If you’re like most homeowners, you rely on your Husqvarna trimmer to keep your lawn looking its best. But what happens when your trimmer starts running rough or won’t start at all? One of the most common problems with trimmers is a dirty or clogged carburetor. A dirty carburetor can restrict the flow of fuel to the engine, causing it to run poorly or not at all. In this article, we’ll show you how to rebuild your Husqvarna trimmer carburetor so you can get your trimmer up and running again in no time.
Before you start, you’ll need to gather a few tools and supplies. You’ll need a carburetor rebuild kit, which you can purchase from your local hardware store or online. You’ll also need a few basic tools, such as a screwdriver, wrench, and pliers. Once you have your tools and supplies, you can follow these steps to rebuild your carburetor:
1. Remove the carburetor from the trimmer. To do this, you’ll need to disconnect the fuel line and throttle linkage. Once the carburetor is disconnected, you can remove it from the trimmer by unscrewing the mounting bolts.
2. Disassemble the carburetor. Once the carburetor is removed from the trimmer, you can disassemble it by removing the screws that hold it together. Be careful not to lose any of the small parts, such as the gaskets and springs.
3. Clean the carburetor parts. Once the carburetor is disassembled, you can clean the parts with carburetor cleaner. Be sure to clean all of the passages and jets in the carburetor.
4. Reassemble the carburetor. Once the carburetor parts are clean, you can reassemble the carburetor. Be sure to use new gaskets and O-rings when you reassemble the carburetor.
5. Install the carburetor on the trimmer. Once the carburetor is reassembled, you can install it on the trimmer. Be sure to connect the fuel line and throttle linkage before you start the trimmer.
Adjusting the High-Speed Needle
The high-speed needle controls the fuel flow at high speeds. It is typically located at the top of the carburetor. To adjust it, start by turning the needle in all the way. Then, back it out 1.5 to 2 turns. This should be a good starting point for most engines.
If the engine is not running smoothly at high speeds, you may need to adjust the high-speed needle further. To do this, run the engine at high speed and adjust the needle in small increments until the engine runs smoothly. If the engine starts to bog down or hesitate, you have gone too far and need to back the needle out a bit.
Here is a table summarizing the steps for adjusting the high-speed needle:
| Step | Action |
|---|---|
| 1 | Turn the needle in all the way. |
| 2 | Back the needle out 1.5 to 2 turns. |
| 3 | Run the engine at high speed and adjust the needle in small increments until the engine runs smoothly. |
Adjusting the Low-Speed Needle
The low-speed needle controls the fuel-air mixture at low engine speeds (idle to 1/4 throttle). To adjust it, follow these steps:
1. Warm up the engine until it reaches operating temperature
2. Turn the low-speed needle clockwise to lean out the mixture until the engine begins to run roughly
3. Turn the low-speed needle counterclockwise to richen the mixture until the engine runs smoothly again
4. Reset the low-speed needle 1/8 to 1/4 turn clockwise from the point where it was running smoothly
5. Repeat steps 1-4 if necessary to fine-tune the adjustment
6. Test the engine at low speeds and make sure it idles smoothly and responds well to throttle changes
7. Advanced Troubleshooting
If the engine continues to run poorly at low speeds after following the above steps, the following table provides some additional troubleshooting tips:
| Symptom | Possible Cause | Solution |
|---|---|---|
| Engine idles too high | Low-speed needle too lean | Turn the low-speed needle counterclockwise to richen the mixture |
| Engine idles too low | Low-speed needle too rich | Turn the low-speed needle clockwise to lean out the mixture |
| Engine stalls when throttle is applied | Low-speed needle too lean | Turn the low-speed needle counterclockwise to richen the mixture |
| Engine surges or hesitates when throttle is applied | Low-speed needle too rich | Turn the low-speed needle clockwise to lean out the mixture |
Reattaching the Carburetor
Once you have cleaned and inspected the carburetor, it is time to reattach it to your Husqvarna trimmer. To do this, follow these steps:
- Fit the carburetor back into the engine housing, aligning the mounting holes.
- Secure the carburetor with the bolts you removed earlier, tightening them evenly.
- Reattach the fuel line to the carburetor.
- Connect the throttle linkage to the carburetor.
- Inspect the air filter and replace it if necessary.
- Reinstall the air filter housing.
- Connect the spark plug boot.
- Start the trimmer and check for proper operation. Adjust the carburetor settings as necessary.
Detailed Instructions for Adjusting the Carburetor Settings
To fine-tune the carburetor settings after reattaching it, follow these detailed instructions:
- Start the trimmer and let it run for a few minutes to warm up.
- Turn the idle screw counterclockwise until the trimmer idles smoothly.
- Then, turn the high-speed screw clockwise until the trimmer reaches its maximum speed without bogging down.
- Finally, adjust the low-speed screw until the trimmer accelerates smoothly from idle to full throttle.
| Setting | Adjustment | Effect |
|---|---|---|
| Idle Screw | Turn counterclockwise | Increases idle speed |
| High-Speed Screw | Turn clockwise | Increases maximum speed |
| Low-Speed Screw | Turn clockwise | Increases acceleration from idle |
How To Rebuild Husqvarna Trimmer Carburetor
A carburetor is an essential part of a small engine, and it is responsible for mixing fuel and air in the correct proportions. If the carburetor is not properly adjusted, it can cause the engine to run poorly or even stall. Rebuilding a carburetor is a relatively simple process, and it can be done with a few basic tools.
To begin, you will need to remove the carburetor from the engine. This is usually done by removing a few bolts or screws. Once the carburetor is removed, you will need to disassemble it. This can be done by removing the screws that hold the carburetor body together. Once the carburetor is disassembled, you will need to clean all of the parts with carburetor cleaner. Be sure to pay special attention to the jets and passages, as these are the areas where fuel and air mix.
Once the carburetor is clean, you can begin reassembling it. Start by installing the jets and passages. Be sure to tighten the screws securely, but do not overtighten them. Once the jets and passages are installed, you can install the carburetor body. Again, be sure to tighten the screws securely. Once the carburetor body is installed, you can install the other components, such as the throttle linkage and the fuel line.
Once the carburetor is reassembled, you can reinstall it on the engine. Be sure to connect the fuel line and the throttle linkage. Once the carburetor is installed, you can start the engine and adjust the carburetor as necessary.
Rebuilding a carburetor is a relatively simple process, but it is important to follow the instructions carefully. If you are not comfortable working on small engines, it is best to have a qualified mechanic rebuild the carburetor for you.
People Also Ask
How do I know if my Husqvarna trimmer carburetor needs to be rebuilt?
There are a few signs that your Husqvarna trimmer carburetor may need to be rebuilt. These include:
- The engine is difficult to start.
- The engine idles poorly.
- The engine stalls when you try to accelerate.
- The engine runs rough.
- The engine smokes excessively.
How often should I rebuild my Husqvarna trimmer carburetor?
The frequency with which you need to rebuild your Husqvarna trimmer carburetor will depend on how often you use it and the conditions in which you use it. If you use your trimmer frequently in dusty or dirty conditions, you may need to rebuild the carburetor more often. In general, it is a good idea to rebuild the carburetor every few years.
Can I rebuild my Husqvarna trimmer carburetor myself?
Yes, you can rebuild your Husqvarna trimmer carburetor yourself. However, it is important to follow the instructions carefully and to use the correct tools. If you are not comfortable working on small engines, it is best to have a qualified mechanic rebuild the carburetor for you.
