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The Knucklehead That Changed the History of Japan

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In 1936, Harley-Davidson began producing motorcycles powered by their new “Knucklehead” engine.  The Knucklehead was a major leap forward in engine design, going from the older side valve arrangement to one in which the valves were located over the piston.  The basic overhead valve layout is still used today in all current Harley-Davidson engines.  The […]