Cleaning the Crankcase/Cylinder Barrel mating surfaces was next, however, I tried in vain to remove the Crankcase to Cylinder studs, using repetitions of heat and plenty of KROIL Penetrating Oil left soaking for more time than I would have liked, so decided to carry on cleaning the mating surface until I could get the Studs out.
However, I gave up in the end, time & galvanic corrosion got the better of me and PJ Motorcycle Engineers in Wolverhampton did it in the end, they have far better tools and experience for the job than me.
Initial clean of Crankcase mating surfaces to remove the old Sealant using an old piece of cloth soaked with Brake Cleaner or Meths & yes should have been wearing some gloves.
Just to make sure everything runs smoothly (that will be a first) using M6 & M8 Taps to clean out the Threads in the Crankcase.
A quick dry run with the Crankcase Bolts just to make sure they all screw in freely.

