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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 .
Those in several underbone motorcycles in the 1970s; the Suzuki FR50, Suzuki FR80, and Yamaha Townmate used 3-speed transmissions with a heel-and-toe gear shift. Some high-performance sport bikes use a trigger-shift system, with a handlebar-mounted trigger, paddle, switch, or button, and an automatically operated clutch. [13] [106] [107]
In a 2006 road test, Motorcycle Cruiser magazine recorded a quarter mile time of 16.35 sec at 77.2 mph. Average fuel mileage for the S40 was 52.9 mpg. [ 4 ] The S40's "thumper" engine (single-cylinder, four-stroke), is among the largest displacement single cylinder motorcycle engines in production as of 2018, alongside the Suzuki DR650SE and ...
Some (mostly smaller) motorcycles, and many scooters use either a continuously variable transmission, or a hydraulic automatic transmission. semi-automatic transmissions are also in use; where the driver's input is still required for shifting gears, but the clutch system is controlled and operated automatically.
In 1923, a patent was approved in the United States describing the operation of a transmission where the manual shifting of gears and manual operation of a clutch was eliminated. This patent was submitted by Henry R. Hoffman from Chicago and was titled: Automatic Gear Shift and Speed Control. The patent described the workings of such a ...
Gear shift lever on a motorcycle (above the toe of the rider's boot) A sequential manual transmission is unsynchronized, and allows the driver to select either the next gear (e.g. shifting from first gear to second gear) or the previous gear (e.g., shifting from third gear to second gear), operated either via electronic paddle-shifters mounted behind the steering wheel or with a sequential ...