I have around 12,000 km on mine. I had my rollers and belt replaced about a year ago and they showed me my rollers back then and they were flattened out, so just getting ready for the winter, decided to go ahead and replace. Rollers needed it, 3 out of 6 had flat spots, but the belt seemed fine. I went ahead and put on the new one and keeping the other one as a spare for later down the road. The scoot is running a little sluggish as of lately, and I am just doing little things to see if it fixes it. I think my jet or carb needs adjusted/cleaned. It will idle die on me at stop lights and signs, I have to keep revving it to keep it from dying. I know belts and rollers have nothing to do with that, but I already had the parts so....
didn't have time to do a clean up, but I plan to soon and will take pics and post. Got busy with other stuff and it is rainy and cold out.