I was out tstripping and tinkering the engine last night and finished this morning. I never put the gasket on. But another kickstart shaft and lever.
The kickstart shaft had been rubbing hard on the top clutch (AF). This has been sorted and I don't know if it's me, but it seems easier to kick over.
I measured the gap betwen the kickstart and the sde casing and I'll keep a very close eye on that.