Grumpy, when the choke is applied the hunting ceases completely.
I need to try the test you indicated below by removing the float bowl. I only completed the test with the hose removed from the carby and that didnt identify any problems with fuel flow. I will also give the fuel filter another clean.
I have ordered some fresh carby intake gaskets however the current ones seem to be in really good condition. Bruce suggested I replace them anyhow.
I checked the float needle and it doesnt seem to have worn away of have been damaged.