Thanks again! There's definitely no return to the exterior lever, so probably not the shift plate.
I have a torque wrench and all the tools except the clutch tool, I think I can get away with this on my own.
Is the clutch tool needed for disassembly? Or only reassembly?
Much more satisfying to do the job yourself if you're able, and with the money you save you can treat the bike to some more goodies
It definitely sounds like a snapped pin on the gear change shaft but I'd hold off ordering the parts until you take a look, it could be a snapped return spring which would be a lot cheaper, timewise it makes no difference ordering the parts before or after. Also once you take a look you may find other parts you want a change as a precaution while you have it apart, such as the shift plate and there's a little tiny spring on the detent wheel I wish I changed when I did mine, not because it has snapped but because it just looks so small and flimsy.
Also it's a good opportunity to measure the clutch plates, mine were thankfully only 20% worn after 22000 miles as a new clutch pack for a 675R isn't cheap.
In theory you should use a clutch tool for disassembly and reassembly but like I said I've managed mine twice without any, it's definitely easier with a second person and a long breaker bar, with spoked wheels you don't have the option of throwing a bar through the swingarm to lock the wheel, unless you want a bent spoke.
I was going to order this type of tool for the future as some of those universal tong type tools look a bit flimsy, and you'd have to be certain the one you buy fits your clutch, I don't know if anyone in the US is doing something similar to this?
The centre nut is detented onto the shaft to lock it in place, so make sure you you free it with a small punch before you attempt to loosen. I think that's the only reason they tell you to use a new nut, if you can get a copy of the service manual it would be helpful to go along with any videos.