Managed to source a "fair condition" complete gearbox from E bay which arrived on Saturday.

It does indeed appear to be in fair condition, the gears that really needed re bushing in mine are much better than mine were. Just a little movement but not enough in my opinion to warrant re bushing.

The "fair condition" one had a knackered output shaft bearing so I pulled the good one off mine and fitted it to the new shaft.

I pulled everything apart - took every gear, shim and circlip off the shafts to check that everything was assembled correctly, and that nothing was too badly worn. As far as I could ascertain everything is in good order.

I have just ordered new circlips for the gearbox shafts, the guidance from Mother Kawasaki is never to re use the circlips on the gearbox shafts.

Only downside is that the bearing on the gearbox "input shaft" is a sliding fit on the gearbox shaft, on the old one it was just discernably loose, I plan to re assemble it using Loctite 620 (high strength / high temp) which should hold things together.

Temporarily put it all back together this afternoon just to check that all gears select, and they do.

At the end of the day my old gearbox cluster will be "retired" and probably find it's way onto E Bay once the bike is back up and running.