Common Lawnmower Problems and How to Fix Them

Common Lawnmower Problems and How to Fix Them

Common Lawnmower Problems and How to Fix Them


As a lawncare enthusiast, you take pride in maintaining a healthy and beautiful lawn. However, like any machine, lawnmowers can experience issues from time to time. From a stubborn engine that won’t start to excessive vibration and uneven cutting, these common lawnmower problems can be frustrating. But fear not, my grass guru friends! In this comprehensive guide, we will explore the most common lawnmower problems and provide you with step-by-step instructions on how to troubleshoot and fix them yourself. By addressing these issues promptly, you can ensure your lawnmower stays in tiptop shape and your lawn looks its best.

Section 1: Engine Won’t Start

There’s nothing more disappointing than heading out to tackle your lawn and realizing your lawnmower won’t start. But before you panic, let’s troubleshoot this common problem together. There are a few potential causes for a lawnmower engine not starting:

– Empty or old fuel: Check your fuel tank and ensure it’s filled with fresh gasoline. If the fuel is old or stale, drain it and refill with new fuel.
– Spark plug issues: A faulty or dirty spark plug can prevent your lawnmower from starting. Remove the spark plug, inspect it for any signs of damage or corrosion, and clean or replace it if necessary.
– Carburetor problems: A clogged carburetor can also hinder the engine’s ability to start. Remove the carburetor and clean it thoroughly, removing any debris or blockages.
– Ignition switch malfunction: Lastly, check your lawnmower’s ignition switch. If it’s faulty or not making proper contact, it may need to be replaced.

Remember, lawncare enthusiasts, safety first! Always disconnect the spark plug wire before attempting any troubleshooting. Additionally, consult your lawnmower’s manual for specific instructions regarding your model.

Section 2: Engine Misfires or Runs Rough

A lawnmower engine that misfires or runs rough can make cutting the grass a frustrating task. Here are the symptoms to watch out for:

– Jerky or uneven engine operation
– Stalling or sputtering while mowing
– Black smoke or excessive exhaust
– Loss of engine power

If you’re experiencing any of these issues, the following steps can help you troubleshoot and address the problem:

– Check the air filter: A dirty or clogged air filter can disrupt the air-fuel mixture, leading to a rough-running engine. Clean or replace the air filter as needed.
– Inspect the spark plug: Just like we discussed earlier, a faulty spark plug can cause engine misfires. Clean or replace the spark plug if necessary.
– Adjust the carburetor: If the carburetor is out of sync, it can result in an engine that runs poorly. Consult your lawnmower’s manual for instructions on adjusting the carburetor settings.
– Drain old fuel: Stale or contaminated fuel can also contribute to engine performance issues. Drain the old fuel from the tank and replace it with fresh gasoline.

Section 3: Excessive Vibration

When your lawnmower starts vibrating excessively, it not only affects your mowing experience but can also indicate larger underlying problems. Here are some common causes of excessive vibration:

– Unbalanced blades: Over time, lawnmower blades can become unbalanced, leading to increased vibration. Remove the blades, clean them, and sharpen them if necessary. If the blades are severely damaged, replace them.
– Bent crankshaft: A bent or damaged crankshaft can cause the engine to vibrate excessively. If your lawnmower experiences a hard impact or collision, it’s possible that the crankshaft may need to be replaced.
– Loose components: Check all the nuts, bolts, and screws on your lawnmower to ensure they’re tightened properly. Loose components can contribute to vibration issues.

Regular maintenance is crucial to prevent excessive vibration. Make sure to sharpen your lawnmower blades regularly, check for loose components, and follow the manufacturer’s recommended maintenance schedule.

Section 4: Uneven Cutting

Achieving a well-manicured lawn requires a lawnmower that cuts evenly. If you notice uneven cutting patterns, here are a few factors responsible:

– Uneven blade height: Check the blade height adjustment on your lawnmower. Ensure that the wheels are properly aligned, and adjust the blade height as needed to achieve an even cut.
– Dull blades: Dull blades can tear and shred the grass, resulting in an uneven cut. Sharpen your lawnmower blades regularly to ensure a clean cut every time.
– Sloped terrain: Mowing on slopes or hilly areas can also contribute to uneven cutting. Take extra care when mowing on uneven surfaces to achieve a consistent cut.

Additionally, consider mowing your lawn in different directions each time to promote even growth and prevent excessive wear on specific areas.

Section 5: Overheating

An overheating lawnmower can lead to engine damage and potentially hazardous situations. Keep an eye out for these indications of overheating:

– Excessive smoke or burning smell
– Engine running hot to the touch
– Engine stalling or shutting off unexpectedly

To prevent and fix lawnmower overheating, follow these practical steps:

– Clean the cooling system: A clogged cooling system can prevent proper airflow, leading to overheating. Remove any dirt, debris, or grass clippings from the cooling fins and air vents.
– Check the oil level: Insufficient oil levels can cause the engine to overheat. Check the oil level and add more if necessary.
– Monitor mowing conditions: Avoid mowing in extreme heat or for extended periods without breaks. Give your lawnmower time to rest and cool down between mowing sessions.

Remember, prevention is key! Regularly clean your lawnmower’s cooling system and ensure proper oil levels to help avoid overheating issues altogether.

Section 6: Loss of Power

If your lawnmower suddenly loses power during operation, it can be frustrating. Here are some common reasons for a loss of power:

– Dirty air filter: A clogged air filter restricts airflow, resulting in decreased engine performance. Clean or replace the air filter if necessary.
– Fuel supply issues: Check the fuel lines and filter for any blockages. Ensure that the fuel tank is filled with fresh gasoline.
– Worn-out spark plug: A worn-out spark plug can cause a loss of power. Clean or replace the spark plug if needed.
– Belt problems: If your lawnmower utilizes belts for blade operation, check for any signs of wear or damage. Replace any worn-out belts promptly.

Maintaining your lawnmower regularly and addressing these potential issues can help prevent sudden power loss. Be sure to follow the manufacturer’s recommended maintenance schedule and keep an eye out for any signs of wear or damage.


Maintaining a well-functioning lawnmower is essential for achieving a healthy and beautiful lawn. By proactively troubleshooting and fixing common lawnmower problems, you can ensure that your lawnmower performs at its best and your grass remains immaculate. Remember, my fellow lawncare enthusiasts, safety first! Disconnect the spark plug wire before attempting any troubleshooting and always consult your lawnmower’s manual for specific instructions. With a little know-how and some regular maintenance, you’ll be the master of your lawnmower in no time. Happy mowing!


Published by Marty

Hello there! I'm Marty Robbins, the man behind Growing up amidst the rolling green landscapes of Minnesota, my passion for lawns and their care took root in childhood and has only grown stronger over the years. With a blend of science and artistry, I founded as a sanctuary for both seasoned enthusiasts and green-thumbed beginners. My goal? To equip you with the knowledge and tools to craft your very own lawn oasis. Whether you're in search of expert guidance, sustainable solutions, or the latest in mower innovations, I'm here to help. Welcome to Lawnmower Heaven, and let's create some lawn magic together

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