I'm still waiting on the seals to turn up from France before I can do the forks, I found a post that says they take between 190 and 210mm of oil so will use that as a starting point, easy enough to add a bit more if need be.
The clutch was slipping in 4th 5th and 6th.
But with the clutch slip it turns out the pressure plate was sitting at an angle. This was caused by the push rod not being fit to the pressure plate properly, The part the push rod screws into was not slotted into the pressure plate causing it to sit on the wonk. The clutch itself looked perfectly fine with lots of meat on the friction plates.
Since sorting the pressure plate out the clutch now bites hard, it will quite happily pop up the front wheel now where as before it would slip.
The clutch springs were already beyond worn since there was a variety of washers on them so it was a good thing I got some springs for that.
I do realise raising the gearing will have an affect on being able to slow down to a crawl without slipping the clutch but I am willing to give it a test to see how well it copes as it would be nice to have a bit of fun on some local ish byways. It's got alot of torque for a 125 so I think it should fair ok.