How do you test a spark plug on a lawn mower?

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

Here’s How to Know if a Lawn Mower Spark Plug is Bad

  1. You can’t get the engine to fire up at all.
  2. You have to tug extra hard for longer than usual on the rewind.
  3. Your lawn mower loses power while moving.
  4. The gas runs out quicker than it used to.

What resistance should a spark plug have?

When spark plugs are new, the resistance value is between 500 and 3000 ohms. As the plug ages, values below 5000 ohms are acceptable. But once the plug’s resistance value exceeds 5000 ohms, the plug should be replaced. If a spark plug falls off a workbench or is dropped, it’s possible for the carbon resistor to break.

Can you check spark with a multimeter?

You can check for spark using a multimeter, test light, screwdriver, or even remove the spark plug and ground it on the engine block or frame.

IT IS IMPORTANT:  Can you jump start a John Deere mower?