As a lawn care expert, I understand how frustrating it can be when your lawn mower starts surging, causing it to run inconsistently and reduce efficiency.
In this comprehensive guide, I’ll help you identify the possible causes of the surging problem and provide step-by-step instructions to diagnose and fix the issue. Additionally, I’ll offer maintenance tips to prevent similar problems. Let’s get started.
Common Causes of Lawn Mower Engine Surging
A surging lawn mower is usually caused by one or more of the following issues:
- Dirty air filter
- Clogged carburetor
- Old or damaged spark plug
- Low oil levels
Step-by-Step Guide to Diagnose and Fix Surging Lawn Mower
Step 1: Check the Air Filter
A dirty air filter can cause your lawn mower to surge, preventing proper airflow to the engine. To inspect the air filter, take the following steps:
- Locate the air filter housing, typically on the engine’s side.
- Remove the air filter cover, usually secured by a screw or clips.
- Inspect the air filter for debris or dirt.
- If the filter is dirty, clean it with a soft brush or replace it with a new one.
Step 2: Inspect and Clean the Carburetor
A clogged carburetor can also cause lawn mower surging, as it reduces the proper flow of fuel to the engine. To inspect and clean the carburetor, follow these steps:
- Locate the carburetor, which is usually on the side of the engine, connected to the air filter housing.
- Remove any visible debris from the outside of the carburetor using a soft brush.
- Disconnect the fuel line and linkage from the carburetor.
- Remove the carburetor from the engine.
- Carefully disassemble the carburetor, keeping track of all parts.
- Use carburetor cleaner to clean all components, and use a soft brush or cloth to remove any debris.
- Reinstall the carburetor and reinstall it on the engine.
- Reconnect the fuel line and linkage.
Step 3: Check the Spark Plug
A damaged or old spark plug can lead to a surging lawn mower. Inspect the spark plug with these steps:
- Locate the spark plug, typically on the front or side of the engine.
- Disconnect the spark plug wire.
- Use a spark plug wrench to remove the old spark plug.
- Inspect the spark plug for damage, tear or wear. If it shows worn or damaged, replace it with a new one.
- Properly gap the new spark plug according to the manufacturer’s specifications.
- Install the new spark plug and reconnect the spark plug wire.
Step 4: Check the Oil Level
Low oil levels may cause your lawn mower to surge. To check and add oil, follow these steps:
- Locate the oil dipstick on your lawn mower, usually on the side or front of the engine.
- Remove the dipstick and clean it with a soft cloth.
- Reinsert the dipstick, then remove it again to check the oil level. Add more oil until you reach the full mark on the dipstick, if necessary. Reinstall the dipstick.
Maintenance Tips to Prevent Surging Lawn Mower in the Future
- To keep your lawn mower running smoothly, make sure to follow these maintenance tips:
- Change the air filter regularly.
- Clean and inspect the carburetor yearly.
- Replace the spark plug every year or two.
- Check oil levels before each use.
Once you’ve tackled the issue of a surging lawn mower, you can trust that your lawn care job will be easily completed.
If the problem persists or you encounter difficulties during these steps, contact a lawn care professional for help. Thanks for reading, and good luck keeping your lawn mower in tip-top shape.
What is engine surging?
Engine surging is an issue that causes the engine to run inconsistently and reduce its efficiency. Various factors, such as a dirty air filter, clogged carburetor, old or damaged spark plug, or low oil levels, can cause it. To diagnose and fix engine surging, follow the step-by-step guide mentioned above. Additionally, regularly maintain your lawn mower to prevent similar issues in the future.
Why is a small engine surging?
An uneven fuel flow typically causes a small engine to surge. This can happen due to a dirty or clogged carburetor, a damaged spark plug, low oil levels, or a dirty air filter.
How do I clean the carburetor on a lawn mower?
To clean the carburetor on your lawn mower, begin by locating the carburetor, typically on the side of the engine.
Then, disconnect the fuel line and linkage from the carburetor and remove it from the engine.
Carefully disassemble the carburetor, keeping track of all parts. Use carburetor cleaner to clean all components, then reassemble the carburetor and reinstall it on the engine. Remember to reconnect the fuel line and linkage before use.
What should I do if my lawn mower is still surging?
If your lawn mower is still surging after following these steps, contact a qualified lawn care professional for assistance. They can troubleshoot the issue and provide additional advice.
Why The lawn mower runs rough at full throttle?
If your lawn mower runs rough at full throttle, it may indicate a dirty air filter or clogged carburetor. Be sure to check these components and clean or replace them as necessary.
Additionally, you may want to inspect the spark plug for damage or wear and adjust the gap if needed. Finally, ensure that oil levels are at the correct level. If the problem persists, contact a lawn care professional for assistance.
Why is My lawn mower rattling?
If your lawn mower is rattling, it may be caused by a loose or worn part. Inspect the mower for any parts that are damaged or missing and replace them as necessary. Additionally, check for debris, such as rocks or twigs, that may be lodged in the blades and remove these items if found. Finally, ensure that all bolts and screws are tightened adequately for optimal performance.
If the problem persists, contact a lawn care professional for assistance.
Lawnmower engine surging can be frustrating, but with some basic troubleshooting steps and regular maintenance, you can quickly fix the problem and keep your lawnmower running smoothly.
Inspect the air filter, carburetor, spark plug, and oil levels for any damages or debris. Additionally, regularly maintain these components to prevent similar issues in the future. If the problem persists, contact a lawn care professional for help.
Douglas Mackalie is a Founder of Mackalies Garden. He is one of the most exciting people you’ll ever meet. He has 25 years of experience in horticulture and gardening, most of which he’s spent outdoors getting his hands dirty.