This 23 HP electric-start Briggs & Stratton vertical OHV engine is designed for use with commericial mowers and lawn tractors. Displacement (cc): 627, Shaft Dimensions Diameter x L (in.): 1 x 3 5/32, Application: Commercial mowers and lawn tractors, Shaft Output: Vertical, Engine Type: V-Twin OHV, Start Type: Electric, Mounting Base L x W (in.): 7.63 x 7.07, Shaft Keyway (in.): 1/4, Shaft End Tapped (in.): 7/16-20, Max. RPM: 3,300, Charging System Amps: 16, Ignition System: Magnetron® Electronic, Cylinders (qty.): 2, Oil Capacity (qt.): 3, Air Cleaner Type: Dual element includes automotive-type pleated paper air filter and foam pre-cleaner, Muffler Included: No, Low Oil Alert: No, Lubrication System: Full pressure, Shaft Rotation (From PTO Shaft Side): CCW, Bore x Stroke (in.): 2.97 x 2.76, Cylinder Bore: Cast iron, Cooling System: Air Cooled, Carburetor: Float, Fuel Pump: Yes, Governor System: Mechanical, Dimensions L x W x H (in.): 18 x 16 x 13.5, EPA/CARB Approval (California Air Resource Board): Yes Magnetron® electronic ignition Dual-Clean™ air cleaner; float carburetor Full-pressure lubrication Electric start with 16 Amp DC alternator