whats the deal with the screw at the bottom of the idle adjustment knob? when i turn the knob nothing happens? i wanted to turn the screw and nothing happened as well? and someone said something about if you turn the knob too much it will come out of place from where its connected under the tank? please help me with this problem or if you know why my bike ran fine yesterday and stalled on me today? i tried everything but the only thing i can really think of is my idle adjuster because nothing happens when i turn it? also this might help the bike will start/run but i have to give it gas when i let off the throttle it stalls????