Briggs & Stratton 21R707-0143-F1 Vertical OHV Intek Engine, 344cc, 1″ x 3-5/32″ Crankshaft, 7/16″-20 Drilled & Tapped, 1/4″ Square Keyway, Remote Stop, 2.8qt Fuel Tank, 9 Amp DC Alternator