Usually the numbers on the slide denote the throttle cutaway. I have personally never tried swapping them, so I have no insight on the changes it would make. That carb is a copy of a mikuni vm. I don't believe the float level is adjustable on the smaller ones. The float and adjustment tang are one piece and plastic. There is a free vm tuning manual floating around online. Just google mikuni vm tuning. It is specific to your carb type.
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