If your lawn mower engine is surging like a rollercoaster, it’s time to roll up your sleeves and get it back on track.
A surging engine can be frustrating, but fear not! With a few simple steps, you can troubleshoot and fix the issue yourself.
In this guide, we’ll walk you through the process of identifying and resolving the problem. From checking the air filter to inspecting the spark plug, we’ve got you covered.
By the time you’re done, your lawn mower will be running smoothly once again. So, let’s get started and put an end to that surging engine!
Check the Air Filter
Check the air filter for any clogs or dirt that may be causing the engine to surge. The air filter plays a crucial role in keeping your lawn mower’s engine running smoothly.
Over time, the air filter can become clogged with dirt, grass clippings, and debris, restricting the airflow to the engine. This restriction can lead to a surge in the engine as it struggles to maintain a consistent power output.
To inspect the air filter, locate the air filter housing, which is usually positioned near the carburetor. Remove the cover and carefully take out the air filter.
Hold it up to the light and check for any blockages. If you notice a substantial buildup of dirt or debris, it’s time to clean or replace the filter.
A clogged air filter can be easily cleaned by tapping it gently to dislodge the dirt or by using compressed air to blow out the debris. If cleaning doesn’t restore proper airflow, it’s best to replace the air filter with a new one to ensure optimal engine performance.
Inspect the Spark Plug
Make sure to remove the spark plug and examine it for any signs of wear or fouling. A worn or fouled spark plug can cause a lawn mower engine to surge or run unevenly.
Start by disconnecting the spark plug wire and using a spark plug wrench to carefully remove the spark plug from the engine. Once the spark plug is out, inspect the electrode and the insulator for any buildup of carbon or oil deposits. If you notice any black, dry, or oily residue on the spark plug, it may need to be cleaned or replaced.
Using a wire brush or a spark plug cleaner, gently remove any deposits from the spark plug. If the spark plug shows signs of damage, such as a cracked porcelain insulator or a worn electrode, it should be replaced with a new one.
Additionally, check the spark plug gap using a feeler gauge and adjust it to the manufacturer’s specifications if necessary. A well-maintained spark plug is essential for a smooth-running lawn mower engine.
Clean or Replace the Carburetor
To address the issue of a surging engine on your lawn mower, inspect the carburetor for any signs of dirt or clogs.
The carburetor is a crucial component that mixes air and fuel for combustion in the engine. Over time, it can become clogged with dirt, debris, or old fuel, leading to engine surging.
Start by removing the carburetor from the mower and carefully disassembling it. Use a carburetor cleaner to thoroughly clean all the components, including the jets, float, and needle valve. Pay close attention to any small openings or passages where dirt and debris may be trapped.
If the carburetor is heavily corroded or damaged, it may be necessary to replace it with a new one.
Once cleaned or replaced, reassemble the carburetor and reinstall it on the lawn mower. After reattaching all the necessary components, start the engine and observe if the surging issue has been resolved.
Cleaning or replacing the carburetor can often eliminate surging problems and restore smooth operation to your lawn mower.
Adjust the Governor
Inspecting and adjusting the governor can help regulate the engine speed and address surging issues that may persist after cleaning or replacing the carburetor.
Start by locating the governor arm and the governor spring. The governor arm is usually connected to the throttle of the carburetor, while the governor spring is attached to the arm and the governor shaft.
To adjust the governor, first, loosen the nut that holds the governor arm to the shaft. Then, rotate the governor arm in the same direction as the governor shaft to increase the engine speed or in the opposite direction to decrease it. Once the desired speed is achieved, tighten the nut back to secure the governor arm.
It’s important to ensure that the throttle linkage moves freely and isn’t obstructed. After making adjustments, test the mower to see if the surging issue has been resolved. If the problem persists, further adjustments may be necessary.
Proper adjustment of the governor can effectively stabilize the engine speed and eliminate surging.
Verify Fuel System Components
Check the fuel lines and filter for any signs of clogs or damage. If you notice any blockages or tears, it could be causing fuel flow issues, leading to engine surging.
Here are a few steps to verify the fuel system components:
- Inspect Fuel Lines: Look for any kinks, cracks, or leaks in the fuel lines. These issues can disrupt the flow of fuel to the engine, resulting in performance problems.
- Check Fuel Filter: Remove the fuel filter and inspect it for dirt, debris, or clogs. A dirty or clogged filter can restrict fuel flow and cause engine surges.
- Examine Fuel Tank: Inspect the fuel tank for any sediment or contaminants that may have accumulated at the bottom. These particles can clog the fuel lines and affect engine performance.
- Test Fuel Pump: If your lawn mower has a fuel pump, ensure that it’s functioning properly. A faulty fuel pump can lead to inadequate fuel delivery, causing the engine to surge.
Frequently Asked Questions [FAQs]
How Often Should the Air Filter on a Lawn Mower Be Replaced?
You should replace the air filter on your lawn mower at least once a season, or more frequently if you use it frequently or in dusty conditions. A clean air filter is essential for optimal engine performance.
Can Using the Wrong Type of Spark Plug Cause Surging in a Lawn Mower Engine?
Using the wrong spark plug can cause surging in a lawn mower engine. To fix this, ensure you’re using the correct spark plug for your mower. Check the manufacturer’s guidelines and replace with the appropriate plug.
What Are Some Signs That the Carburetor Needs to Be Cleaned or Replaced?
If your lawn mower engine is surging, signs that the carburetor needs cleaning or replacing include rough idling, stalling, and difficulty starting. Look for visible dirt or debris and consider using a carburetor cleaner.
What Is the Governor on a Lawn Mower Engine and How Does It Affect Engine Performance?
The governor on a lawn mower engine controls the speed by adjusting the throttle. If it’s not functioning properly, it can cause surging or uneven performance. You can fix this by inspecting and adjusting the governor linkage.
What Are Some Common Fuel System Components That Could Cause Surging in a Lawn Mower Engine?
If your lawn mower engine is surging, check the fuel system components. Common culprits include a dirty carburetor, clogged fuel filter, or old fuel. Cleaning or replacing these parts can often resolve the surging issue.
Conclusion
So, now you know how to fix a surging engine on a lawn mower. By checking the air filter, inspecting the spark plug, cleaning or replacing the carburetor, adjusting the governor, and verifying fuel system components, you can solve the issue and get your lawn mower running smoothly again.
With these simple steps, you can save time and money by avoiding costly repairs or replacements. Keep up with regular maintenance to keep your lawn mower in top condition.
