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Underbone and miniature motorcycles often have a three to five-speed foot-shift lever, but the clutch is automatic (usually a centrifugal clutch). This type of clutchless (no manual clutch) transmission still must have the gears shifted manually by the rider, and the system is commonly known as a semi-automatic transmission.
An early example of a semi-automatic motorcycle transmission was the use of an automatic centrifugal clutch in the early 1960s by the Czechoslovakian manufacturer Jawa Moto. [83] Their design was used without permission in the 1965 Honda Cub 50 , which resulted in Jawa suing Honda for patent infringement and Honda agreeing to pay royalties for ...
The original Servi-Cycle design had the engine drive the rear wheel by belt, with no transmission or clutch, requiring the engine to be shut off while the cycle is at rest. [8] In 1941, a pedal-operated clutch was added. [10] By 1950, Simplex added a belt-type automatic transmission.
Automated manual transmissions can be semi-automatic or fully-automatic in operation. Several different systems to automate the clutch and/or shifting have been used over the years, but they will generally use one of the following methods of actuation for the clutch and/or shifting: hydraulic or electro-hydraulic actuation, [12] electro-mechanical, [13] pneumatic, [6] [14] [15] electromagnetic ...
Clay Ridley began experimenting with automatic transmissions in motorcycles in 1995, when building them for his sons as a hobby. [2] Although the vast majority of cars and light trucks sold in the U.S. use automatic transmissions, no two-wheeled vehicles larger than a scooter did, and so to capitalize on that market, he and his son Jay founded the Ridley Motorcycle Company in 1997, which ...
The CM400 series includes only a speedometer and three indicator lights (neutral, oil pressure, high beam) with a tachometer for the C and T models. The A (automatic) model has a gear indicator (N/1/2) in place of the tachometer and an additional indicator light for the parking brake, which is used since the A models have no manual clutch.
The M6 Presto-Matic was a Chrysler Corporation semi-automatic transmission produced from 1946 to 1953. It was a special manual transmission with a fluid coupling.Although it had just two forward gears, an electric overdrive unit was attached and useful in either gear for a total of four forward speeds.
The cylinders could be disassembled without having to remove all the wheel spokes to reach them. The lack of a clutch meant the engine had to be stopped when the cycle was stationary. [3] As an alternative, the owner's manual suggested the rider make small orbits in the road if at any point they had to halt. [5]