While approaching a toll booth a loud noise suddenly developed, emanating from the centre gearbox area of my engine/drive train. Inspection discovered that the middle drive shaft tip had snapped at the universal joint retaining nut. It is further determined from other such recorded failures posted on various yamaha forums that this failure is caused by micro pressure from rear drive/uni joint onto middle drive shaft and causes stress fracture/separation mid thread level with inside of retaining nut. Hi-res photos are available of the shaft tip still inside the nut showing the casting failure of the shaft. Failure of this nut results in the loose nut containing the tip of the snapped shaft to boune around inside the universal joint, causing damage to the uni joint, speed sensor and speed rotor. Potential is also there for the nut to jam between the uni joint protector cover and the uni joint itself resulting in possible sudden failure of all components. As my VIN could not be entered in the necessary section I have edited this section and provided the detail here.
2002 Yamaha XVS11 transmission complaints
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