Briggs & Stratton 356442-0667-F1 Horizontal Vanguard OHV Engine, 1″ x 3″ Crankshaft, 3/8″-24 Drilled & Tapped, 1/4″ Keyway, 570cc, 18.0 Gross HP, Fuel Pump, No Muffler, Recoil Start, Replaces 356442-0565-F1