JD needles are JD needles. Google JD jetting kits and you'll find them. They cost $$$.
The revs changing with the bars means somethings not right with the cable. Its either routed icorrebclty or binding on something.
The idle screw sets the slide height and then the cable clips into the slide and lifts the slide when you turn the throttle. If its binding or too short, then turning the bars will still pull the cable, raise the slide and make the engine race. It sounds like you've worked out the free slack so now you need to use the idle screw to lift the slide to get an idle.
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