Yeah that didn't go as well as I hoped, Vivo.
The 815 20 30 Chinawango belt was noticably softer and rubbery than the 23100 KEC4 9000 Bando OEM belt, but very close in overall size. It was a little longer, which I wanted, to allow it to ride up higher on the variator.
So I mounted it with 14 gram rollers in a Koso performance variator, and it worked OK on take off, but the 14 gram rollers dampened the overall RPMs too much, and top end was a slow climb to 60 MPH.
My son came by and wanted to learn about the CVT so he could work on a scooter some Harley dude had, so I opened the Super 8 up again and put 13 gram rollers and the original Bando belt back in while I explained all the functions and ran it up to speed on the center stand so he could see it.
Imagine my surprise when the stock 13 gram rollers and the OEM Bando belt had a snappy takeoff, a virile midrange, and a sturdy top end to 63 MPH when I ran out of road. Here I was dicking around with all my clever notions, when the Kymco engineers had already produced the optimum combination. Durrr.
The cheapo belt would serve as an emergency replacement, but for reliable, competent service, get the original, even if it costs $60.