Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: A shekara ta 1901, William S. Harley ɗan shekara 20 ya tsara wani ƙaramin injin da ƙarfinsa ya kai inci 7.07 (kwatankwacin inci 116) da kuma ƙafafun ƙafafu huɗu (102 mm) da aka tsara don amfani da su a cikin keken keke na yau da kullum. A cikin shekaru biyu masu zuwa, shi da abokinsa na ƙuruciya Arthur Davidson sun yi aiki a kan babur-babur ta amfani da kantin sayar da injin Milwaukee na arewa a gidan abokinsu Henry Melk. An gama shi a 1903 tare da taimakon ɗan'uwan Arthur Walter Davidson. Bayan gwada keken su na lantarki, Harley da 'yan uwan Davidson sun gano cewa ba zai iya hawa duwatsu a kusa da Milwaukee ba tare da taimakon ƙafafun ba, kuma sun rubuta babur ɗin su na farko a matsayin gwaji mai mahimmanci. Su ukun sun fara aiki a kan sabon injin da aka inganta tare da injin 24.74 cubic inci (405 cc) tare da inci 9.75 (25 cm) mai nauyin fam 28 (13 kg). Tsarin sa mai ci gaba ya yi kama da babur din Milwaukee Merkel na 1903 wanda Joseph Merkel ya tsara, daga baya ya zama sanannen Flying Merkel. The ya fi girma engine da madauki-frame zane dauki shi daga motorized keke category da kuma alama da hanyar zuwa nan gaba babur kayayyaki. Sun kuma sami taimako tare da injin su mafi girma daga majagaba na injin waje Ole Evinrude, wanda a lokacin yake kera injunan gas na ƙirar kansa don amfani da motoci a kan titin Lake Street na Milwaukee.  Tambaya: Shekaru nawa ne William da Arthur suka yi suna aikin babur ɗin?
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