I've had this on my mind for a couple of days now, but can't seem to come up with anything,, can't seem to get it down either, but then I don't have a scooter to look at and define the issue, if it is definable.
Check out the TCI, located under the battery box. Maybe it just the connection being wet or loose, maybe you have internal problems. Do a search on TCI.
Lots of tension, a good strap and a box of rags to catch the results. Now a good solid punch and a heavy hammer and rap the clutch with the punch and hammer right close to the shaft. Might help.