Briggs & Stratton 20S232-0036-F1 305cc 1450 Series Engine with 1-Inch Diameter X 2-29/32-Inch Length Crankshaft, Tapped 3/8-24 Dura-Bore cast iron cylinder sleeve for extended life Maintenance-free Magnetron electronic ignition for quick, dependable starts Overhead valve design for cooler operation and longer valve life Dual-Clean air cleaner pleated paper filter with a foam pre-cleaner ensures maximum protection for extended engine life CARB Compliant