As part of war reparations, Harley-Davidson acquired the design of a small German motorcycle, the DKW RT125 which they adapted, manufactured, and sold from 1947 to 1966.[29] Various models were made, including the Hummer from 1955 to 1959, but they are all colloquially referred to as "Hummers" at present.[30] BSA in the United Kingdom took the same design as the foundation of their BSA Bantam.[31]
In 1960, Harley-Davidson consolidated the Model 165 and Hummer lines into the Super-10, introduced the Topper scooter, and bought fifty percent of Aeronautica Macchi's motorcycle division.[32] Importation of Aermacchi's 250 cc horizontal single began the following year. The bike bore Harley-Davidson badges and was marketed as the Harley-Davidson Sprint.[33][34] The engine of the Sprint was increased to 350 cc in 1969 and would remain that size until 1974, when the four-stroke Sprint was discontinued.[35]
After the Pacer and Scat models were discontinued at the end of 1965, the Bobcat became the last of Harley-Davidson's American-made two-stroke motorcycles. The Bobcat was manufactured only in the 1966 model year.[36]
Harley-Davidson replaced their American-made lightweight two-stroke motorcycles with the Aermacchi-built two-stroke powered M-65, M-65S, and Rapido. The M-65 had a semi-step-through frame and tank. The M-65S was a M-65 with a larger tank that eliminated the step-through feature. The Rapido was a larger bike with a 125 cc engine.[37] The Aermacchi-built Harley-Davidsons became entirley two-stroke powered when the 250 cc two-stroke SS-250 replaced the four-stroke 350 cc Sprint in 1974.[38]
Harley-Davidson purchased full control of Aermacchi's motorcycle production in 1974 and continued making two-stroke motorcycles there until 1978, when they sold the facility to Cagiva.[32]
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