Briggs & Stratton 5 HP Quantum Vertical Engine. Quantum engines are designed with performance and dependability in mind. Known for easy starting and power, Quantum engines also have larger muffler for quiet operation. Prime N Pull easy starting system delivers the right amount of fuel to the carburetor for consistent one-pull starts. U.S.A. Displacement (cc): 190, HP: 5, Application: Walk mowers, Torque (ft./lbs.): 6.75, Shaft Output: Vertical, Engine Type: OHV, Start Type: Recoil, Shaft Dimensions Diameter x L (in.): 7/8 x 1 13/16, Mounting Base L x W (in.): 8, Shaft Keyway (in.): 3/16, Shaft End Tapped (in.): 3/8-24 and 2 woodruff key slots, Max. RPM: 3,100, Ignition System: Magnetron® Electronic, Cylinders (qty.): 1, Fuel Tank Capacity (qt.): 1.6, Oil Capacity (qt.): 1.25, Air Cleaner Type: Automotive-type pleated paper air filter, Muffler Included: Yes, Low Oil Alert: No, Lubrication System: Gear driven, Shaft Rotation (From PTO Shaft Side): CCW, Bore x Stroke (in.): 2.69 x 2.04, Cylinder Bore: Aluminum alloy, Cooling System: Air Cooled, Carburetor: Float, Governor System: Mechanical, Flywheel Brake: Yes, Auto Compression Release: Yes, Dimensions L x W x H (in.): 13 x 11.5 x 9.75, EPA/CARB Approval (California Air Resource Board): No Displacement: 11.57 cu. in. Large rewind starter Magnetron electronic ignition system ensures dependable starts Composite camshaft & aluminized lo-tone muffler results in a corrosion-resistant, quiet running engine Mechanical governor controls the throttle to deliver more power for heavy mowing conditions Mechanical compression release provides smooth, easy starts and ensures engine reaches maximum power instantly Lubrication system is gear-driven to continuously supply oil to all internal engine parts for extra protection and long life