Welcome Kymco Owners!
I have to squeeze the belt together a couple of times in the middle to get the belt to slide off the boss after I pull the var outside plate off. It is all the way down and tight.
..oh, sh**!!...good pic!!...i see at least part of your problems.....you have restristed driven pulleys.....the inner diameter of the pulleys should taper down, uninteruppted, all the way to the driven pulley's "hub"...
..it was 102 on my porch when i got home from work.....brought nina inside....
She tends to get the vapors...