.5, Shaft Output: Vertical, Engine Type: 550 Series, Start Type: Recoil, Bolt Circle (in.): 8, Shaft End Tapped (in.): 3/5-24, Max. RPM: 3,200, Ignition System: Magnetron electronic, Air Cleaner Type: Oiled foram element, Lubrication System: Lube power, Shaft Rotation (From PTO Shaft Side): CCW, Bore x Stroke (in.): 2.56 x 1.75, Cylinder Bore: Aluminum alloy, Dimensions L x W x H (in.): 13.5 x 11.5 x 10 Briggs 158cc 550 Series™ vertical engine Displacement: 158cc (9.02 cu. in.) Muffler and exhaust manifold included Elliptical piston reduces vibration for a quieter, smoother running engine; increases power and lowers emissions Large rewind starter reduces pulling effort for easy starting Lube Power lubrication system uses a gear-driven system to continuously supply oil to all internal engine parts for extra protection and long life