Blog posts these days seem to veer between a little part manufacturing, perhaps on the lathe, to reporting on something else that I found broken. This post is one of those.
Pulling off the primary drive and clutch to gain access to the area behind the engine where the footrest spacer lives revealed a couple of problems with the gearbox. There is a little plate with three holes which ties the gearbox to one of the frame studs - there are two 5/16 BSW studs in the gearbox, with CEI threads outboard holding this plate to the gearbox .
Or there should be:
In this picture you can see the 5/16 BSW hole for the top stud, but it looks like the bottom stud is broken. We would have to get the gearbox out to have a look at that properly and remove it, but after a clean and a poke around it looks like the stud was lost years ago and the hole was just full of gunge. They clean up good as new with a 5/16" BSW tap:
While we are at it, we can bend this bracket back into shape - it retains the primary chain adjustment bolt which moves the gearbox forwards and backwards to tension the chain. Guess what? Can you see a broken bolt in that hole? I do have a new chain adjustment bolt because I thought it was missing but now I can see the remains on the old bolt stuck in the gearbox housing...
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