Why Your Lawn Mower Spits Out Grass: Troubleshooting Tips.

A lawn mower spitting out grass is likely caused by a dull blade or clogged chute. A dull blade tears the grass rather than cutting it cleanly, and a clogged chute obstructs the grass clippings from exiting the mower’s deck.

Both result in grass exiting the mower in an uneven manner. To ensure an even cut, you should sharpen the blade regularly and check the chute for any blockages before mowing your lawn. If the problem persists, try adjusting the blade height or cleaning the underside of the mower’s deck.

By maintaining your mower, you can enjoy a healthy and attractive lawn.

Why Your Lawn Mower Spits Out Grass: Troubleshooting Tips.

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Understanding The Problem

When your lawn mower spits out grass, it can mean a myriad of issues. Common causes include excessively damp grass, dull blades, cutting too low, and debris build-up. Identifying the cause before troubleshooting is crucial to resolve the problem effectively.

Failing to identify the underlying problem may lead to unnecessary replacements, costing you time and money. A dull blade can often be sharpened, while debris build-up can be easily cleared. Cutting too low or mowing wet grass can be resolved by adjusting blade height or mowing when grass is dry.

Regular maintenance and cleaning your lawn mower are key to prevent grass spitting and extend the lifespan of your equipment.

Fixing Dull Blades

Lawn mower blades should be sharp to prevent grass from being spitted out during cutting. Dull blades can cause uneven cuts, tearing of the grass blades, and leave the lawn looking brown and unhealthy. Signs of dull blades include a torn, rather than a clean cut.

It’s important to sharpen the blades regularly using a sharpening stone or a bench grinder. The blade should be inspected for damage and balance before remounting it. Alternatively, you can replace the blade altogether. Sharpening blades annually can improve the health of your lawn, reducing the risk of disease and pests.

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Remember to always turn off the engine and disconnect spark plug wires before working on your mower blades, and wear safety gear at all times.

Dealing With Clogged Air Filters

Clogged air filters can result in grass being spat out by your lawn mower. Common symptoms of clogged air filters include poor engine performance, hard starting, and an increase in fuel consumption. The main causes of a clogged air filter include operating the lawn mower in dusty or dirty conditions and not servicing the filter as recommended by the manufacturer.

Cleaning the air filter can be accomplished by tapping it gently or blowing it with compressed air. Replacing the air filter is essential if it is damaged or excessively dirty. Keep your lawn mower functioning properly and prevent grass spitting by routinely checking and maintaining your air filter.

Proper Fuel Mixture

To ensure your lawn mower spits out grass for all the right reasons, you must understand the fuel mixture ratio. An improper ratio can lead to a host of issues, including poor performance and damage to your mower. To mix fuel correctly, take one gallon of gasoline and add 2.

6 ounces of two-cycle engine oil. Make sure you mix well before adding it to your machine. Keep in mind that different manufacturers may have different ratios, so always check your owner’s manual. By properly mixing fuel, you can keep your lawn mower running efficiently, extend its lifespan, and ensure that your yard looks perfectly groomed every time you use it.

Replacing Worn Or Damaged Spark Plugs

Spark plugs are an essential component of a lawn mower’s engine. The spark plug is responsible for igniting the fuel mixture in the engine. Over time, the spark plug can become worn or damaged. Signs of a worn-out spark plug include difficulty starting the engine, poor performance, and increased fuel consumption.

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To properly replace a spark plug, first, locate the spark plug on the lawn mower. Using a spark plug wrench, remove the old spark plug. Then, install a new spark plug, making sure that it is tightened correctly. To test the spark plug, connect the spark plug wire, and try starting the engine.

If the engine starts smoothly, the spark plug replacement was successful. Remember to check and replace spark plugs regularly to ensure that your lawn mower is running smoothly.


All in all, a lawn mower spitting out grass is a common issue that can occur due to various reasons. However, it’s important to keep in mind that regular maintenance of your lawn mower can help avoid such issues. Check the blades for sharpness and damage, and make sure the deck is clean and free of debris.

Adjust the cutting height of your mower according to the season and the condition of your lawn. Keep the air filter and spark plug clean and make sure the oil is changed regularly. It’s always better to be proactive when it comes to the maintenance of your lawn mower, instead of dealing with unexpected issues.

By taking good care of your equipment, you’ll ensure a smooth and efficient mowing experience all summer long. Don’t forget to wear protective gear and follow safety instructions while you operate your lawn mower. Happy mowing!