Briggs & Stratton 15T212-0026-F8 XR Professional Series 11.50 Gross Torque Engine, 250cc, 25/32″ x 2-13/16″ Tapered Crankshaft, 5/16″-24 Drilled & Tapped, Fixed Speed, Manual Choke, Flange Mounting, Rocker Stop Switch, 3.2 qt Fuel Tank