![]() The difficulty of starting the engine increases after each attempt as the engine warms up. The engine will shut off or stop mowing because the spark plug is not functioning correctly, and you’ll find the engine sputtering before it dies. Poor Performance:Įven if the engine starts with a bad spark plug, it can take many attempts it won’t be able to continue running for long. The mixture floods the engine as it enters the cylinder, and only a small portion ignites. The spark produced by a malfunctioning spark plug does not ignite the air-fuel mixture from the carburetor via the fuel tank. Knowing what a spark plug does helps to make the explanation of this symptom fairly simple. Similarly, you won’t be able to start a lawn tractor’s engine with just one turn of the key. It will take several pulls on the starter rope when using a push mower before the engine turns on. A damaged spark plug prevents a bad engine start. This is the most common symptom of a bad spark plug. You know the major symptoms now let’s get into their details so that judging becomes more comfortable for you. How to Tell If a Lawnmower Spark Plug is Bad ![]() The worst-case scenario is that your engine might not even turn on. There will be no ignition or improper ignition if the spark plug cannot perform its job properly, which can cause a variety of issues. ![]() The spark ignites the fuel and air mixture inside the cylinder head. The spark plug in a lawnmower’s engine does the same job as in a car engine.Ī spark plug is an electrical device that creates a spark as the magneto or the ignition coil delivers a high voltage to the central electrode. (Learn How Long Does Ethanol Free Gas Last)Ī spark plug is an essential component of a gasoline-powered engine despite its diminutive size. By the end, you’ll know all the reasons why your spark plugs are bad and whether you need to change spark plugs, or it just needs cleaning, or you need a spark plug gauge to test the spark plug gap. Our guide will focus on a spark plug on a lawn mower. Spark plugs are required for a gasoline-riding lawnmower, chainsaws, or other gasoline-powered devices or vehicles to ignite fuel in the combustion chamber to function properly. The air-fuel mixture in the cylinder is ignited by a spark created to flow through the tiny gap between the two electrodes. Bad spark plugs are a likely reason your engine is having trouble starting.Ī center electrode and a side-firing electrode are the two electrodes on a spark plug. But there is frequently a simple solution if you know the cause of the issue. The first thing to do is change the spark plug.It can ruin your day when you try to mow your lawn, but your mower is difficult or won’t start at all. If the engine does not turn over at all, then there may be a problem with your ignition system. This would indicate the problem probably lies somewhere else (fuel, carburetor, valves, etc.). If the engine tries to turn over (even for a second) and dies, then you have spark. MAXIMUM) and re-attach the spark plug lead. Step 6: If it seems in working order, replace the plug, taking care not to over-tighten (15 ft.Step 5: Check the spark plug gap and adjust as necessary.If any of these conditions exists, replace the spark plug. Step 4: Inspect the spark plug for very stubborn deposits, or for cracked porcelain or electrodes that have been burned away.Step 3: Clean light deposits from the plug with a wire brush and spray-on plug cleaner.Step 2: Remove the spark plug using a spark plug socket. ![]() Then, clean the area around the spark plug to avoid getting debris in the combustion chamber when you remove the plug.
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