Thanks guys. The choke mechanism has been apart and works smoothly, and except when the engine is at its coldest, works fine. As in, when engines warm, needs no choke. A bit cold, half choke. Colder, full choke does the business. Only when it is really cold, full choke, engine fires for a few revs but dies immeadiately and will not restart.
In those conditions, a fan heater directed under the tank, towards the carb, maybe reaching the air intake under the seat, for just a minute and it will fire up and run without choke.
The local bike shop suggests dodgy coil/HTlead & condensation. Their theory being that the fan heater blows the condensation away. I am sceptical, but as they can supply new coil & lead for £21 I'll give that a try. As a 19 year old bike, with winter coming on its probably a good idea anyway.
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