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Whizzer bicycle engines are a line of bicycle engines that were produced in the United States from 1939 to 1965. They were commonly sold as kits to be assembled and attached to a consumer's bicycle thus creating a motorized bicycle. Whizzer U.S.A. re-appeared in 1997 to sell an improved version, pre-assembled on an old Schwinn-style bicycle frame.
Motorized bicycles have utilized all variety of engines, from internal-combustion (IC) two-stroke and four-stroke gasoline engines to electric, diesel, or even steam propulsion. Most motorized bicycles are based or derived from standard general-purpose bicycle frame designs and technologies, although exceptions abound.
A race kit is available from the manufacturer that boosts power from the standard 15 bhp to 25 bhp. [ 5 ] The RS4 125 is available with a quick-shift system similar to the RSV4 , in which the engine halts the torque from the engine based on engine rpm, the amount of throttle being applied, and the speed of the bike.
1946: A 45 cc model, of which many evolutions were made, with a 45 cc (2.7 cu in) engine developing 0.4 hp (0.30 kW) and no clutch, the engine has to be restarted every time the rider comes to a stop 1953: Model 330 with a 49 cc (3.0 cu in) engine and 0.5 hp (0.37 kW) using the same frame as the 45 but boosting power
Motorcycles with a V-twin engine mounted with its crankshaft mounted in line with the frame, e.g. the Honda CX series, are said to have "transverse" engines, [1] [2] while motorcycles with a V-twin mounted with its crankshaft mounted perpendicular to the frame, e.g. most Harley-Davidsons, are said to have "longitudinal" engines.
[3] [4] [5] 1896 – Roy C. Marks of San Francisco produces the first motorcycle made in the USA. It becomes the California Motorcycle. [6] 1897 – Most likely the first electric bicycle was built in 1897 by Hosea W. Libbey. [7] 1897 – The Werner Brothers of France developed a motorized bicycle with a De Dion-Bouton engine mounted above the ...
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