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|Engine||440cc single-cylinder four-stroke engine|
|Top speed||56 km/h (35 mph)|
|Power||3 kW (4 hp)|
William S. Harley and Arthur Davidson developed the first prototype of a motorcycle in 1903. The engine was designed according to the system De Dion-Bouton, had a displacement of 167 cc and made about 2 ps (1.5 kw). Since Harley and Davidson were dissatisfied with the performance, in 1904, cubic capacity was increased to 405 cm³ at one of bore 76 mm and one stroke 89 mm. From this pre-production model came two copies.
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