Here is a reverse MO! question answer. This time it was MO! calling out to all those scootdawgs out there who might know why so many belts are broken on certain scooters. This was a reply from someone who kept breaking belt after belt, and seemed to try everything, then after he changed the rear clutch/pulley assembly, he wrote back this reply below. It seems that the inner bearing would pit and run rough, causing excessive heat, and transfering heat to the belt through the rear sheaves of the pulley. Heat and rubber don’t do well together for long!
MO! It (rear clutch/pulley) was causing all the heat (a bad needle bearing in the clutch), and I have about 500 miles on my scooter since replacing the clutch with the one I purchased on your site, and it’s running great, so you my want to advise people to pull the clutch as part of their normal maintenance routine (every 1,500 – 2,000 miles should suffice), and feel if the bearing has any rough spots in it; this can easily be done by inserting your index finger into the bearing and spinning the clutch on your finger, and if the bearing does not roll freely, or you can feel any rough spots in it, it’s probably getting close to time to change the bearing (if you can find one), or the clutch, because you can warn them if they don’t, they’ll probably be pushing their scooter home from wherever they are when the heat from the bad bearing, melts the belt. -helpful scootdawg no longer changing belts all the time!