Briggs and Stratton 21M314-3017-F1 305cc 14.50 Gross Torque Snow Series Max Engine with A 3/4-Inch Diameter x 2-33/64-Inch Crankshaft 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 Freeze-resistant recoil starter with over-sized mitt0grip rewind handles 50-State emissions compliant