How do I know if my lawn mower spark plug is firing?
Likewise, how do I clean the spark plug on my lawn mower?
Thereof, what causes no spark on lawn mower?
Ignition Module Failure
When it does fail, it is usually due to heat caused from improper wiring of the ground wire to battery voltage. If the engine does not produce spark, other areas of the ignition system should be checked before focusing on the ignition module as source of failure (see above).
How do you clean a lawn mower carburetor without removing it?
However, you can not spray the carburetor when the engine is off since it cannot do the cleaning without being propelled. All you need to do is to start the engine and spray directly at the center of the carburetor while it is running. Any deposits clogging in the carburetor will easily be removed.