When the spring comes and we get the lawn mower out again, we have to check few things before we start the mower.

Use fresh gas. If you forgot to drain the gas tank last fall then you should replace the gas. Gasoline that is older than a month has lost some of its energy and can lead to problems with the carburetor and engine.

Change the engine oil. Find the drain plug and drain the oil to a container, replace it with clean SAE-30 engine oil. Check the owners manual for oil recommendations. The oil should be changed at least once a year.

Replace the spark plug. You can take the old spark plug to your local gas station or service shop or find the type and gap information in the owners manual. A new spark plug is inexpensive and can save you a lot of trouble later.

Check the air filter. Tap the filter on a flat surface or carefully clean it with pressurized air. If the filter is very dirty, it should be replaced. Only foam filters should be cleaned with water.

Have a look at the blade. Is it dull? Is it broken or bent? If so then replace the blade. A dull blade can be sharpened with a file or grinder but never try to do it on the mower. Some blades are dual-edge and can be turned over but most blades have to be replaced or sharpened.

Check the drive belt. If your lawn mower has a drive belt then check it for wear and lack of tension. You should be able to move the belt sideways about half an inch with one finger if the tension is correct.

Clean the mower deck. Disconnect the spark wire from the spark plug to prevent engine from starting. Use water and a soft brush to carefully clean the outside of the mower deck around the engine. Turn the mower 90 deg on its side, with the carburetor facing up and clean the inside of the deck, using a wooden stick to remove heavy grass build-up.