1939 Gillet Herstal 720 AB, Belgium. The sturdy demountable tubular duplex frame carried a two-stroke engine (728 cc, 22 h.p. at 4000 rpm) with two vertical parallel cylinders. The crankshaft had two toggles turned under the 180-degree angle towards one another. A 4-speed gearbox with additional rev … baca lanjutannya ►