If it's an EFI engine you do not adjust the mixture screw. The mixture is computer controlled.
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.
Turn the idle mixture screw in to lean the mixture, out to richen the mixture.
If it has a carby there is a sealed mixture screw on the right side looking from the front. Drill out the the plug and the screw is behind it be careful not to damage carb
Try 1.5 turns out on the mixture screw for an initial setting.
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At the base of the carburetor are 2 screws. One adjusts the idle speed and the other adjusts the idle mixture. Screw the idle mixture in until the engine starts missing then screw it out 1 turn. Then, adjust the idle speed screw to about 850 RPM.
On the front side if the carb on the bottom
The air mixture screw does that.
No. Brass is an alloy of copper and zinc.