How to Replace the Spark Plugs in a Lawnmower

As with any other machine, your lawnmower will last longer and provide better performance with periodic maintenance. Spark plugs are subjected to constant, intense heat during the mowing season and will burn out over time. Replace the spark plugs at the beginning of every season to prolong the mower's useful life and improve its performance. This procedure takes only a few minutes and one simple tool.

Spark plug wrench

Instructions

- 1
  Remove the ignition wire from the spark plug. The ignition wire is the wire that leads from the body of the motor to the rubber boot attached to the plug. Grasp the top of the rubber boot firmly and pull it off the plug.
- 2
  Place the spark plug wrench over the top of the plug. Slide the wrench over the plug until it is firmly seated on the plug's metal base.
- 3
  Rotate the wrench counterclockwise to loosen and remove the plug.
- 4
  Insert the new plug into the lawnmower. Rotate the plug clockwise two or three turns to start the threads.
- 5
  Place the wrench over the new plug. Rotate the wrench clockwise until the plug is firmly seated.
- 6
  Remove the wrench. Slip the boot of the ignition wire over the top of the new plug. Press the top of the boot firmly to seat the ignition wire.

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