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Simplex motor bicycle

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Simplex motor bicycle
Negative #: 64-370-A


This object appears in the following sections:

Smithsonian Motorcycle Collection — Pope, Cleveland, Autoped, and Simplex

The Simplex Crew

Simplex Servi-Cycle
In collection
From the Smithsonian Collection
The Museum's Servi-Cycle, designed by Paul Treen and built by the Simplex Manufacturing Corporation, of New Orleans, Louisiana, features simplicity in every respect. The motor bears the number 19351, indicating that it was built in 1935 and was the first of the series.
Physical Description

The single-cylinder, 2-cycle, 2-horsepower engine is air cooled and equipped with a rotary valve. The tiny carburetor on the back of the motor is controlled by a wire operating from a knob located behind the steering head, and a lever near the right grip operates a compression release.

To start the engine, the operator opens the compression release with his right hand, pushes the cycle to gain speed, then closes the release. A V-belt drive transmits power to the rear wheel. There is no clutch, so the engine must he switched off in stopping. This is accomplished by pressing an electric button, of the type generally used to operate a bicycle horn, located near the left grip. This apparently shorts the low-tension side of the magneto, an Eisemann Model 71L bearing the serial number 2003.

The tires bear the name of the Simplex Manufacturing Company and are marked "26 x 2.250." An ordinary cycle coaster brake, made by Morrow, is operated by a pedal at the left of the engine. The bicycle's stand can be moved up to form a footrest. The gasoline tank is in front of the seat, and the muffler is to the left of the rear wheel. An electric headlamp, mounted on the cycle's spring fork, receives current from the magneto.

Date Made:
Gift of Paul Treen

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