L.A.B. said:
There's some useful advice given in the NOC Service Notes:
"Sleeve gear bushes are always coming loose-sometimes the outer bush moves inwards to the centre of
the sleeve gear-then all you need do is to Loctite a new bush in the end. Leave the old one in and it will
prevent the new one moving inwards, i.e. fit three bushes in your 750 a la 850. Sometimes the bush
moves outwards and gradually mills itself away on the sharp edges of the circlip which locates the clutch.
That’s worse because eventually the bush disappears completely and all the pull of the back chain comes
on the sleeve gear bearing. No wonder the bearings come loose. Often the first sign of sleeve gear
bushes going -is striking "gold" in gearbox or primary drive oil, watch it! Here the answer is to buy two
new bushes and a clutch location shim (060894 or 060895). Push both bushes-Loctited on the outside--
into the sleeve gear--the middle one stops the outer from moving in-and then put the shim loose on the
shaft to avoid the bush wearing on the circlip even if it does move. It is an advantage to grind the outer
edge of the shim so it will pass through the hole in the primary case (or file or even clip it away with tinsnips
to about half the radial thickness)."
