How to Change your Lawn Mower Spark Plug

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If you’re having trouble starting your lawn mower, it might be your spark plug. Watch this how-to video for easy steps on how to change your lawn mower spark plug.

Video Transcript

Having trouble starting your lawn mower? The problem might be your spark plug.

You probably know that this little plug produces the powerful spark that starts your mower. If it gets fouled or starts to fail for some other reason, your engine will be harder to start. Before you replace your spark plug, be sure to read the important safety information in your operator’s manual. Then just follow these simple steps.

  1. Disconnect your spark plug lead and give it a quick once-over to make sure the wire is in good shape and the connector is clean.
  2. Clean the area around the spark plug to keep any dirt or debris out of the combustion chamber.
  3. Then, remove the spark plug with a socket wrench or spark plug wrench. Your local Toro service dealer is the best place to get the correct replacement spark plug for your machine. Bring your machine’s model and serial number so you’re sure to get the right plug.
  4. Today’s spark plugs come pre-gapped, but it’s a good idea to double check this before installation.
  5. Use a gap tool and make sure the gap matches the specs for your machine.
  6. Screw the new spark plug in by hand for 4 to 5 turns. If you aren’t able to do this – stop and bring the machine to an authorized Toro service dealer. We want to avoid cross-threading the plug, which would damage your engine.
  7. Once the plug is finger tight, use your wrench to tighten the plug that’s specified in your operator’s manual. This should be a very minor adjustment.
  8. Do not over tighten, as that can cause damage to your engine.
  9. Finally, reattach the spark plug lead and make sure the connector is positioned vertically and seated securely on the end of the plug.

And that should be all it takes to restore a healthy ignition spark. Now just start it up and go!