Mini choppers are scaled-down versions of custom-built motorcycles known as choppers and are generally constructed from 1″ steel tubing or 3/4″ steel black pipe. The tube or pipe is bent and then welded together to get the desired angles and shapes of the frame, which is usually custom made.
Mini choppers use a variety of engines although the most typical would be a Briggs & Stratton or Tecumseh horizontal shaft industrial engine with a non-tapered shaft. Other engines include small motorcycle engines and power sport engines such as ATV and dirt bike engines. If an industrial engine is used,some sort of transmission also needs to be used to apply power to the rear wheel. Centrifugal clutches, which allow the engine to idle without moving the chopper, are also used however they result in a fixed gear ratio for both low and higher speed operation. However, some people opt to make a jackshaft, which allows the builder to change the gear ratio to his liking or to change which side the axle sprocket is on.
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