How do I know if my lawn mower spark plug is bad?

Thumbtack Editors

It may be time to replace your spark plug if:

  • The engine is dying or failing.
  • You have to add more gas than usual.
  • The spark plug is visibly damaged and broken.
  • You’re having a harder time getting the lawn mower to start. 

If you suspect your lawn mower's spark plug has gone bad, hire a pro to confirm your suspicions. A repair technician can identify the problem and perform repairs.

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