1. Locate the carburetor. The carburetor is usually located on the side of the engine, near the air filter. It is a small, metal device with several screws and a fuel line attached to it.
2. Remove the air filter cover. This will expose the carburetor.
3. Look for the mixture adjustment screws. There are two mixture adjustment screws on the carburetor: a low-speed screw and a high-speed screw. The low-speed screw is usually located on the bottom of the carburetor, while the high-speed screw is usually located on the top.
4. Adjust the low-speed screw. Turn the low-speed screw clockwise until it is lightly seated. Then, turn it counterclockwise 1.5 turns.
5. Adjust the high-speed screw. Turn the high-speed screw clockwise until it is lightly seated. Then, turn it counterclockwise 2.5 turns.
6. Start the engine and let it warm up. Run the engine at idle for a few minutes to allow it to warm up.
7. Adjust the idle speed. The idle speed is adjusted by turning the idle speed screw. Turn the idle speed screw clockwise to increase the idle speed, or counterclockwise to decrease the idle speed.
8. Test the carburetor adjustments. Once you have made the carburetor adjustments, test the engine by running it at different speeds. The engine should run smoothly at all speeds.
8. Replace the air filter cover and put the weed eater back together.
Here are some additional tips for adjusting a Ryobi weed eater carburetor:
* If the engine is running too rich (too much fuel), turn the mixture screws clockwise to lean out the mixture.
* If the engine is running too lean (too little fuel), turn the mixture screws counterclockwise to richen the mixture.
* If the engine is idling too fast, turn the idle speed screw counterclockwise to decrease the idle speed.
* If the engine is idling too slow, turn the idle speed screw clockwise to increase the idle speed.
* If the engine is surging (running at a high idle speed, then slowing down, then speeding up again), turn the mixture screws counterclockwise to richen the mixture.
