LOL, I think I have had a "hext" month with this engine, what I failed on was a deeper understanding of the carburettor, it is the primary air jet which allows the engine fuel to start on, and when it first started earlier in the week, it must have sucked that grass or whatever it was into the jet, and would not start after that. Now I have the engine starting and ticking over reliably, I can find out why the primary choke fuel system is not working, and causing the engine to cut when the throttle is opened. Effectively, it is not a two stage carb, but a three stage one, and only the first stage will start the engine!
Phil