What is the adjustment for fuel and air mixture screw on a 1986 mariner 9.9 outboard?
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On the left side of the carb there are two screws, a recessed brass screw with slotted head (mixture adjustment screw) & a silver-colored screw with a Phillips head (idle adjustment screw). To properly tune the carb (assuming the carburetor body, jets, and bowl are clean & there are no air leaks) turn the idle screw (silver) clockwise to raise the idle...raise the idle quite a bit. Then, with the engine idling fast, turn the mixture adjustment screw (brass) in several turns (keep a count) and out several turns (again, it helps to keep track of how many turns) and listen for the moment when the engine runs the fastest. Now, with the mixture adjustment screw (brass) near the spot where the engine runs the fastest, turn it 1/2 turn either direction and listen for the spot where the engine seems to run the best, set your mixture adjustment screw (brass) to that spot. Then drop your idle back to normal by turning the idle screw (silver) counter-clockwise. Your carb is now tuned (simple...raise the idle, adjust the mixture for fastest/smoothest rpm, then lower your idle...done).
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Set idle speed to proper r.p.m, by adjusting the IDLE SPEED SCREW. Turn the IDLE MIXTURE SCREW or the AIR SCREW to for correct procedure, achieve highest speed and best response. The IDLE MIXTURE SCREW (FCR) controls fuel delivery to the idle port and the SCREW is located on the engine side of the carburetor slide. Turning the IDLE MIXTURE SCREW out will make idle and off-idle richer. Turning IDLE MIXTURE SCREW (CR, PWK, PJ, PE) controls the amount of air to the IDLE and SLOW CIRCUIT. This SCREW is located on the air cleaner side of the throttle slide and turning the SCREW out will lean the mixture and turning the SCREW in (clockwise) will richen the mixture.