Is Your Husqvarna Lawn Mower Running Rough? Here’s How to Clean the Carburetor!

Are you tired of your Husqvarna lawn mower sputtering, stalling, or refusing to start? These frustrating symptoms often point to a dirty carburetor. This vital engine component, responsible for mixing fuel and air, can become clogged with debris, varnish, and other residues over time. This article will guide you through the process of cleaning your Husqvarna lawn mower carburetor, restoring it to peak performance and saving you a trip to the mechanic.

Why You Need to Clean Your Carburetor

A dirty carburetor can hinder your lawn mower’s performance in several ways:

  • Reduced Power: A clogged carburetor restricts the fuel flow, leading to a decrease in engine power and difficulty in mowing thicker grass.
  • Difficult Starting: A dirty carburetor can make it challenging to start the engine, as the fuel-air mixture becomes unbalanced.
  • Engine Stalling: A clogged carburetor can cause the engine to stall, particularly when idling or under load.
  • Increased Fuel Consumption: An inefficient carburetor burns more fuel, costing you more money and impacting the environment.

Preparing for the Cleaning Process

Before you begin, ensure you have the following tools and supplies:

  • A clean workspace: This will help avoid contaminating the carburetor during the cleaning process.
  • A carburetor cleaning kit: This typically includes a carburetor cleaner, brushes, and a small container for soaking.
  • A flat-head screwdriver: For removing screws and carburetor components.
  • A Phillips head screwdriver: For removing screws and carburetor components.
  • Gloves: To protect your hands from harsh chemicals.
  • Safety glasses: To protect your eyes from debris and cleaning chemicals.
  • A rag: For cleaning and wiping up spills.
  • A fuel filter: This helps prevent debris from entering the carburetor again.

Step-by-Step Guide to Cleaning Your Husqvarna Lawn Mower Carburetor

1. Disconnect the Fuel Line:

  • Locate the fuel line: This flexible hose connects the fuel tank to the carburetor.
  • Remove the fuel line clamp: This clamp secures the fuel line to the carburetor.
  • Gently pull the fuel line off the carburetor: Avoid bending or damaging the fuel line.
  • Place a rag under the carburetor: This will catch any spilled fuel.

2. Remove the Carburetor:

  • Locate the carburetor: The carburetor is typically situated on the side of the engine, near the air filter.
  • Identify the screws holding the carburetor in place: These may be flat-head or Phillips head screws.
  • Use a screwdriver to loosen and remove the screws: Be careful not to strip the screw heads.
  • Gently lift the carburetor off the engine: Avoid pulling on any hoses or wiring.

3. Disassemble the Carburetor:

  • Locate the carburetor float bowl: This is the lower part of the carburetor that contains the fuel.
  • Remove the screws securing the float bowl: Be sure to remember the order of the screws and any washers.
  • Carefully lift the float bowl off the carburetor: Avoid damaging the float or its needle.
  • Remove the jet and other internal parts: Use a flat-head screwdriver or a small pick to remove the jet, main nozzle, and other components.

4. Clean the Carburetor Parts:

  • Soak the carburetor parts in carburetor cleaner: Follow the instructions on the cleaner’s bottle.
  • Use brushes to scrub away debris: Focus on cleaning the jet, main nozzle, and other small passages.
  • Rinse the parts with clean water: Be sure to remove all traces of carburetor cleaner.
  • Allow the parts to dry completely: This will prevent rust formation.

5. Reassemble the Carburetor:

  • Reinstall the jet, main nozzle, and other internal parts: Ensure they are seated properly.
  • Reattach the float bowl: Be sure to tighten the screws securely but avoid overtightening.
  • Reconnect the fuel line: Make sure the fuel line clamp is securely tightened.

6. Reinstall the Carburetor:

  • Place the carburetor back on the engine: Align the mounting holes.
  • Tighten the screws holding the carburetor in place: Do not overtighten.

7. Replace the Fuel Filter:

  • Locate the fuel filter: It’s usually found near the fuel tank or carburetor.
  • Remove the old fuel filter: Be careful not to spill any fuel.
  • Install the new fuel filter: Ensure it’s properly secured.

8. Start the Engine and Test:

  • Turn the fuel valve on: This allows fuel to flow to the carburetor.
  • Start the engine: If you’re having difficulty starting, try priming the carburetor with some fuel.
  • Check for leaks: Inspect the fuel line and carburetor connections for any leaks.
  • Test the engine’s performance: Run the engine for a few minutes and observe its performance.

Troubleshooting Common Problems:

If your engine still isn’t running smoothly after cleaning the carburetor, consider these potential problems:

  • Clogged Fuel Line: If the fuel line is restricted, it can prevent sufficient fuel flow to the carburetor. Consider replacing the fuel line.
  • Faulty Spark Plug: A damaged spark plug can prevent the engine from igniting the fuel-air mixture. Inspect the spark plug and replace it if necessary.
  • Dirty Air Filter: A dirty air filter can restrict airflow, disrupting the fuel-air mixture. Clean or replace the air filter.

Tips for Maintaining Your Carburetor

  • Use high-quality fuel: Avoid using fuel that’s older than 30 days, as it can contain harmful deposits.
  • Run the engine until the fuel tank is empty: This helps prevent fuel from sitting in the tank for too long, reducing the risk of deposits forming.
  • Clean the carburetor annually: Regular cleaning can help prevent buildup and maintain optimal performance.


By following these steps, you can confidently clean your Husqvarna lawn mower carburetor, restoring its power and efficiency. Remember to wear safety gear and use caution when handling cleaning chemicals. Regularly cleaning and maintaining your carburetor will ensure your lawn mower performs its best season after season, leaving your yard looking pristine and your mowing experience enjoyable.

Frequently Asked Questions

1. Why is my Husqvarna lawn mower running rough?

A rough-running Husqvarna lawn mower is often a sign of a dirty carburetor. The carburetor mixes fuel and air, and over time, dirt and debris can clog the tiny jets and passages within it. This results in an inconsistent fuel-to-air mixture, leading to symptoms like sputtering, stalling, or difficulty starting.

If your mower exhibits any of these symptoms, a thorough carburetor cleaning is usually the first step in troubleshooting. This process involves disassembling the carburetor, cleaning all its parts, and reassembling it properly. A clean carburetor ensures optimal fuel delivery and smooth operation.

2. What are the signs of a dirty carburetor?

There are several telltale signs that indicate a dirty carburetor on your Husqvarna lawn mower. These include difficulty starting, stalling, sputtering, inconsistent engine speed, and a loss of power. You might also notice black smoke coming from the exhaust or a fuel smell.

The presence of these symptoms suggests that the fuel-air mixture is compromised due to a clogged carburetor. Cleaning the carburetor is crucial to restore smooth engine operation and prevent further damage.

3. How often should I clean my Husqvarna lawn mower carburetor?

While there’s no set schedule, it’s generally recommended to clean your Husqvarna lawn mower carburetor every 12-24 months. The frequency depends on various factors, such as the age of the mower, the type of fuel used, and the storage conditions.

However, if you notice any of the symptoms mentioned above, it’s time to clean your carburetor regardless of the last cleaning date. Regularly cleaning your carburetor ensures optimal performance and extends the lifespan of your lawn mower.

4. What tools and supplies do I need to clean my Husqvarna lawn mower carburetor?

To clean your Husqvarna lawn mower carburetor, you’ll need a few essential tools and supplies. These include:

  • A carburetor cleaning kit, which typically includes a cleaning solution, brushes, and a small blow gun
  • A screwdriver set
  • A pair of needle-nose pliers
  • A small bowl for soaking carburetor parts
  • A clean cloth or paper towels
  • Rubber gloves

These tools will help you disassemble, clean, and reassemble your carburetor effectively.

5. Can I clean my carburetor without taking it off the lawn mower?

While it’s possible to clean a carburetor without removing it from the mower, it’s generally not recommended. Removing the carburetor gives you easier access to all its parts and allows for a thorough cleaning.

It’s also easier to avoid damaging the carburetor or other engine components when working with it off the mower. If you’re not comfortable with carburetor cleaning, it’s best to consult a professional mechanic.

6. What if cleaning the carburetor doesn’t fix my Husqvarna lawn mower?

If cleaning the carburetor doesn’t solve your Husqvarna lawn mower’s running issues, there might be other underlying problems. These could include:

  • Faulty spark plug: A fouled or worn-out spark plug can hinder ignition and cause engine problems.
  • Fuel filter blockage: A clogged fuel filter can restrict fuel flow to the carburetor, leading to performance issues.
  • Air filter blockage: A dirty air filter restricts airflow, causing an improper fuel-air mixture and engine problems.
  • Damaged carburetor: If the carburetor itself is damaged, cleaning it won’t resolve the issue.

It’s essential to diagnose the problem accurately before attempting any repairs.

7. Where can I find more information about cleaning a Husqvarna lawn mower carburetor?

You can find comprehensive instructions and videos on cleaning your Husqvarna lawn mower carburetor by searching online or consulting your mower’s owner’s manual. Additionally, local lawn equipment dealers or repair shops can provide guidance and support.

Remember to follow safety precautions and wear appropriate protective gear while working with gasoline-powered equipment. If you’re unsure about any step, it’s always best to consult a professional mechanic.

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