26-02-13, 10:49 AM
Do you have the damper plate on your sprocket cover? I know some Fazers were sold without it, I was lucky that mine came with one (though not the damper rubber that should have been underneath). When my sprocket nut came loose it wasn't able to come off the end of the shaft because the plate is near enough to prevent that (even with the old, thinner nut).
It first happened to me before Yamaha had acknowledged there was a problem. I replaced the nut and washer several times before deciding that the soft nut material and fine thread meant it wasn't up to the job... at which point I welded the bugger on. However, my last 50-ish thousand miles I've done has been with the bigger nut rather than a welded solution.
So I'm confident in the safety of it: even if the nut fails it won't let the sprocket fall off the splines because the damper plate will keep everything on the shaft.
It first happened to me before Yamaha had acknowledged there was a problem. I replaced the nut and washer several times before deciding that the soft nut material and fine thread meant it wasn't up to the job... at which point I welded the bugger on. However, my last 50-ish thousand miles I've done has been with the bigger nut rather than a welded solution.
So I'm confident in the safety of it: even if the nut fails it won't let the sprocket fall off the splines because the damper plate will keep everything on the shaft.