Muna 1901, William S. Harley aiva nemakore 20 akatanga kuronga injini duku ine displacement ye 7.07 cubic inches (116 cc) uye ina-inch (102 mm) flywheels yakagadzirirwa kushandiswa mune imwe bhasikoro bhasikoro. Kwemakore maviri akatevera, iye neshamwari yake yehuduku Arthur Davidson vakashanda pamotokari yavo vachishandisa kuchamhembe kweMilwaukee machine shop pamusha weshamwari yavo Henry Melk. Yakagadziriswa muna 1903 nekubatsirwa nemukoma waArthur Walter Davidson. Pavakaedza motokari yavo yemagetsi, Harley nehama dzaDavidson vakaona kuti haikwanisi kukwira makomo akapoteredza Milwaukee pasina rubatsiro rwepedal, uye vakanyora bhasikoro ravo rekutanga semuchina wekudzidza unokosha.
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