Harley-Davidson rarely rushed change, and it always knew the value of cubic inches. The history of the 45° F-head V-twin goes back to the original prototype twin of 1907, and by 1928 it was approaching its sell-by date. In 1922 Harley created the JD model by increasing capacity from 61 to 74 cubic inches. The result was a high-performance machine capable of outrunning almost any other vehicle on
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