YZ426 carburetor question

how do I adjust the screw with the spring above the accelerator pump rod just below the throttle cable connections at the carb. I am not sure what is does and my manual if very vague..:thumbsup:

Do you mean the one which is directed to the other side of the carb and has a black knob? That's the idle adjust (it raises/lowers the throttle valve).

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