I don't mess with the friction surfaces of the clutch if it's working smoothly - but I do change the belt as per the Kymco replacement schedule.
I face a few situations every ride where total loss of drive would be really hairy!
Stig
For sure. Also, there is a hidden danger in the scooter belt drive system. If you are driving over ~ 15 mph and you turn off the engine with the kill switch the transmission is still engaged forcing the engine to move just like a motorcycle with gears.... but if the the belt drive system ever jammed unlike a motorcycle you could not pull the clutch lever in and disengage it so the rear tire would lock likely causing loss of control.
I did not want to weld the clutch assembly but the online parts show the 38mm nut to be unavailable. So not having confidence about replacement parts and not wanting the scooter in an unusable condition led me down the current path.