c1914 Harley-Davidson Model 10F 1000cc Motorcycle

Description

The story of Harley-Davidson's twins dates back to the first Model D of 1909. With the early single-speed belt-driven twin proving troublesome, few were sold until a heavily revised version appeared in 1911. A new frame was introduced in 1912, along with a free-wheel hub and a 61-inch (one-litre) version of the F-head engine, now with chain final drive, roller and ball crankshaft bearings and the use of more exotic alloy steel for the engine components. Although basic in terms of equipment, it was possible to order an optional Acetylene lighting kit and alongside the solo motorcycle, Harley built the ?Forecar? with a front-mounted luggage box for tradesmen. For 1914 a complex new two-speed hub featuring five bevel gears was announced and production rose accordingly - in 1913 the twins outsold the single Harley for the first time - and within twelve months a more conventional three-speed gearbox had been adopted. Major redevelopment of the Juneau Avenue plant by 1914 helped this rapid expansion and the Harley-Davidson company had, in ten short years, become world famous. The twins continued to evolve until the model was ultimately discontinued in 1929.