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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 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 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.
This unit was an early semi-automatic transmission, based on the design of a conventional manual transmission, which used a servo-controlled vacuum-operated clutch system, with three different gear shifting modes, at the touch of a button; manual shifting and manual clutch operation (fully manual), manual shifting with automated clutch ...
The designers at Moto Guzzi were aiming the V1000 Convert at the US police motorcycle market and were the first to produce a big capacity automatic motorcycle with shaft drive. Moto Guzzi increased the pushrod-operated V-twin's bore and stroke to give a displacement of 949 cc (57.9 cu in), and replaced manual gearbox with a torque converter ...
Shifting in this manner is also used with synchronous manual transmissions, particularly after a clutch failure, to prevent destroying the synchromeshes with the power of the engine. Drivers can shift non-synchronous transmissions without using the clutch by bringing the engine to exactly the right RPM in neutral before attempting to complete a ...
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.
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