![]() ![]() This is just the same as a bad spark plug or a broken cable. ![]() Well, if you pull the cord and the spark plug isn’t grounded to the mower’s engine, the coil begins to overheat. Most of us, at some point, have removed the spark plug from the mower and pulled the starter cord to see if it’s working ok. Do you think it’s a good idea to test a spark plug that is attached to your lawn mower without it being grounded? Definitely not. If the cable is damaged or broken, the charge will back up in the coil and form the same heat damage. Just like the overheating problems a spark plug can cause, a cable can do the same. However, you do need to be aware of cable damage. Fortunately, you don’t need to worry about a mix-up these days. Before, it was possible to get the wrong combination and mess up your coil. Now, some years back, you would buy a coil and cable separately, but nowadays, they come as one item. Time for the spark plug cable to step in. This electron charge needs somewhere to go, so it heads for the spark plug. The reaction between the protons and the neutrons inside the coil produces an electron, the charge. Once again, the coil produces more charge, more heat and burns itself out. A wrong spark plug is the same as an over-gapped plug and a faulty plug. So, if you have the wrong spark plug, the charge can’t pass the electrode. This electrode is designed with a specific resistance. What happens if you use the wrong spark plug? Well, inside the spark plug is an electrode that the current reaches before it arcs to the ground. But just because it fits doesn’t mean it’s the right one. Well, you’ll find that you can buy a spark plug that both fits into your lawn mower and that connects to the ignition cable/spark plug cable. If you’re sitting there wondering, “why does my ignition coil keep burning out” it could be because you’re using the wrong spark plug. Yep, I’m afraid we’re still talking about spark plugs, but this is the last one. The coil is going to overheat because it is not able to discharge. ![]() A bad spark plug is going to have the same effect as a poorly gapped spark plug. Other than over-gapping the spark plug, you might have a bad spark plug that needs changing. So, if your spark plug is over-gapped, your coil is going to quickly burn out. The one thing that the coil can’t handle is extra heat. The result is the coil produces more current and more heat. Unfortunately, the coil isn’t designed to do this. This makes the coil think that more current is needed, so it increases the charge. Now, if the gap is too big and the sparkplug is over-gapped, the arc can’t happen. So, once the charge gets to the end of the spark plug, it needs to arc over the gap. The spark plug on your lawn mower is basically a grounding point that this charge is attracted to. The charge that is created in the coil needs a method to discharge itself so that it can continue to process and make more charge safely. These changes lead to a burned out ignition coil. The final result is a change in the amount of charge created and the time of release. So, if your lawn mower is low on oil or has a problem with cooling, then it’s probably overheating The result is the insulation loses its integrity, and the copper winding arcs back on itself. Consequently, the insulation is not rated to take the added heat of an overheating engine. Now, this insulation is rated to cope with the reaction heat and the heat of the engine. To make sure the windings can cope with the heat, the copper winding is insulated to make sure that the single wire of the winding never touches itself. Overheating of the Engine & Coilĭuring the reaction inside the coil, a fair amount of heat is generated on the copper windings. So, let’s take a look at what causes an ignition coil to go bad. As soon as conditions for this reaction change to less than ideal, the coil suffers. Every time the magnet attached to the flywheel passes the coil, there is a complex reaction between the iron core, the copper winding, and the magnet that produces an electrical charge. What Makes a Lawn Mower Coil Go Bad (6 Possible Causes)Ī lawn mower coil is made up of an iron core and copper winding tucked neatly inside the lawn mower’s ignition coil. Any one of these causes, or a combination of multiple causes, can lead to your lawn mower coil failing. The most common causes of repeated ignition coil failure are engine overheating, defective coil components such as spark plugs and cables, using incorrect parts, and poor maintenance methods. 4.6 Using the Mower’s Off Switch What Causes Repeated Ignition Coil Failure? (The Short Answer) ![]()
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