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Could someone explain how the idle adjust screw (not the PMS screw) work on the vstar 650? Does this change the idle air/fuel mixture? I haven't been able to find a good explanation on how this works exactly so far.

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All it does is adjust the throttle stop point. It's basically a screw with a knob on the end. Turn to the right to increase the ideal and turn to the left to decrease the throttle. It does not change the fuel/air mixture.
 
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