This article covers the soft fixes you can take if your petrol lawnmower is producing black smoke.


  • Black smoke is almost always caused because of a dirty air filter.
  • Please check and clean the air filter if dirty.

Checking and Cleaning the Air Filter

Sponge Air Filter

  1. Please check the air filter is clear of any dirt or debris.
  2. A clean sponge air filter would be either grey or yellow.
  3. If you have a sponge air filter which is dirty, you may clean the air filter using warm soapy water.
  4. To remove the air filter, unclip the filter cover on the side of your engine.
  5. Some models may use a securing screw which can be removed by hand or using a screwdriver.
  6. Please ensure you leave the filter to fully air dry before reinstalling.

Paper Air Filter

  1. A clean paper air filter would be white in colour.
  2. If you have a paper air filter, it is not possible to clean the air filter.
  3. If the air filter is dirty or damaged then you will need to purchase another filter.