ah, so like a go-kart then?
Not exactly. On a go kart (at least the one I had) the throw weights double as the friction. On the CT90 (whch I had one with a Powroll 110cc kit) the clutch friction part looks like a conventional clutch. IIRC The throw weights don;t double as part of the friction drive mechanism.
Also, on the CT90 part of the throw of the shifter does duty as a "clutch lifter" like pulling in the lever/ cable. Again, IIRC.
The CT90 is not so much an automatic as it is a clutch lever-less transmission. YOu still have to push a shift pedal and things are still happening like a conventional system, with a minimum of exceptions.
An example, if you depressed the shift pedal all the way, you could rev it to the redline. Then allow the shift pedal to return to its relaxed position. THis would engage the clutch a pop a wheelie.