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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 .
BMW Motorrad began manufacturing RT (Reise-Tourer, or travel tourer) touring motorcycle models in the late 1970s.The first of these were air-cooled (or "airhead") models that continued BMW's long tradition dating to 1923 of producing "boxer" or opposed flat-twin engined motorcycles with unit engine-transmission construction and shaft-final-drive.
Simplified control. Operation through the full range of forward and reverse speeds can be controlled using a single lever or a foot pedal to actuate a diversion valve or variable-displacement pump. Arbitrarily slow crawl speeds. The potential for high torque multiplication at very low speeds allows for precise vehicle movement while under load.
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 ...
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 ...
Quickshifter on a BMW S1000RR motorcycle. A quickshifter or quick shifter is a device that eliminates the need to use the clutch or throttle when shifting gears on a manual transmission . This can increase the safety and comfort of the vehicle [ 1 ] and allow for faster gear shifting (usually shifting in less than 50 milliseconds) and is thus a ...
The dual clutches are able to switch quickly between gears and can operate in one of three modes: 'D', which is a fuel-efficient fully automatic mode; 'S', a sports automatic mode, which changes gear at higher engine speeds; and manual mode, in which the rider changes gear using paddles fitted to the handlebars.
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.