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Can someone explain to me how the air screw works on the mid 90's polaris carb? I have always heard it called an air screw but that didn't make sense because it doesn't adjust the movement of the slide. So I called it a fuel screw and thought screwing it in leaned it out as it cut off the fuel supply coming from the Bowl. And going out richened it by opening the passage. Any help is appreciated.
 

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The air screw is an air inlet for the low idle mix. It will only affect fuel mix below 1000 rpm. The second you lift the throttle slide it ceases to have any affect. rule of thumb : 1 turn out. If it idles rough , you may adjust accordingly. It really has no effect on the operation of engine off idle.
 
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