William S. Harley
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William Sylvester Harley was an American mechanical engineer and businessman. He was one of the four co-founders of the Harley-Davidson Motor Company.
William S. Harley
William Sylvester Harley headstone
Monument in Littleport, England. The birthplace of his father William Harley Sr.
The knucklehead is a retronym used by enthusiasts to refer to a Harley-Davidson motorcycle engine, so named because of the distinct shape of the rocker boxes. The engine is a two-cylinder, 45 degree,
William S. Harley
…their motorcycles until his death in 1943, and is credited with the invention of the first true motorcycle clutch, as well as the company's first Big Twin engine for the 1936 EL "Knucklehead". In 1910 he married Anna Jachthuber, with whom he had two sons and a daughter. In his spare time, Harley took up hunting…
Harley-Davidson Knucklehead engine at the Harley-Davidson Museum
Harley-Davidson knucklehead motor