She lives again!!!
Just an update on my current situation which will hopefully be of some use to you...
I bought a new needle jet, jet needle and main jet sealing washer today and installed them on my carburettor. Kicked the motor over for ten minutes to no avail. I also bought a new ignition coild and after swapping the old coil with the new one, the old girl started to life on the first kick. Rode it up the street with stock carbie settings and it didn't hesitate in the slightest throughout the throttle range.
Just a note, I too had a smokey machine and replaced both crank seals which eliminated the excessive smoke but didn't fix the running problems. However, excessive oil will have the same effect as a weak spark as it will be harder to ignite and will foul plugs quicker. As Nigel said, the spark should be a clean blue one that jumps between the gap cleanly. If all else electrical checks out (ie, stator coil resistances and spark advance) then your coil may prove to be the culprit.
Best of luck goodwoodweirdo! I hope you manage to sort it out (it'll be worth it when you do).
Good luck, John.
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