This was about as far as I got in 2005.
Major problems identified, fuel tank rotted out, tin work around rotors almost non existent, engine side covers rusted through in places and hinges broken. Handle bar adjustment to swing left or right seized solid and something certainly not right with big end of engine as it would only rotate so far. Magneto would need a full rebuild and radiator was an unknown regarding leaks. I took the radiator away to have it tested and was very pleased to find it was OK.
After much heating, soaking with penetrating oil, gentle taps with soft hammer the handle bar adjuster sleeve was still firmly stuck. I decided a bit more persuasion was needed so using a flat ended bit in the SDS drill set to hammer only I attacked the sleeve. Holding the drill against one end of the sleeve a gentle plume of smoke like rust emerged from the other end, something was happening! Further application of the drill to both ends alternating between them and eventually there was movement, success.
The next job was to tackle the engine and clutch. It was now January 2006.