Vehicle report
Technical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
TSB-B-092
BUELL (HARLEY DAVIDSON) MOTORCYCLE: THE MUFFLER SHAFT RETENTION SPRING MAY BE MISSING ON CERTAIN MOTORCYCLE MODELS WHICH CAN CREATE A NOISE THAT MAY BE UNDESIRABLE. IF THERE IS A RATTLING SOUND COMING FROM THE MUFFLER, CHECK TO SEE IF THE SPRING IS IN PLACE. *PE
Complaint counts are reports filed with NHTSA, not failure rates. A common model collects more of them than a rare one that breaks more often.