NHTSA Complaint #10565904 — 2006 YAMAHA XVS1100

WHILE TRAVELING AT APPROXIMATELY 45 MPH THROUGH CURVES AND HILLS, WITH VARIOUS LEVELS OF LOAD ON THE ENGINE AND DRIVE TRAIN, A LOUD BUZZING/WHINING NOISE WAS BEING PRODUCED FROM THE ENGINE AREA ACCOMPANIED WITH SPEEDOMETER FAILURE WHEN ENGINE AND TRANSMISSION WERE PUT UNDER LOAD. WHEN ENGINE AND DRIVE TRAIN WERE UNDER NO LOAD (COASTING), THE SPEEDOMETER WOULD OPERATE NORMALLY. INSPECTION OF ENGINE/TRANSMISSION AND FINAL DRIVE FLUIDS REVEALED EVERYTHING TO BE WITHIN SPECIFICATIONS. WHEN THE MOTORCYCLE WAS RESTARTED AND OPERATED AGAIN, THERE WAS NO NOISE PRODUCED AND APPEARED TO OPERATE NORMALLY. THREE MONTHS LATER THE SAME ISSUE PRESENTED ITSELF WITH THE SAME SYMPTOMS, BUT WENT AWAY AFTER INSPECTING THE MOTORCYCLE. TWO MONTHS LATER, THE ISSUE HAPPENED AGAIN AND THE MOTORCYCLE WAS TAKEN TO A MECHANIC. THE MECHANIC DISCOVERED THAT THE NUT HOLDING THE YOKE TO THE MIDDLE DRIVE SHAFT/PINION GEAR HAD LOOSENED APPROXIMATELY THREE THREADS. *TR