I sometimes have a similar thing, for various reasons and doing it again lately. I have an adjuster on the handlebar lever, and find that if it's not 'locked' in the 'notch' it vibrates loose. Last week it didn't do the trick so addressed it differently and found the pushrod adjuster was loose, but I think it was because I'd been fiddling with it and forgot to tighten it properly. It won't in your case be, but I also found a flat-spot on its ball, and trying to determine if it may be ok if the flat-spot stays engaged with the rod end
.
Otherwise, I've had a bit of an ongoing issue with one of the pressure springs undoing. It was all OK when I checked in conjunction with above, but the little tabs on the spring adjuster nuts that engage with the spring ends to stop undoing (I guess that's the intent) are worn away, but previously was I think due to using five friction plates (as per parts list), but the springs don't engage enough, so I dropped one of each out and it's much better(six spring Plunger model, new plates).
I think I asked a while ago about clutch springs, as I bought new ones from DragAnFly, and received right-hand wound ones(even though I specified L/H
), and all the others I have are left-hand wound, so wonder if they are in fact any different in service. I haven't used them yet.
Can't think of any other possibilities for you at this stage......