Briggs & Stratton 219907-3029-G5 344cc 12.5 Gross HP Engine with 1-Inch by 3-5/32-Inch Length Crankshaft Tapped, 7-16-20 Maintenance-free Magnetron electronic ignition for quick, dependable starts Overhead valve design (OHV) 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 Platinum spark plugs for extended life Buyer protection package provides two-year consumer engine warranty