Briggs and Stratton 121Q02-2025-F1 850 190cc Professional-Series Commercial Replacement Push Mower Engine, 25mm by 3-5/32-Inch Shaft Large rewind starter reduces pulling effort for easy starting Cast iron cylinder sleeve for extended commercial life Ready Start provides easy no prime/ no choke starting Limited Warranty, 2-years consumer use and 90-days commercial use Emission compliant - for sale in all 50-states