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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.
Semi-automatic motorcycle transmissions are based on conventional sequential manual transmissions and typically use a centrifugal clutch. [34] At idle speed, the engine is disconnected from the gearbox input shaft, allowing both it and the bike to freewheel , unlike with torque converter automatics, there is no idle creep with a properly ...
Three-speed sliding-gear non-synchronous transmission Non-synchronous "crash" gearbox; commonly used today in semi-trucks and tractors, and formerly used in automobiles pre-1950s. A non-synchronous transmission, also called a crash gearbox, is a form of manual transmission based on gears that do not use synchronizing mechanisms. They require ...
A dual-clutch transmission (DCT, sometimes referred to as a twin-clutch transmission, or double-clutch transmission) uses two separate clutches for odd and even gear sets. [36] The design is often similar to two separate manual transmissions with their respective clutches contained within one housing, and working as one unit.
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.
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 ...
The V-Strom 800 has a 6-speed gearbox with a so-called "quickshifter", which allows gear changes without manual clutch operation. [2] The drive is electronically supported with a four-stage slip control (on the 800 DE with mode for gravel [G, Gravel] for limited slip), [4] automatic start and speed increase when starting (Low RPM Assist).
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 E (economy) model had wire wheels and drum brakes, while the others had Comstar wheels and a front disc/rear drum braking setup.