Re: Idle Screw Adjustment
Indeed it's a sign that something else (cable adjustment, air leak) is not correct.
Adjust the cable so there is just a tiny amount of slack in the sleeve (you know it's too tight when turning the bars changes idle speed, too loose when the twist throttle doesn't return (it'll be funky too tight as well) ).
Assure you have no intake leaks....use water or WD-40 or propane gas cautiously around the fittings, see if idle changes....
And bare in mind, idle can be funky until well broken in. It will change a lot as engine warms up.