How to tell if a lawn mower spark plug is bad

The spark plug is a small cylindrical device that uses electricity to launch the gas-air mixture in the engine, which allows the engine to start and continue to work. This is done by converting the input voltage into a spark inside the engine cylinder, creating pressure for ignition of fuel inside. This ignition makes the piston sink, generating power for the engine. The exhaust pushes the piston up again, and the cycle is repeated.

How to change a spark plug in a lawn mower?

Over time, a faulty ignition is becoming an increasingly serious problem. It manifests itself as frustration in the form of traction of attraction.

The ignition starter is an element that must be regularly replaced, regardless of how often the user performs maintenance. The frequency of replacement depends on how often the mower is used every season.

If gasoline does not burn completely or efficiently, fuel consumption will increase, and the efficiency of fuel use will be low. The air smells of fuel and can often smell of wet gasoline, because gasoline does not burn properly. Use a soft wire brush to clean the engine.

Spark plug installation tips

All gasoline-powered lawnmowers and snowblowers, as well as handheld products such as chainsaws, trimmers, and blowers, use a spark plug that ignites a fuel/air mixture to start and operate the equipment’s engine. The ignition process depends on the correct balance of fuel and air entering the engine from the carburetor, a good ignition coil and a good spark plug. When the engine starter cable is taut, the starter engages with the flywheel drive cup, turning the crankshaft to move the piston up and down in the engine cylinder. As the piston descends, it draws fuel and air into the combustion chamber of the engine. A permanent magnet is built into the flywheel, and as it passes through the ignition coil, a magnetic field is created and electricity is generated, and a high voltage pulse is applied from the ignition coil to the spark plug. When the piston reaches the top of the cylinder, the spark plug ignites the compressed air/fuel mixture, pushing the piston down. The spent fuel is expelled through the exhaust port, fresh fuel enters through the intake port, and combustion is repeated to keep the engine running.

That’s about 9 million ohms with a 20, 000 volt spark. With little resistance, it will drop down. It is also possible to measure from ground to a small electrode inside the plug. Now there are fewer of them.

For self-propelled lawnmowers, it seems like it takes a long time for the starter to crank the engine, which overloads it and affects battery life.

Only wet gasoline or oil spark plugs can be cleaned without visible damage. Oil-soaked spark plugs mean that the engine is leaking oil, mainly from the cylinder head and piston.

How Long Does a Lawn Mower Spark Plug Last?

If you’re not sure if it’s the 25-hour mowing season, keeping a log of how many hours you’ve used your mower can help you determine how often to change your spark plugs.

If the equipment still does not start, it will flood the engine. In this case, the engine will not start until excess fuel has been expelled from the cylinder. The quickest way to fix this problem is to remove the spark plug and drain the fuel. Check the condition of the spark plugs when they are removed and replace if necessary.

What Makes a Spark Plug Go Bad?

Some users replace it every season as part of mower maintenance. If you use it for the full 25 hours each season consider it as an option to avoid spark plug problems.

In this case, the spark created by the light of the ignition is too weak for ignition of the air-fuel mixture in the cylinder. Every time you try to start the engine, more fuel enters the cylinder. The more fuel you have, the more difficult it will be to start the engine.

Cleaning your Spark Plug:

The spark plug of the lawn mower is under the black wire of the spark plug. Remove and check the wires and connectors. You will need a head of a suitable size and a screwdriver with a ratchet to remove the fork.

As we mentioned earlier, the engine of the lawn mower can turn on once, and then suddenly turn on, it would seem, for no reason. Now that you understand how the spark plugs work, you can better understand what is happening.

Replacing a Spark Plug:

The manufacturer of your braid can sell a set for storage at the end of the season.

The spark plug heats up due to the prolonged operation of the engine, and the gap between the ignition electrode and the center of the spark plug increases, and the spark of the ignition can become weaker.

Cleaning Or Replacing the Air Filter

Nevertheless, proper maintenance of the engine of the lawn mower and other components can reduce the conditions of premature wear of the spark plugs.

Another possible reason for failure is the need to adjust the gap formed by the light of the ignition. The difference between the right and wrong gap is several thousand-inch, probably too small to be seen by the human eye. Use the instrument to measure the gap of the spark plug to measure the gap of the spark plug and, if necessary, adjust the gap, and contact the operating manual for your car to find out what the ignition gap is.

Clean all the dirt and garbage around the base of the spark plug to prevent accidental garbage entering the cylinder when extracting the spark plug.