Being on clip 1 shows that something isn't right. I recommend two things. First check your needle jet, they get worn over time and are not replaceable.
If that is OK, get the carb cleaned in an ultrasonic cleaner.
If you get no reaction on the air screw try following:
-warm up engine
-set air screw to 1.5 turns
-turn in idle screw until engine rpm raises and it is running faster than usual
-open/close air screw in small steps and see where it idles fastest
-once it idles fastest let the air screw as it is and turn idle down with idle screw
That way you determine if the pilot jet size is OK. If the air screw is open more than 2.75 turns reduce jet size one step, if air screw is less than 1 turn out use next bigger pilot jet.
edit: just seen that a test carb is on its way to you. Try that one first...
Good luck!
Doc
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