In the above pic, you can see what is left of the rubber belt. Trust me, its not supposed to look like that. In the pic above that, you can see the remants of what the belt USED to look like, sitting at the bottom of the engine casing. Wows!
This belt failure may have been a fluke, but either way its smart to keep your bike happy by getting it serviced when you are supposed to! It's the best way to keep the above from happening to you when you least expect it!