Hi Roebuck, only just come inside after pulling the carb down again. I didn't get a chance to try that but I did clean the foam element and reoiled it when I first bought the machine.
What I did find this time was the emulsion tube was quite dirty. This is a machine that has sat for a while with virtually no use. Its not a screw in type so I had to remove the choke butterfly to gently tap it out. It's internal diameter was very dirty and required a bit of soaking to get it clean.
The rest of the carby is quite clean. Im guessing the previous owner was into the carb as there are tell tale signs on the screw heads.
How it runs - it has a 5 position choke, previously it would start on full choke and run in the second position and stall on the third position.
Now it starts easily on full choke and runs in the third position, hunts quite bad in the forth position and stalls in the fifth position.
When you remove the float bowl screw you look up into the bottom of the emulsion tube. Next to the emulsion tube is another hole which seems to go about three quarters of the distance parallel to the emulsion tube and then stops. Where does this vent to? Perhaps this too is clogged?
I will try and get a carb number