Briggs & Stratton 44S877-0001-G1 724cc 24.0 Gross HP Professional Series, 1-1/8-Inch Diameter by 4-5/16-Inch Length Crankshaft, Keyway and Tapped 7/16-20-Inch Mechanical compression release for easy, reliable starting Chrome plated exhaust valves reduce valve wear providing longer life Premium high capacity air, oil and fuel filters provide longer maintenance intervals and more engine protection Super-finished crank pin bearing for reduced friction and wear Advanced Debris Management System with a dual seal, cartridge-style air filter provides maximum protection and extends engine life