I heard in the past there are a few Yamaha bikes which seem to have gearbox problems and its seems to be 2nd or3rd gear.XT600's Thundercat and some TDM's.
Now if this is related to the way they are built or to rider abuse not sure.
Which brings me to say i have a Haynes Thundercat/Fazer Manual if anyone wants it for zilch.Pm me if any one is interested .