How Do You Adjust the Carburetor on a Weed Eater?

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Weed eaters are available in three different models depending on the type of tasks they’re designed to accomplish. Among these models include the battery powered versions, the electric or corded versions, and finally, the all-powerful gas powered versions.

In this post, we will learn how to adjust the carburetor on a gas powered weed eater to help you save time and money that could otherwise have been spent during a trip to a technician.

Gas powered weed eaters are perfect for accomplishing tough cutting projects, in suburban or mountainous areas. For instance, a weed eater operating in mountainous areas is likely to develop a sputtering or stalling engine due to the high altitudes. Also, if you fail to mix oil and gas in the correct ratios, your weed eater may start vibrating, which may cause the engine to fail.

Now, what’s your first reaction when you discover that your weed eater didn’t start? Well, some people may decide to take it to a repair shop while others may opt to get rid of it and purchase a new unit.

Before doing this, first check the air filters and the spark plugs for any clogged dirt, then check the carburetor, and finally, check the electric connection. If you’re using a gas powered model, use the right tools and follow the correct steps to open up the carburetor to rectify the problem.

What’s a Carburetor?

Two-stroke and four-stroke engines are fitted with a special device known as a carburetor to help mix air and gas for efficient combustion. When gas and air are mixed in the carburetor, a powerful explosion is created and burns in the engine’s cylinder.

When air is sucked into the carburetor, it comes in through a narrow suction pipe known as a venturi. As air enters, a spray nozzle inside the carburetor releases gasoline creating a combustion that produces power.

Now that you understand how a carburetor functions, this section will guide you through a step-by-step procedure on how to adjust this crucial part of your weed eater. Before we continue, let’s first check some of the adjustment tools you’ll require.

  • A flathead screwdriver
  • A special socket opener

Before Adjusting the Carburetor

The first step of troubleshooting the carburetor is to open the air filter to clean any clogged dirt or debris. This step is very easy to accomplish because it involves opening the air filter cover using a flat screwdriver. Next, check if the spark plug is working properly. Use a flat screwdriver to open the boot covering it, then use the available spark plug wrench to remove it.

Finally, if your trimmer has been dormant for quite a long time, the engine might not start due to overstayed or stale fuel. Simply drain the old fuel and replace it with new, “young” fuel for effective performance. If you start the engine and record a negative feedback, then it’s time to adjust the carburetor.

Adjusting the Carburetor

When adjusting the carburetor of your weed eater, you need to locate the two fuel adjustment screws that are highlighted as HI and LO.

The HI screw is usually located on the right side of the trimmer while the LO screw is located on the left. First, try to start the engine. If it doesn’t respond, adjust the LO screw in a counterclockwise turn several times. Next, adjust the HI screw in a full clockwise turn.

After you’ve adjusted the HI and LO screws, you can now try to start the engine to see if it runs at full throttle. If the engine starts, try to listen if it’s sputtering or not. Usually when an engine sputters, that means it’s receiving too much fuel from the carburetor.

To solve this problem, simply adjust the HI screw clockwise in a one-quarter turn until the engine runs smoothly. Likewise, twist the LO screw in a clockwise one-quarter turn to ensure that the engine is idling smoothly.

Now that you’ve followed each of these steps correctly, start your weed eater again and see if the engine runs smoothly. In case your trimmer develops more engine problems, the best action to take is to open up the carburetor to check for any holes or dirt in the valves.

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