High-quality spark plugs are very inexpensive and last a long time, so acquiring a new one should not be much trouble. This may be useful in a pinch, but we strongly recommend that you just replace the plug and save yourself the complications and hassle. Often, ATV users who encounter a flooded engine that will not allow their vehicle to start will remove the spark plug and use a torch and other tools to clean and dry off the spark plug’s exterior. You may be able to avoid draining the carburetor by simply replacing the wet, oily spark plug with a new dry one, however. If necessary, release the carburetor’s drain screw and allow the fuel to be drained. The engine is not given enough time to burn off the fuel, and it floods the engine. The most typical way this will occur is when the engine is started up and then immediately turned back off. In turn, this unburned fuel soaks the spark plug and makes it either not start at all or increases the difficulty of doing so. When we speak of a flooded engine, we refer to the process wherein unburned fuel sits in the engine. Engine FloodingĪnother common reason that an ATV’s spark plug may have been blackened is that it gets wet by way of engine flooding. Change your oil filter routinely as well. New and clean oil will begin to dissolve the built-up carbon, allowing it to be flushed through and trapped in the oil filter. Always check and change the engine oil frequently and when necessary. The leading cause of carbon buildup is more or less just a lack of upkeep and regular care. Carbon buildup is a buildup of crud that occurs in an engine’s air intake and exhaust systems.Įventually, this buildup of carbon begins to inhibit the airflow of the engine, making it, so the fuel/air mixture in the engine’s combustion system is overly rich with fuel.īecause electricity always seeks the path to the ground of least resistance, it may begin to bypass the spark plug in favor of the carbon deposits, effectively negating the spark plug and reducing the ATV’s engine’s performance as a whole. One of the things that happen in ATV engines is that the fuel mixture can become overly rich and lead to an excessive buildup of carbon. Here we will discuss possible causes and what to look for. There is no one size fits all blanket explanation for why your spark plug is charred, but based on its look, we can make some very safe assumptions and narrow down the root cause. Sometimes the spark plug may appear dry and white due to overheating, or it may appear corroded and rusted but for this article, we want to know what has caused your spark plug to go black. ![]() When there is a problem with your engine, the spark plug may give us some signs. Here’s a quick animation showing how a spark plug works in action: This is, of course, a very layman explanation of an incredibly complex process, but for the purpose of this article, a broad understanding will suffice.įor a more comprehensive explanation of a spark plug’s nuanced functions, see this article from. This process creates a miniature explosion, which then powers the engine and allows it to run. ![]() It does this by creating what is known as a “spark gap” wherein electricity produced by the engine’s ignition system tries to seek a ground pathway, and in doing so, arcs across from the ignition coil to the combustion chamber, creating a spark. The purpose of a spark plug is to create a spark and ignite the air/fuel mixture. How Do Spark Plugs Work?įor any combustion engine to function, the inclusion of working spark plugs is necessary. Finally, we will explain how to change a spark plug and how often this should be done. Next, we will go over what it means when your spark plug is black, as well as how to rectify the problem at its source. In this article, we will briefly explain how spark plugs work for anyone who is not sure. Overly rich fuel mixtures are almost always a result of carbon buildup, and an oil leak can be caused by bad O-rings, gaskets, pistons, or shotty valve guides. If your ATV spark plug is black, it is likely due to an overly rich fuel mixture, an oil leak, or because the engine has been flooded. During the course of inspecting and performing maintenance on your ATV, you may have noticed that one or all of the spark plugs is black. ![]() Spark plugs play a vital role in the performance of your ATV’s engine.
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