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hey all!
does anyone know what that "Phillips Screw" adjustment is near the throttle? You can see it from the top. When I turn it or adjust it to the right my K&N is hissling louder, when turning it the other way the sound almost disappears. What is it for? How should I adjust it? Should it be loud or not? p.s. also the RPM increases or decreases.
thanks for info.
 

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Your K&N is hissling because you are adjusting the idle. When you raise it, the motor runs faster, therefore sucking in more air, hence whistling..

But my screw is a flathead... So you might not be messing with the idle... Pretty sure though
 
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