Advice on belts----after 11 new rubberband drive scooters and over 400,000 miles with them---change at maker's recommended distance and with OEM belt---not cheap if you ride a lot but better than walking! Had one belt break, Helix in VA---Helix belt easy to change as front pulley does not have to come off, belt went on rear by squeezing clutch, block with piece of wood.
I always carry spare belt as dealers probably do not have belt in stock. I find delays on trip can get expensive if you are not prepared!
Now as I know many here do not ride big miles, there is another thing to consider on belts=AGE. For me more than 4 years old, change belt!