Dear HR;
There are 2 (or more) screws used in the idle adjustment. :rolleyes:
The speed adjustment screw (moves throtle plate)and the air/fuel screw(s) (change mixture).
It doesn't matter who makes the Carb. as It's the same for ALL.
First make a rough speed adjustment. Then; turn a mixture screw in till it 'misfires' (to lean) then back out 3/4 of a turn.
That's all folks.
PS: Jets, rods, springs & other parts are NOT involved with/in the idle circuit.
