![]() This problem here can be caused by a wet or speckled spark plug. Your engine might cut off midway or you’re not getting any throttle response from the outboard. Then gently clean the black-colored residual carbon from it. To clean it up, take a brush that has soft wires. If you are facing this symptom we have just explained, then you need to clean it. So, you have trouble starting the engine. ![]() These reasons result in the engine not having enough power to start. And a possibility of a vacuum leak or the spark plug gap being too high. This indicates that the engine is operating on low heat and low compression. Then if you visibly check the plug, you will see it has carbon residue. Trouble Starting The EngineĪn engine that won’t start right away is the first sign of a failing spark plug. Here is a chart to make it simpler for you. Spark plug color and state can spill a lot about the condition of your boat engine. Always have an idea of how long do spark plugs last in an outboard.Īlso, check for visible signs. You need to regularly check for symptoms. If the spark plug is failing, it will affect your boat engine. To help you, we have gathered everything we could find about bad spark plugs. This information is pretty vague and probably not enough. For example, if it’s bright white it means your engine is overheating and losing power. The color of the spark plug can also tell a lot about your engine. And also loss of engine power decreased engine acceleration, etc. Symptoms include the engine not starting properly, and the engine cutting out. So, what are the symptoms of bad spark plugs outboard? It will help you take action beforehand and could also save you some trouble. It is very important to understand the symptoms. The spark plugs are screwed into the engine’s cylinder head, and they need to be periodically checked, cleaned, and replaced to ensure proper engine performance.Īre you facing some trouble with your boat engine? Among other things, it’s highly possible that your spark plug is causing the problem. Spark plugs consist of a center electrode, a ground electrode, and a ceramic insulator that isolates the two electrodes from each other. They provide the electrical spark necessary to ignite the fuel in the combustion chamber and power the motor. Having said that, some experienced mechanics still use anti-seize and some argue that no anti-seize recommendation is due to legal reasons and is to reduce or eliminate the liability of breakage (due to over-torquing) during installation.Spark plugs are an important component of the ignition system in outboard motors. If antiseize compounds come in contact with the core nose of the plugs, it can lead to a misfire condition."ĭoesn't seem like that heat transfer (or lack thereof) is a major concern. Antiseize compounds are typically composed of metallic, electrically conductive ingredients. "From Autolite: We do not recommend the use of any antiseize products for installing spark plugs. Anti-seize can alter the tightening torque up to 20%, increasing the risk of breakage." "The nickel coating on most modern spark plugs provides added protection from seizing in aluminum cylinder heads and has made anti-seize less important in spark plug installations. "NGK says their metal is a special material that will not stick to anything and no anti seize is recommended because of potential over-torquing." Re: Using Anti-seize or Oil on Spark Plug Threadsīut since you guys are talking about the subject.
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