Hi Bigted,
thanks for the reply. Yes I fully disassembled the carby. I removed the emulsifier, but I didn't have a poke thru tool. So I sprayed the cleaner thru it and checked the holes to see if they were clear. Maybe that's not goo enough? Bread tie wire is a good idea and I might try that again if needed.
As to the fully closed section, I can try and place it right at the end of the stop and see if that works. I can also check the linkages as well, but I have to get my head around how they work. A manual would be a good idea to understand it all. I will also check the governor arm isn't slipping, as well as the idle screw.

Thanks for the ideas mate.