How to Service a Petrol Lawnmower: The Ultimate Guide to Keeping Your Lawn Looking Lush!

Written By James
Updated July 12, 2023 by James

How to Service a Petrol Lawnmower: The Ultimate Guide to Keeping Your Lawn Looking Lush!

How To Service A Petrol Lawnmower

Servicing your petrol lawnmower can be a daunting task, but it doesn't have to be. With the right tools and a bit of know-how, you can give your lawnmower the maintenance it needs to keep it running for years to come.

Not only that, but you'll also be doing a service to your lawn and garden, since a well-serviced lawnmower will keep your outdoor space looking great.

So don't fret – follow these easy steps and you'll have your lawnmower running like new in no time.

Gathering the Necessary Materials

Ready to get started? Let's gather the materials you'll need to get your lawn-tending job done!

First and foremost, you'll need to make sure you have enough fuel for your lawnmower. You can purchase gasoline from your local hardware store that's specifically designed to run lawn mowers. Before fueling up, make sure to consult your lawnmower's manual to ensure you're using the correct type of fuel.

Next, you'll need to inspect the blades of your lawn mower. It's important to make sure the blades are sharp and in good condition. If they're rusty or dull, you'll need to replace them.

Once you've gathered the necessary materials, you're ready to move on to the next step: checking the spark plug.

Checking the Spark Plug

Let's take a look at the spark plug and make sure it's in good shape. The spark plug is an essential part of the lawnmower's ignition system, so it's important to check that it's in good condition.

First, you'll want to take it out and inspect it. If it's dirty or damaged, you'll need to replace it. If it looks good, you can clean it with a wire brush, then use a spark plug gap tool to ensure that it's set to the correct gap.

When that's done, you can put it back in and check the tuning of the ignition and inspect the carburetor.

Once you've checked the spark plug and made any necessary adjustments, you're ready to move onto the next stage.

Replacing the air filter will help to ensure that the lawnmower runs optimally and that your engine is properly lubricated.

Replacing the Air Filter

Replacing the air filter is a key step in making sure your engine runs smoothly and efficiently! Before you tackle this task, take some time to inspect the air filter. Look for signs of damage or dirt buildup, as this is a sign that the filter needs to be changed.

If it appears to be in good condition, take a few moments to troubleshoot the air filter to ensure it's working properly. Testing for air flow across the filter can be done with a vacuum cleaner. If the readings indicate that air flow is restricted, it's time to replace the air filter.

Once you've replaced the air filter, you'll be one step closer to having a perfectly serviced and maintained petrol lawnmower. To take the next step, you'll want to change the oil.

Changing the Oil

It's time to give your engine some TLC and change that oil!

Before starting, make sure you have the correct type of oil for your mower. Different fuel types require different oil types, so be sure to check your owner's manual for the correct type.

Many mower engines have a drain plug at the bottom of the engine, so the oil can be drained out. Make sure to replace the plug after draining.

Next, remove the oil filler cap and pour in the new oil. You may need to check the dipstick to make sure the level is correct. After filling the oil, replace the oil filler cap and start the mower to check for any leaks.

Changing the oil in your mower is a great way to keep it running smoothly. Taking care of this chore periodically will keep your mower running longer and help you avoid costly repairs.

Be sure to dispose of the used oil properly so it doesn't contaminate the environment.

With the oil changed, it's time to move on to cleaning the mower deck.

Cleaning the Mower Deck

Cleaning your mower deck regularly is essential to keeping your mower in top condition and ensuring it runs smoothly for years to come. To keep your mower working efficiently, you should take the following steps:

  • Tune your mower blades: Tuning your blades regularly will help you maximize the efficiency of your mower and make sure it runs smoothly.
  • Sharpen your blades: Sharpening your blades will help them cut through grass more efficiently and quickly.
  • Clean the underside of the deck: Removing any debris and dirt from the underside of the deck will help to keep your mower in top condition.
  • Lubricate the mower deck: Lubricating the mower deck will help to prevent rust and corrosion.

Regularly cleaning and properly caring for your mower deck will help your mower last longer and keep it running smoothly. It's worth the effort as it can save you time and money in the long run. Plus, taking care of your mower is a great way to show your love for nature.

Frequently Asked Questions

How often should a petrol lawnmower be serviced?

You should regularly maintain your petrol lawnmower to keep it running smoothly and efficiently. Checkup intervals should be done at least once a year, or when the lawnmower is used frequently.

A good checkup should include changing the oil, checking the spark plug, and replacing the air filter. Doing this will help keep your lawnmower in top condition and reduce the risk of any malfunctions or unexpected breakdowns.

Servicing your lawnmower regularly will also ensure that you're getting the most out of it and keeping your lawn looking its best.

What safety precautions should be taken when servicing a lawnmower?

When servicing a lawnmower, safety should always be a top priority. Protect yourself by wearing protective gear such as gloves, safety glasses, and long pants.

Make sure the engine is off and the spark plug is disconnected before working on the lawnmower. Additionally, when changing the oil, dispose of it properly and use the recommended type and amount for your mower.

Taking the time to follow these simple safety precautions can help ensure you stay safe while servicing your lawnmower.

Are there any special tools needed for servicing a petrol lawnmower?

Servicing your petrol lawnmower is an important part of preventative maintenance. To ensure the job is done right, there are some special tools you should have on hand.

Drain the fuel from the tank and use a spark plug socket wrench to remove the spark plug. You'll also need a socket wrench set to adjust the carburetor and a spark plug gapping tool to check the gap on the spark plug.

With the right tools, you can ensure your lawnmower's running like new.

Are there any special considerations for storing a petrol lawnmower?

When it comes to storing a petrol lawnmower, safety should always be the top priority. Make sure to read your lawnmower's manual for the recommended fuel storage guidelines.

Fuel should be stored in an approved container away from any heat sources, and out of the reach of children.

Additionally, if you intend to store the lawnmower for an extended period of time, it's recommended to empty the fuel tank and add fuel stabilizer to the remaining fuel in the tank or fuel lines. This will help keep the fuel from degrading and help maintain the overall quality of your lawnmower.

Are there any tips for troubleshooting common lawnmower problems?

Troubleshooting common lawnmower problems can be daunting, but it doesn't have to be. With a few simple steps, you can get your mower back in running order in no time.

Start by checking the fuel flow. Is it blocked or insufficient? If so, clear the obstruction or replace the fuel filter.

Next, check for an oil leak. If the oil level is low, you may need to refill it and check for any cracks or leaks in the lines.

With a little bit of troubleshooting and a few simple steps, you can get your lawnmower running again in no time.


You've done it! You've serviced your petrol lawnmower like a pro. You've checked the spark plug, replaced the air filter, changed the oil, and cleaned the mower deck.

Now, it's good as new and ready to be used again. You can feel confident and proud of the job you've done.

Take a few moments to pat yourself on the back, grab a cup of coffee, and enjoy the fruits of your labor. You've just saved yourself a lot of money and time.

So, sit back, relax, and enjoy the sound of your mower humming away in the garden.

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My father, and his father before him, and his father; for the past 3 generations, my family have always been into gardening. The green fingers is a gift passed down to me and I thoroughly enjoy it! I also have worked in the manufacturing department for Bosch and DeWalt so I like to think I know a thing or two about tools and such!
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