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.

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Additionally, how can you tell if a spark plug is good?

Test the spark plug ignition by disconnecting the spark plug wire from the spark plug. Hold the end of the spark plug wire close to a metal surface. If the spark plug is good, you will see a spark or you'll hear a crackling noise. This means that voltage is getting through the wire to the spark plug.

Moreover, how do you check a spark plug without a tester?

Beside this, how often should you change spark plugs in lawn mower?

What happens when one spark plug is not firing?

Failing spark plugs can cause the car engine to misfire and thus affect its performance. A single spark plug that fails to ignite the fuel-air mixture can cause a halt in the running of the engine. It can result in incomplete combustion and damage to the catalytic converter of the car.