Husqvarna Lawn Mower Carburetor Problems (Solutions Included)

Carburetor issues can be a pain to know about and fix. Fortunately there are ways for you to fix your Husqvarna lawn mower’s carburetor. From disassembling and cleaning the parts, to replacing damaged ones you may be able to fix any type of problem yourself. So whether it be a clogged air filter or or an incorrectly adjusted component. Here are the answers to your Husqvarna lawn mower carburetor’s problems.

Table of Contents

What Is A Husqvarna Lawn Mower Carburetor?

At the heart of a Husqvarna lawn mower is its carburetor, which is a small device that regulates the air and fuel mixture in the engine. The carburetor works by drawing fuel from the gas tank and then sending it to the engine where it is mixed with air for combustion. As the engine runs a butterfly valve inside the carburetor adjusts this mix according to changing conditions like temperature and altitude.

Husqvarna Lawn Mower Carburetor Problems

 1. Air Filter Issue

When it comes to solving your Husqvarna lawn mower carburetor problems then the air filter is a great place to start. The main issue with the air filter is;

  • A clogged or dirty air filter

Troubleshooting The Air Filter Issue

  • Remove the air filter cover and take out the air filter elements.
  • Inspect the air filter for any rips or tears that could cause dust and debris to get into the carburetor.
  • If it looks fine then clean it with soapy water or prepare a solution of one teaspoon of detergent per quart of warm water and soak the elements for up to 30 minutes then rinse until all of the soap is removed.

2. Fuel Lines/ Clamps Problem

If your Husqvarna lawn mower’s carburetor is not running smoothly then the problem could be as simple as;

  • Faulty/ clogged fuel lines
  • Damaged/ dirty clamps

Troubleshooting The Fuel Lines/ Clamps Problem

  • Check the fuel lines for any signs of wear, such as cracking or bulging and replace them if necessary.
  • Check that all clamps are firmly connected and secure, as any loose screws can cause air leaks in the pathway and result in a lean air/gas mixture.
  • Clean away any dirt or debris that is blocking the clamps with a damp cloth before tightening them up for a tighter seal.

3. Trapped Gas Problem

Gas gets trapped (and causes the engine to start running inadequately) in the carburetor’s bowl due to;

  • A vacuum leak
  • A malfunctioning carburetor float valve

Troubleshooting The Trapped Gas Problem

  • Turn off the lawn mower and disconnect the spark plug to prevent accidental startup.
  • Empty any fuel from the tank and into a container for later reuse (Be sure to dispose of it safely when done.)
  • Remove the bowl cover at the bottom of the carburetor and loosen its screws until you can lift it off (this will expose any trapped gas beneath.)
  • Reinstall the screws on your bowl cover and tighten them securely before reconnecting your spark plug.

4. Idle Speed Screw Issue

When the idle speed screw on your Husqvarna lawn mower carburetor is not properly adjusted, it can affect the performance of the lawn mower. This screw needs to be adjusted carefully as too much or too little can cause issues with your engine’s performance.

Troubleshooting The Idle Speed Screw Issue

  • Start by running your lawn mower for a few minutes to ensure the engine is warm.
  • Locate and loosen the nut that secures the idle speed screw.
  • Turn the idle speed screw clockwise until it stops and then adjust it counterclockwise about one eighth of a turn and this should provide enough adjustment to get your lawn mower running properly again.
  • Tighten the nut to secure the adjustment.
  • Start your mower again and check to make sure it is running smoothly at idle speed.
  • Test to make sure adjustments are correct by revving up your mower and increasing its speed.

5. High Speed Needle Issue

The high-speed needle on a Husqvarna lawn mower’s carburetor regulates the maximum flow of fuel when the engine is running at full speed allowing the engine to run efficiently. Issues include;

  • Running too rich
  • Flooding
  • Running too lean

Troubleshooting The High Speed Needle Issue

  • Locate the high-speed adjustment screw on your Husqvarna lawn mower’s carburetor; this is usually marked with an H and will be red in color.
  • Turn the needle clockwise to reduce the amount of fuel that flows into the engine or turn it counterclockwise to increase fuel flow into the engine.
  • Start your lawn mower and let it warm up for a few minutes before testing it out at full throttle.
  • If your lawn mower is running smoothly and efficiently then you are done. If not then you have to repeat steps the steps above until you have achieved optimal performance.

How To Prevent Problems With The Husqvarna Lawn Mower Carburetor

  • Be sure to clean the air filter regularly and empty out any grass clippings that may have accumulated inside.
  • Also replace or clean your fuel filter every few months or so depending on how often you use your mower.
  • Inspect the hoses running from the engine to the carburetor as these may become porous over time. Make sure these hoses are kept properly secured.
  • Using low-grade fuel to be sure you are using quality fuel for optimal performance.

Can I Clean My Husqvarna Lawn Mower Carburetor?

Yes you can clean your Husqvarna lawn mower’s carburetor with a cleaning solution made for small engines and carburetors. You may also need to replace certain parts of the carburetor like the gaskets or O-rings.

What Are The Signs that My Husqvarna Lawn Mower Carburetor Needs Cleaning?

Common signs that your Husqvarna lawn mower carburetor needs cleaning or replacing are an insufficient fuel flow, trouble starting, and leaking fuel.


From examining the air filter, to changing the oil and replacing the spark plug, all these troubleshooting steps are straightforward and can be done really quickly. If your Husqvarna lawn mower carburetor’s problems seem to be beyond repair then you should seek help from a qualified technician. They will be able to diagnose and fix the issue with the utmost efficiency and further guide you on how to prevent the same problems from recurring. Because a healthy engine is the best way to ensure a long life for your lawn mower.