Series 3 Series 3 mixture problems

Hi, I have a problem with the mixture on my series 3. It has been stood for about 4 weeks while I replaced the blown head gasket and when I have gone to start it after putting everything back together the engine is running very rich and smoking a lot. I have wound the mixture screw fully in and then out 2 1/2 turns as recommended, but still very rich. Winding the mixture screw all the way in doesn't cause the engine to cut out as it should and I have adjusted the mixture screw 1 full turn either way which doesn't make much difference. Which way do I turn the mixture screw to lean the mixture please and does any have any idea what might be wrong?

OK, problem solved, it was human error, I forgot to re-attach the spring on the throttle linkage that attaches to the choke mechanism, running fine now.

Ha, ease to forget something.