How do I adjust a carburetor for a Murray 3.5 hp push mower?

To adjust the carburetor on a Murray 3.5 hp push mower, first, ensure the engine is off and cool. Locate the idle adjustment screw, usually found on the carburetor, and turn it clockwise to increase the idle speed or counterclockwise to decrease it. Start the mower and let it run; fine-tune the screw until the engine runs smoothly at idle without stalling. Additionally, check the air filter and fuel supply for optimal performance.