How to Adjust Weed Wacker Carbs

A weed wacker is used to trim tall grass and weeds, and for edging.

A weed wacker is a simple two stroke engine mounted onto a metal shaft. At the end of the shaft is a rotating head with blades or plastic tines that cut away at the grass. The engine has a small carburetor that controls the speeds of the running engine. If the carburetor is not adjusted properly the engine will run too quickly, reducing fuel efficiency, or will cut out when idling. Adjust the carburetor regularly for the best functionality.

Things You'll Need

• Screwdriver

Instructions

1. Locate the carburetor. It's usually near the fuel tank.

2. Locate the carburetor's high, low and idle speed screws. These are usually marked with an "H," "L" and "LA," respectively.

3. Tighten the screws by turning them clockwise using a Phillip's head screwdriver until they're completely tight.

4. Turn the screws counter-clockwise one and a half turns and start the engine. The engine will run rough. Press the throttle handle to keep the engine from shutting down.

5. Turn the "L" screw slowly until the engine starts to run smoothly without dying out.

6. Press the throttle and hold it. Adjust the "H" screw clockwise until the engine runs with the throttle open, but not shut down.

References

• Stihl USA: Stihl FS 310
• Weed Eater: Owner's Manual

Resources

• Read this Article in Spanish