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What does an Air Filter do?

Having a properly functioning air filter is your lawn mower's first line of defence against the dirt and debris that is kicked up during the mowing process. When the air filter is in good condition and working properly, it prevents dirt from entering the engine through the carburettor. But if the air filter is worn out, dirt and other debris can make their way into the engine.

Is it ok to run a lawn mower without an air filter?

A lawnmower should never be run without an air filter because your engine will suck in debris and harmful particles along with the air. The amount of air will also be higher and can upset the air-fuel ratio and make your engine run less efficiently.

How often should you change your lawn mower air filter?

Most people will need to change their lawn mower air filter one time per season. However, if you have a very large yard, or often mow your neighbour's lawns, you may have to change it more frequently. The rule of thumb is that your filter should last for 300 hours of operation.

Common signs that your air filter needs to be replaced

Signs may include but are not limited too:
Reduced fuel economy
Misfiring engine
Unusual engine sounds
Air filter appears dirty
Reduced horsepower

How to Replace Your Air Filter:

Replacing a lawn mower's air filter is not difficult and you can do it in your own garage.

  1. Remove the screws or undo the clips that secure the lawn mower's protective shroud (covering) over the air filter.
  2. Remove the air filter. For a paper filter, gently tap it on a flat surface to remove any loose dirt. Examine the filter and hold it up to a bright light source. If the filter's paper element blocks a significant amount of light, then it's time to replace it. For a foam filter, look for telltale brown or yellow staining, which indicates it's time to replace it.
  3. Inspect the pre-filter (if the mower is so equipped). The pre-filter is almost always made of foam, and if it has become stiff, brittle or significantly stained, replace it.
  4. Clean the air filter housing with a dry cloth. Do not use solvents, as they can damage the air filter element. And do not use compressed air, which could force debris down the throat of the lawn mower's carburettor.
  5. Insert the new filter element into the air cleaner assembly.
  6. Reattach the protective shroud, being careful not to pinch or otherwise damage the air filter element in the process. Never force the shroud into place. If it does not reassemble easily, you've probably inserted the new filter element incorrectly.

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