I spent a few hours investigating the issue today. Drained the oil, took the clutch casing and clutch drum off and also the sump.
I noticed that the bolt circled in red had become loose enough to allow the disc to have some play. I think this then meant that the shift arm in blue wasn't snug up to the pins. It was catching them and then slipping off. Because the bolt was loose I think it also meant that the part behind the disc wasn't straight like it should have been.
I took the disc off and put the bolt back so I could see what was happening and when I held the arm in place it shifted fine. I added the disc back and tested it again and it felt like it was slipping off the pins again. The arm had some stiffness against the disc when it tried to return flush against the pins. This turned out to be because the gear shift shaft had moved out slightly and was putting some pressure on the arm, I pushed the shaft back and it seems to be fine.
What actually holds the gear shift shaft in place? Is it just the gear shifter? Does anything hold it in place on the clutch side?
One other thing to double check. Does the arm held in place by the yellow bolt help shift it that last little bit? When I removed the arm when testing and I would shift I would need to manually rotate the part behind the disc slightly to get it to engage the gears. This gave me a little panic because I was hearing sounds from the gear box I thought that something had become loose inside.
Lastly does anyone know the toque settings for the red and yellow bolts and also the bolts that hold the clutch springs in place? I will also be putting a bit off loctite on them.
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