Briggs & Stratton 356776-0006-G1 570cc 18.0 Gross HP Vanguard Engine with 1-Inch Diameter by 3-5/32-Inch Length Crankshaft, Tapped 7/16-20-Inch, 1/4-Inch Keyway Dura-Bore cast iron cylinder sleeve for extended life Dependable float feed type carburetor with integral fuel pump for remote mount fuel tank Dual-Clean air cleaner pleated paper filter with a foam pre-cleaner ensures maximum protection for extended engine life Full pressure lubrication with spin-on oil filter assures controlled lubrication for extended component life Overhead valve design (OHV) for cooler operation and longer valve life