. OK, you probably WILL need to pull the tank. Not sure I understand your question though. Do you need to separate the carb slide (the round cylinder hooked to the throttle cable) from the cable, or do you need to disconnect the accelerator pump from IT'S cable? Or both?? If it's the slide, you just collapse the spring enough to unhook the cable from the inside of the slide, then slide the cable through the slot in the slide. Then you can access the needle and clip after removing the retaining clip that was under the spring. Less complicated then it sounds. Lemme know how it turns out.
Also, the fuel screw is under the carb in the front (engine side) and is really only accesible if you remove the carb. Anything that looks like a screw INSIDE the carb is a jet, not the fuel screw. The fuel screw is OUTSIDE the carb.