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The idle screw on a 1981 40 hp Mercury outboard engine is typically located on the carburetor, near the throttle linkage. It is usually a brass screw that adjusts the idle speed of the engine. To locate it, follow the throttle cable to the carburetor, and look for the screw that can be turned to increase or decrease the idle RPM. Always consult the owner's manual for specific details and adjustments.

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