Piranha Brother 2 said:
Expensive, but
how often have you/do you need to buy them? We are just very fukken lucky that there are people out there who have put the effort into keeping supplies of parts for these old beasts available. Piet was right, once again!

Gijs was the man.
Happy riding!
Some people go through them like they grow on trees, Quentin!
A mate managed to mash 3 gear sets before I found the speedo was the real culprit. Apparently, a set of internal gears in the instrument drive wear to the point that one gear "rides" up on the other and almost jams the whole plot. This causes just enough friction at the wheel drive to over-stress the gears, but not enough to shear the drive cable.
Anyway, I sent the offending speedo to be repaired, but it was returned in just about the same condition as I had sent it off, only a little prettier. Tell-tale was by turning the drive input with a small screwdriver, after about 3-4 revolutions, the drive would bind. Back it off half a turn, all would be OK for the next 3-4 turns. Unfortunately, the Instrument "expert" wasn't at all co-operative and it took another attempt and a lot of threatening to finally get it operating properly. Needless to say, this guy is not on my Christmas card list...
So, the moral is, if you experience multiple drive failures, chances are, the speedo itself is at fault!
piet