Briggs and Stratton Lawn Mower Losing Power: Diagnose & Fixing

Briggs And Stratton lawn mower losing power can be caused by various factors, such as dirty air filters, clogged fuel lines, or worn spark plugs. These issues can lead to a reduction in engine performance and the mower’s ability to cut grass effectively.

Addressing these common maintenance tasks regularly can help ensure your lawn mower maintains optimal power and performance throughout its lifespan. Additionally, regular oil changes, proper fuel storage, and keeping the blades sharp can also contribute to the overall efficiency and power of your Briggs And Stratton lawn mower.

By practicing proper maintenance and addressing any issues promptly, you can keep your lawn mower running smoothly and effectively.

Common Causes Of Power Loss In Briggs And Stratton Lawn Mowers

There are several common causes for a Briggs and Stratton lawn mower losing power. Issues such as a clogged air filter, dirty spark plug, or low fuel supply can all contribute to power loss. Regular maintenance and troubleshooting can help resolve these issues and ensure optimal performance.

In this section, we will explore the common causes of power loss, including a clogged air filter, a dirty or faulty spark plug, and insufficient fuel flow.

Clogged Air Filter

  • A clogged air filter can restrict the airflow to the engine, leading to power loss in your lawn mower.
  • To check if the air filter is clogged, remove it from the mower and inspect it for dirt, debris, or oil buildup.
  • Clean or replace the air filter if necessary, ensuring that it is free of any obstructions.
  • Regularly cleaning or replacing the air filter can help maintain optimal airflow and prevent power loss in your Briggs And Stratton lawn mower.

Dirty Or Faulty Spark Plug

  • A dirty or faulty spark plug can result in a weak or inconsistent spark, causing power loss in your lawn mower.
  • Inspect the spark plug for any dirt, carbon deposits, or damages.
  • If the spark plug appears dirty, clean it using a wire brush.
  • If the spark plug is faulty or damaged, replace it with a new one to ensure proper ignition and power delivery.
  • Regularly checking and maintaining the spark plug can prevent power loss and promote smooth operation of your Briggs And Stratton lawn mower.

Insufficient Fuel Flow

  • Insufficient fuel flow can impede the engine’s performance and lead to power loss in your lawn mower.
  • Check the fuel tank for proper fuel levels and ensure that the fuel is clean and free from debris.
  • Inspect the fuel lines for any obstructions, cracks, or leaks.
  • If there are any issues with the fuel lines, repair or replace them accordingly.
  • Regularly inspecting the fuel system and ensuring proper fuel flow can help prevent power loss and maintain the efficiency of your Briggs And Stratton lawn mower.

How To Clean And Maintain Your Briggs And Stratton Lawn Mower

To clean and maintain your Briggs And Stratton lawn mower, check if the mower is losing power. Start by ensuring the air filter is clean, the spark plug is in good condition, and the fuel is fresh. Regular maintenance will keep your lawn mower running smoothly.

Is your Briggs and Stratton lawn mower losing power and struggling to cut through thick grass? Don’t worry, there are some simple steps you can take to clean and maintain your lawn mower, ensuring it runs smoothly and efficiently. In this section, we will guide you through the process of cleaning the air filter, cleaning the spark plug, and checking and adjusting the fuel flow.

Read on to learn how to keep your Briggs and Stratton lawn mower in top shape.

Steps To Clean The Air Filter:

  • Locate the air filter on your Briggs and Stratton lawn mower. It is usually located on the side or at the back of the engine.
  • Remove the air filter cover by loosening the screws or clips holding it in place.
  • Take out the air filter and inspect it for any visible dirt, debris, or damage.
  • If the air filter is dirty, gently tap it against a hard surface to remove loose particles. Alternatively, you can use compressed air to blow away the dirt.
  • If the air filter is heavily soiled, it is recommended to replace it with a new one. Consult your mower’s manual for the correct air filter model.
  • Before reinserting the air filter, clean the filter housing or box to ensure no dirt or debris is left behind.
  • Place the clean air filter back into its housing, making sure it fits properly.
  • Secure the air filter cover by tightening the screws or clipping it back into place.

How To Clean The Spark Plug:

  • Locate the spark plug on your Briggs and Stratton lawn mower. It is typically located on the front or side of the engine.
  • Carefully remove the spark plug wire by firmly grasping the boot and pulling it off the spark plug.
  • Use a spark plug wrench to loosen and remove the spark plug from the engine.
  • Inspect the spark plug for any signs of wear, such as a worn electrode or heavy carbon buildup.
  • If the spark plug is dirty or damaged, clean it using a wire brush or replace it with a new one. Ensure you use the correct spark plug type as specified in your mower’s manual.
  • Before reinstalling the spark plug, check the gap between the electrode and the spark plug tip. Adjust the gap if necessary using a spark plug gap tool.
  • Carefully insert the spark plug back into the engine and tighten it with the spark plug wrench.
  • Reattach the spark plug wire by pushing the boot firmly onto the spark plug.

Checking And Adjusting The Fuel Flow:

  • Start by turning off the Briggs and Stratton lawn mower and letting it cool down.
  • Locate the fuel tank and check the fuel level. If it is low, refill it with fresh, clean gasoline.
  • Inspect the fuel lines and ensure they are not cracked, leaking, or clogged. If any issues are found, replace the fuel lines.
  • If your lawn mower has a fuel filter, check and replace it if necessary.
  • Consult your mower’s manual to locate the carburetor. Clean the carburetor by removing any built-up debris or residue with carburetor cleaner.
  • Adjust the carburetor’s idle and throttle settings as per the instructions provided in your mower’s manual.
  • Once you’ve completed these steps, start your Briggs and Stratton lawn mower and observe if the power loss issue has been resolved.
  • Regularly maintain and clean your Briggs and Stratton lawn mower to prevent future power loss and ensure optimal performance.

Upgrading Your Briggs And Stratton Lawn Mower For Improved Performance

Upgrade your Briggs and Stratton lawn mower to regain lost power and improve its overall performance. Unlock its full potential with simple modifications that will make a noticeable difference in your yard work.

Here are some simple yet effective ways to enhance your mower’s power output:

Choosing The Right Fuel Type

To ensure optimal performance, it is crucial to use the right fuel for your Briggs and Stratton lawn mower. Consider the following fuel options:

  • Regular Unleaded Gasoline: With an octane rating of 87 or higher, this fuel type is commonly used for mowers and is easily accessible.
  • Ethanol-Free Gasoline: Ethanol can cause engine problems, so opting for ethanol-free gasoline can be a wise choice. Look for this fuel type at local gas stations or home improvement stores.
  • Ethanol-Blended Gasoline: If ethanol-free gasoline is not available to you, choose fuel with a maximum ethanol content of 10%. Higher ethanol levels can damage the engine.

Changing The Fuel Filter

Over time, the fuel filter in your lawn mower can become clogged with debris and restrict fuel flow, leading to decreased power output. Follow these steps to change your fuel filter:

  • Locate the fuel filter: Typically, it is situated between the gas tank and the carburetor, but refer to your mower’s manual for specific instructions.
  • Disconnect the fuel lines: Before removing the fuel filter, disconnect the fuel lines attached to it. Be cautious and wear gloves to prevent fuel spillage.
  • Replace the fuel filter: Install a new fuel filter by attaching it to the fuel lines. Ensure the connections are secure and free of leaks.
  • Reconnect the fuel lines: Once the new filter is in place, reconnect the fuel lines to their respective ports.
  • Test the mower: Start the engine and check for any fuel leaks. If all is well, your Briggs and Stratton lawn mower should regain its power.

Upgrading The Air Filter

A clean air filter is essential for optimal engine performance. Over time, the air filter can become clogged with dirt and debris, reducing airflow and causing power loss. Follow these steps to upgrade your air filter:

  • Locate the air filter housing: The air filter housing is usually located on the side or top of the engine. Consult your mower’s manual for precise instructions.
  • Open the housing: Remove the screws or clamps securing the housing and open it carefully.
  • Remove the old air filter: Take out the old air filter, making sure not to drop any debris into the carburetor or engine.
  • Install the new air filter: Place the new air filter into the housing, ensuring it fits snugly. Close the housing and secure it with the screws or clamps.
  • Test the mower: Start the engine and check for any unusual sounds or vibrations. Your upgraded air filter should improve the mower’s performance.

Regular Engine Maintenance Tips

Proper engine maintenance is crucial for maintaining the power of your Briggs and Stratton lawn mower. Follow these essential tips to ensure optimal performance and prevent power loss.

Checking and Changing the Oil:

  • Regularly inspect the oil level in your Briggs and Stratton lawn mower to ensure optimal performance.
  • Check the oil before each use to prevent engine damage.
  • If the oil is dirty or low, it’s crucial to change it as soon as possible.
  • A convenient way to determine if the oil needs to be changed is by using a dipstick.
  • To change the oil, carefully drain the old oil and replace it with fresh, clean oil.

Keeping the Engine Cool:

  • Overheating can cause significant damage to your lawn mower’s engine, leading to a loss of power.
  • Regularly check the cooling system, including the air filter, to ensure proper airflow.
  • Clean or replace the air filter as needed to prevent debris from clogging it.
  • Also, ensure that the engine cooling fins are clear of any dirt or debris.
  • Proper ventilation helps the engine cool down efficiently, so always mow in an open area and avoid tall grass that may restrict airflow.

Adjusting the Valves:

  • The valves in your Briggs and Stratton lawn mower need to be adjusted regularly to maintain optimum engine performance.
  • Worn-out valves can cause a loss of power and other engine-related issues.
  • Check the valve clearance periodically and adjust if necessary.
  • Consult your owner’s manual for instructions on how to adjust the valves correctly.
  • Properly adjusted valves ensure smooth engine operation and prevent power loss.

Optimizing The Blade Performance

Optimizing the blade performance is essential for Briggs and Stratton lawn mowers experiencing power loss. Achieve better cutting results by ensuring proper maintenance and sharpening of the blades regularly.

By sharpening the blades, adjusting the blade height, and cleaning the undercarriage, you can enhance your mower’s cutting efficiency and overall power.

Sharpening The Blades:

Keeping the blades of your lawn mower sharp is crucial for an effective cut. Dull blades can tear and damage the grass, leading to an uneven and unhealthy lawn. Here’s how you can sharpen the blades:

  • Before sharpening, make sure the mower is turned off and the spark plug wire is removed for safety.
  • Use a socket wrench to remove the blade from the mower deck.
  • Inspect the blade for any nicks or dents. If significant damage is present, it may be necessary to replace the blade.
  • Secure the blade in a vise and use a file or grinder to sharpen the cutting edge. Maintain the blade’s original angle while removing any burrs or imperfections.
  • Once sharpened, reinstall the blade and ensure it is properly tightened.

Adjusting The Blade Height:

Properly adjusting the blade height is essential for achieving the desired grass length. Here are the steps to adjust the blade height:

  • Refer to your lawn mower’s manual to locate the height adjustment mechanism.
  • Adjust the cutting height to your preferred setting. Different grass types may require different cutting heights, so it’s important to consider the specific needs of your lawn.
  • Make sure both sides of the mower deck are set at the same height to ensure an even cut.
  • Test the mower on a small area of your lawn and make any further adjustments as needed.

Cleaning The Undercarriage:

A clogged undercarriage can impede the performance of your lawn mower, causing it to lose power. Regularly cleaning the undercarriage is essential for optimal performance. Follow these steps to clean the undercarriage:

  • Turn off the mower and disconnect the spark plug wire to prevent accidental starting.
  • Raise the mower deck to its highest setting for better access to the undercarriage.
  • Use a putty knife or wire brush to remove any built-up grass clippings or debris from the undercarriage.
  • Rinse the undercarriage with a water hose, ensuring all residue is removed.
  • After cleaning, lower the mower deck to its desired cutting height and reconnect the spark plug wire.

Enhancing The Mowing Technique

Discover effective techniques for enhancing your mowing experience with your Briggs and Stratton lawn mower, even if you’re facing the issue of it losing power. Focus on optimizing your mowing technique to ensure efficient and productive lawn maintenance.

In this section, we will explore some effective techniques to enhance your mowing technique and ensure maximum efficiency.

Proper Mowing Patterns For Maximum Efficiency

To achieve a well-groomed lawn and prevent your mower from losing power, it is important to follow proper mowing patterns. Consider the following tips:

  • Start mowing in a straight line from one side of the lawn to the other, ensuring slightly overlapping strips.
  • Alternate the direction of your mowing pattern with each session to prevent soil compaction and promote even growth.
  • Avoid mowing in a circular motion, as this can lead to ruts and uneven grass height.

Avoiding Overloading The Mower

Overloading your Briggs and Stratton lawn mower can put excessive stress on the engine and result in power loss. Follow these guidelines to avoid overloading:

  • Adjust the cutting height of your mower to a level that does not strain the engine. Cutting a large amount of grass at once can overload the mower.
  • Make sure to mow when the grass is dry. Wet grass tends to clump together, putting additional strain on the mower’s engine.
  • Take breaks between mowing sessions, especially when dealing with particularly tall or thick grass. This allows the mower’s engine to cool down and prevents overheating.

Effective Grass Discharge Strategies

Proper grass discharge is crucial to maintain the power and performance of your Briggs and Stratton lawn mower. Here are a few strategies to ensure effective grass discharge:

  • Use a mower equipped with a side discharge chute or a mulching feature. Side discharge chutes help expel cut grass efficiently, preventing clogging.
  • Avoid letting the grass clippings accumulate excessively. If the discharge chute or mower deck becomes clogged with clippings, it can lead to power loss.
  • Regularly clean the discharge chute and mower deck after each use to remove any grass clippings or debris that can hinder proper discharge.

By following these mowing techniques, you can optimize your Briggs and Stratton lawn mower’s performance and prevent power loss. Remember to maintain the mower regularly and address any mechanical issues promptly to ensure it operates at its best. Happy mowing!


Overall, if your Briggs and Stratton lawn mower is losing power, it is essential to address the issue promptly to ensure optimal performance. By following the troubleshooting tips discussed in this blog post, you can easily identify and resolve common causes of power loss.

Remember to check the fuel system, spark plug, air filter, and blade condition regularly, as these components play a significant role in the mower’s power output. Additionally, don’t forget to schedule regular maintenance and adhere to proper operating procedures to prevent power loss in the first place.

By taking these steps, you can keep your lawn mower running smoothly, efficiently, and powerfully, allowing you to maintain a well-manicured lawn all season long. So, if your Briggs and Stratton lawn mower is experiencing power loss, don’t fret. With the information provided in this blog post, you’re now equipped to tackle this issue head-on and get your lawn mower back to its optimal performance.

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