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minibike
A minibike, sometimes called a minimoto or pocketbike, is a miniature motorcycle. Most minibikes use two-stroke engines and chain drive.
== History ==
Like go-karts, the first minibikes were made by enthusiasts from spare parts found in their garages. They were first popularly used as "pit bikes", for drag racers to travel in the pits during races in the late 1950s. They were very useful for this purpose, as they could maneuver very well in the tight pit roads, fit in about the same space as a small bicycle in a trailer or pickup, and they were faster than most previous forms of transportation. As racers brought them home and used them around their neighborhoods, many children liked the idea of having a mini motorcycle and started building their own. Plans to build one from a bicycle were available at a nominal fee from Popular Mechanics magazine. All you needed was the engine from the family lawnmower and a neighbor with a welding torch. A market for minibikes developed and many cottage and major industries developed to meet the demand. Most lawnmower shops began carrying a line of the mini-bikes. Minibike companies include Arctic-Cat, Rupp, Taco, Heath, Gilson, and Fox, many of which also made other power toys such as go-karts, trikes and choppers. The peak of the minibike/go-kart era was from the late 1960s to the early 1970s in America. Many of the brands, foremost Rupp, have gained a cult-following of enthusiasts and owners.
;Early minibike power train
These early minibikes usually had of a power train with a small four-stroke, horizontal crankshaft, flathead engine. The transmission usually was of a crank-mounted centrifugal clutch and chain drive to a rear sprocket. As the minibike and the mini-powersports field grew, Comet introduced a continuously variable transmission, much like a snowmobile's, called the Torque-a-Verter, which automatically adjusts gear ratios, resulting in better top speed and acceleration.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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