Briggs & Stratton 356447-0048-G1 Vertical Vanguard Engine, 570cc, 18.0 Gross HP, 1″ x 3″ Crankshaft, 1/4″ Keyway, 3/8″-24 Drilled & Tapped, 12 Volt Gear Drive Starter with 16 Amp DC Alternator, No Muffler and No Fuel Tank