A Honda Cub does not need a hand lever to press to change gears but the user can still change gears manually by pressing on a foot clutch. Why cant they just replace all manual transmission motorcycles (with hand lever clutch and foot pedal clutch) to semi automatic (no hand lever, but with foot pedal clutch)?
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The Honda Cub use a centrifugal clutch. It uses engine speed to engage the clutch. So when idling the clutch is disengaged and when you rev up the clutch automatically engages. This is actually a very common type of clutch used on a lot of smaller engines from lawn mowers, motor saws, go-carts, to small motorcycles. The problem is that it is not a very good clutch. It will basically dump the clutch when you give it throttle, and if you try to do it carefully it will slip the clutch for too long. It only works because the engine does not have enough power to damage the clutch, gearbox or to spin the tire. Any larger engines will not work with this type of clutch.
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