Looking for Answers about Briggs & Stratton Intek Vertical OHV Engine with Electric Start - 21 HP, 1in. x 3 5/32in. Shaft, Model# 331877-3036-G5?

Briggs & Stratton 21 HP Intek® Vertical OHV Engine with Electric Start delivers top reliability, performance and durablity to meet the demands of professionals.The OHV engine features a pressure lubrication system with an automotive full-flow style spin-on oil filter that cleans contaminants from the oil. U.S.A. Engine Displacement (cc): 540, Start Type: Electric, Application: Riding lawn mowers and lawn tractors, Engine Type: Intek-OHV, Rated Power (HP): 21, Shaft Output: Vertical, Crankshaft: Tapped 7/16-20, keyway, 1 in. dia., Shaft Diameter (in.): 1, Shaft Length (in.): 3 5/32, Shaft Keyway (in.): 1/4, Shaft End Tapped (Diameter (in.)/Threads per inch): 7/16-20, Shaft Rotation (From PTO Shaft Side): Counterclockwise, Bearing Type: Plain, Cylinders (qty.): 1, Cylinder Bore: Cast iron, Bore x Stroke (in.): 3.70 x 3.06, Cooling System: Air cooled, Air Cleaner Type: Dual element, Fuel Tank: Not included, Fuel Type: Gasoline, Fuel Pump: Yes, Pulse, Fuel Filter: Yes, Oil Capacity (qt.): 1.5 (48 oz.), Lubrication System: Full pressure, Low Oil Alert: No, Low Oil Shutdown: No, Ignition System: Electronic, Governor System: Mechanical, Carburetor: Float, Throttle Control: Remote, Choke Control: Manual, Max. RPM: 3,300, Charging System Amps: 9, Muffler Included: Yes, Auto Compression Release: Yes, Bolt Circle (in.): 10, Dimensions L x W x H (in.): 19 x 16 1/2 x 13, EPA/CARB Approval (California Air Resource Board): Yes Advanced debris management system with dual-sealing cartridge-style air filter for maximum protection and extended engine life  AVS® antivibration system eliminates side-to-side motion of a traditional counter and rotating balance system  Easy-to-use automotive-style dipstick Dura-Bore™ cast iron cylinder sleeve stands up to wear and abuse while providing improved oil control Dura-Lube™ gear-driven splash lubrication system continuously supplies oil to all internal parts Heavy-duty Teflon®-coated bronze sleeve bearing reduces wear and withstands twice the belt load of standard bearings High-capacity panel air cleaner element for greater cleaning capabilities and longer engine life  High-volume cooling fan keeps the engine running cooler  Magnetron® electronic ignition for quick, dependable parts  OHV design for high fuel efficiency and long engine life  Pressure lubrication system with spin-on oil filter for controlled clean oil flow to lower bearings to decrease wear   Easy-access tool-less air cleaner cover