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Can the carburetor on a Briggs and stratton 4.5 hp lawn mower be adjusted?

Yes, some adjustment is possible for fuel and idling speed in the carburetor on a Briggs and Stratton 4.5 hp lawn mower. Here's a general guide on how you can adjust the carburetor:

Safety First: Before making any adjustments, make sure the lawn mower is turned off and disconnected from its power source.

Fuel Mixture Adjustment:

1. Locate the carburetor on your lawn mower. It's usually near the air filter and intake manifold.

2. Look for a screw labeled as "Idle/Fuel Mixture" or "Fuel Adjustment." This is the screw that controls the fuel mixture.

3. Turn the fuel mixture adjustment screw clockwise to lean out the fuel mixture (reduce fuel flow) or counterclockwise to richen the fuel mixture (increase fuel flow).

4. Make small adjustments at a time. Each turn of the screw changes the fuel mixture significantly.

Idling Speed Adjustment:

1. Find the screw labeled as "Idle Speed" or similar on the carburetor.

2. Turn the idle speed screw clockwise to increase the idling speed or counterclockwise to decrease it.

3. Set the idling speed to a level where the engine runs smoothly and consistently without stalling.

When adjusting the carburetor, keep in mind that small adjustments can have a big impact on engine performance. It's best to start with small increments and test how the engine responds before making further changes.

If you're still experiencing issues with your lawn mower engine after adjusting the carburetor, it's recommended to consult a professional lawn mower repair service for further assistance.