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Semi-automatic transmissions were almost exclusively used in motorcycles and are based on conventional manual transmissions or sequential manual transmissions, but use an automatic clutch system. But some semi-automatic transmissions have also been based on standard hydraulic automatic transmissions with torque converters and planetary gearsets ...
They are much less common than motorcycles with conventional manual transmissions, typically use a centrifugal clutch, and are mostly found on smaller motorcycles, such as minibikes, underbone (step-thru) motorcycles (e.g., the Honda Super Cub), smaller dirt bikes (such as pit bikes), and various (mostly older) mopeds and motor scooters. Semi ...
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. These systems are mostly found on smaller dirt bikes (e.g., minibikes; such as pit bikes), underbones, many older mopeds and scooters, and various other types of motorcycles.
Some motor scooters include a centrifugal clutch, to assist when idling or manually reversing the scooter. [48] The 1974 Rokon RT340 TCR Automatic off-road motorcycle was fitted with a snowmobile CVT. The first ATV equipped with a CVT was the Polaris Trail Boss in 1985. [citation needed]
The CVT drive belt would derail and seize the transmission and the rear wheel, disabling the scooter and also preventing it from being pushed. Also, the starting procedure for the Tina required moving a switch on the handlebar to "start" before kick starting the scooter; this activated a governor to keep the engine speed too low to activate the ...
Clutch control is the controlling of the speed of a manual transmission vehicle by partially engaging the clutch plate, using the clutch pedal instead of (or in conjunction with) the accelerator pedal. The purpose of a clutch is in part to allow such control; in particular, a clutch provides transfer of torque between shafts spinning at ...
Depending on whether the motorcycle has a manual hand clutch or an automatic centrifugal clutch, determines whether the motorcycle transmission is a semi-automatic (automatic clutch) or a manual transmission. It is then coupled to a sprocket and chain drive to transmit power to the rear wheel.
A scooter (motor scooter) is a motorcycle with an underbone or step-through frame, a seat, a transmission that shifts without the operator having to operate a clutch lever, a platform for their feet, and with a method of operation that emphasizes comfort and fuel economy. Elements of scooter design were present in some of the earliest ...