Briggs & Stratton 121Q02-2015-F1 Gross Torque Woodruff Key and Keyway Crankshaft Power Tool Stroke Engine Cast iron sleeve assures longer engine life Advanced Debris Management System allows the engine to run cleaner and cooler Certified to CARB Tier III and meets EPA 2012 Phase 3 Standards Maintenance-free Magnetron electronic ignition for quick dependable starts Commercial grade air cleaner with dual seals for longer engine life