Briggs & Stratton 21R707-0011-G1 10.5 Gross HP Engine with 1-Inch by 3-5/32-Inch Length Crankshaft Tapped 7/16-20-Inch Cast iron cylinder sleeve and dual element air filter for extended engine life Overhead valve design (OHV) for cooler operation and longer valve life Float carburetor for consistent, easy starting. Dura-lube gear-driven splash lubrication continuously applies oil to all internal parts Patented linear balancing system provides smoother performance CARB compliant