but it's a SHIFTING clutch, not a two speed automatic clutch.. which is kindof nice actually...
the only thing that concerns me really is how it works..
I mean the smaller drum not only moves by .25" or more which messes with chain alignment..
(especially on short chains that's not good)
it also engages with the larger drum (or rather the sidewall of the clutch shoes)
very little contacting surface, and that means excessive wear.
and it's not exactly positive engagement either, it relies solely on the force applied through the shifting cable...
which opens another can of worms (heat creation instead of power transmission thanks to "feathering it")
I think I know why this thing is no longer being made
'sid