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  • Writer's pictureJohn C

Save Money Doing It Yourself: A Simple Guide to Servicing Your Rotary Petrol Mower

Updated: Oct 25, 2023

A lawn mower in JCs  garden. With all the service parts. Oil, Air Filter, Spark Plug and oil
All the new service parts next to mower. Oil, Air filter, spark plug and oil drip tray.

If you own a small rotary petrol mower, regular servicing is key to keeping it running smoothly and ensuring a healthy lawn. But you don't have to break the bank to keep your mower in tip-top shape. With a little know-how, you can save money by servicing your mower yourself. Here's how:

Disconnect the spark plug to ensure your safety before beginning any maintenance work. This is usually a push-on / pull-off connector.

 JC changing the oil on a mower A person named JC is emptying a mower of oil. The person is holding a drain pan under the mower to catch the used oil.
JC changing the old oil on a mower

  • Changing the old mower oil. Locate the oil drain plug, On my Honda mower it's the same plug as the oil top up, which is typically located on the side of the engine. Position a container underneath the drain plug to catch the old oil. Be quick and swiftly turn the mower on its side, otherwise, you risk missing the container. Have a practice turning the mower on its side before removing the drain/fill plug. I replace the old oil with new oil once every year. TIP - How to create your own cheap oil drip tray

fitting a new air filter to a rotary lawn mower.
Fitting a new rotary mower air filter

  • Replacing the old mower air filter. The air filter prevents dust and debris from entering the engine, which could cause engine damage or rough running of the engine if it becomes clogged. I replace the air filter with a new one, once every year.

Removing  a mower spark plug with a socket ratchet.
Removing s spark plug from a mower

  • Remove and Inspect the spark plug for wear and tear.

New spark plug (left) vs. old spark plug (right)
New spark plug (left) vs. old spark plug (right)

  • Check and replace it if necessary. This is an essential component that provides the spark needed to ignite the fuel in the engine. I replace the old spark plug with a new one once every year.

Underneath a rotary lawn mower that requires a clean.
Underneath a rotary lawn mower that requires a clean.

  • Check the blades for damage or dullness, and sharpen or replace them if necessary. Dull blades can lead to an uneven cut and damage to your lawn. Also, give the underside of the mower a clean and scrape off any stuck on old muck or old grass. This helps with the collection and flow of grass going into the grass collecting box.

In conclusion, servicing your small rotary petrol mower yourself can save you money and ensure a healthy lawn and mower. With these simple steps and photos, you can easily maintain your mower and keep your lawn looking its best.


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