A wierd one today! Started reassembly of clutch casing etc, so:
Engine: not moved during course of work undertake = fixed. Gearbox, also not moved= fixed.
Front drive sprocket refitted but using SRM nut with seal = fixed.
Primary chain case inner refitted after putting drive chain cover in place, which was positioned using through bolts for sliding plate location.
Lower bolt at rear of chain case fitted, and top bolt through PC into drive chain case, perfectly aligned, but not fitted yet.
All ok, and as removed. And yes, I realise I should have put footrest in position before I fitted the PC inner!!
The problem I found was that the back of the clutch drive hub with the taper and key fouled the drive sprocket case, and I can't see why. It's not fouling by much, and it's as though the primary chain is too long, causing the drive sprocket to be too far back, as the drive chain case hole isn't central about the gearbox shaft.
I've sorted it, but it bugs me that I've not sussed WHY
Ps should the new felt seals be soaked in oil or fitted dry prior to assembly?