That will be No61. Which will have little effect on the puddle of oil under your bike. The only way to stop that is to fit a sealed bearing 57 inside the box. Ron
Part is 24-4232 where does this go? Its not arrived yet so unsure on the diameter until its in my hand so does it go under the sprocket or on the other side where the locking nut is? Also part 57 on the diagram has come as a sealed bearing so that should help
It's not obvious from the drawing Tod, but it goes over the mainshaft and sits against the nose of the sleeve gear. The sleeve gear should have a taper in the bronze bush to accept it.
As Ron mentions it won't stop the drips.
A double sealed ball race bearing is the best bet to reduce the drips.
I shall be servicing my gearbox and engine over the winter and was wondering whether wear in the mainshaft sleeve gear bush could contribute to the gearbox oil loss?
Yes! A sealed bearing will stop oil leaking through the bearing but the oil can also leak between the main shaft and a worn sleeve gear bush, apart from other detrimental effects of a worn bush to the running of the gearbox. Ron
Yes they probably will need reaming. The original bush was one long bush #54. The new bushes are usually two shorter ones, entered from each end with a gap in the middle. PM me if you want me to email the gearbox service sheets. Ron