Owen,
Ok what I want you to do is replace the fuel filter in the tank and also check the fuel lines if they feel tacky and if so replace them as well.
Also did you replace the fuel filter screen in the carby (it is under the cover that has one screew).
We have information on the carby under parts list and manuals area for the correct setup when replacing the diaphragms.
Let me know what happens after you have done that.
