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As I’m sure you know, a motorcycle gearbox is constant mesh, no synchromesh or baulk rings etc.
All of us have been doing clutchless up shifts for years, you roll off momentarily which unloads the ‘box and allows you to lift the selector and effectively crash the next gear. Because there are only dogs to engage it doesn’t sound or feel bad
So logically a down change should work the same, the ratios are no different and the gears are already in mesh
The problem is that you would need to blip the throttle to unload the ‘box and to match revs as you crash the next gear down at exactly the right moment and just long enough so as not to re-accelerate as you shift
You almost certainly can’t do that with your throttle hand which is why you don’t do clutchless downshifts, but a quickshifter can
Yeah I know, but the question still remains, do bikes with an auto blipper for downshifts also need a slipper clutch? Are there any modern bikes that have an auto blipper without having a slipper clutch?