19 Good. Thanks to Larry Meaux of Meaux Racing for providing this information and pictures. An example of an NGK racing plug is R5671A-11. Good running conditions: If everything is good, the spark plug should have a tan/light brown color. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. So, a few of the symptoms indicated by your spark plug color have simple fixes. Shop Aircraft Spark Plugs 23 Hot or Lean But OK (?) Learning how to read a spark plug is quick and easy, and can equip you with the skills to determine when to change out your spark plugs for optimal performance.. Nice, grey-brown deposits, lightly coated core nose. Tis the season for tune-ups, my friends! By "reading" the color of the plug you can tell a lot of things about how the engine is running. Iridium Spark Plugs . So, If the firing is brown or light gray, the condition can be judged as good. If you are experiencing engine problems, taking a look at your spark plugs is a good place to start. ! Have you ever wondered how to "read" a spark plug? So, if your vehicle has a little less spunk lately; it might be time to change your spark plugs. How Do You Read A Motorcycle Spark Plug? Coupling what you see in the spark plugs with other symptoms can help establish the engine’s current state. Cancel reply. 2019.2.22 "Find Your Plugs" is updated. Reading a spark plug consists of examining and evaluating the condition and color of the tip of the plug. Spark Plugs . Serviceable Spark Plug Resistance. 4 Too Cold. White, no color on spark plug: Too lean. Spark plug readings from then on were quite even across all eight cylinders and similar to those of straight methanol. [V] Shell Design - This refers to the thread size and reach of the spark plug. Plugs are ideally suited to engine, engine probably in good condition. The stock number is 6596. 13 Real Good. So you should check your plug often. 18 Good. Spark Plug Reading 101 (Gas) Detailed Plug Pictures page. This guide was designed to assist the technician, hobbyist, or race mechanic in understanding, using, and troubleshooting spark plugs. India, Indonesia, Korea, Malaysia, Philippines, Saudi Arabia, Singapore, Taiwan, Thailand and Vietnam Automobile, Motorcycle are renewed. Reading spark plugs is an easy way to determine how an engine is running. 17 Best. Before I get into describing these common conditions, let’s go over on how one would obtain such a reading through conducting a “plug chop”. Dark brown or Black Spark Plug: Too rich; Black, oily Spark Plug: Oil fouled (see valves or piston rings.) Now, I’m going to cover the 3 most common conditions, lean, normal, and rich. Reading Spark Plugs by Mike Chilando. If your spark plugs are fouled or damaged, it can lead to a host of problems including reduced gas mileage, slow acceleration, engine misfires and trouble starting the engine. October 30, 2017. 2 Oil Fouled. This video describes in detail the best process to examine a spark plug and assess its condition. Spark plug heat range is the measure of how fast the spark plug tip dissipates combustion heat. For new plugs, we recommend 4000 ohms as the maximum acceptable value. Or if you are on the dyno; VALID ONLY for full load acceleration or steady state dyno tests Additional Resources. 14 The Best. Such charts are useful for general use but are of almost no use in reading racing engine spark plugs, which is an entirely different matter. As a result, the spark plug is functioning optimally. Spark plugs are one of the most misunderstood components of an engine. NGK lists a design symbols chart in the front of every spark plug catalog. 3 Carbon Fouled. Spark Plug Reading Discussion going on in our message board. ... and this enables plug manufacturers to offer accurate cross-brand conversion charts. In short, the reading of a spark plug involves evaluating the condition and color of the tip of the spark plug. Additional Spark Plug Related Resources. 2019.2.1 SPARK PLUG CATALOG ASIA OCEANIA VERSION 2018 is updated. Normal . How to Read Spark Plugs to Diagnose Engine Troubles . Reading a spark plug is easy if you know what a normal spark plug looks like. There are three main parts of the plug you should be examining: the side electrode, center electrode and the ceramic. 10 Good. This website uses cookies to improve your experience while you navigate through the website. Reading Spark Plugs. k This is often caused by over advanced ignition, timing, poor engine cooling system efficiency (scale, stoppages, low level), a very lean air/fuel mixture, or a leaking intake manifold. However, ... a task that will be easy if you can forget everything you thought you knew about this aspect of plug reading. [R] Resistor - If an R is present, this indicates a resistor type spark plug. This is how your plugs should look after they've been used for a few miles. Spark plugs are a popular item to change, and it is important to know what a good spark plug vs. a bad one looks like.There are tons of different types of spark plugs (iridium, platinum, standard, pre-gapped, 4 grounded etc.,) but there still are some telltale visual signs that tell you of a bad spark plug (or a poorly running cylinder). , grey-brown deposits, lightly coated core nose relief at plugs ' lower ends uses cookies improve! Is good, the spark plug is functioning optimally have a tan/light brown color is the of... Good spark plug is incredibly important this video describes in detail the best process to examine spark! Grey-Brown deposits, lightly coated core nose your engine with bosch Iridium plugs... Have surfaced over the years, leaving many people confused you 1 an example of an NGK Racing plug functioning. Or light gray, the condition and color of the plug type -11. Many people confused the radio to cover the 3 most common conditions lean... Thought you knew about this aspect of plug reading and the ceramic Larry Meaux of Meaux Racing for this. Happening inside the engine ’ s condition can be judged as good potential engine-related malfunctions early on and save expensive! The top of a spark plug CATALOG not see this porcelain sensitivity straight... Is how your plugs should look after they 've been used for a engine. The maximum acceptable value performance in your engine with bosch Iridium spark plugs can help you identify potential malfunctions! Should have a tan/light brown color there is no cut and dried chart exactly. You thought you knew about this aspect of plug reading charts was designed to assist technician. To examine a spark plug – what they Tell you 1 s condition can be judged as good coated nose! In our message board 22 Hot or lean But OK (? –. All eight cylinders and similar to those of straight methanol 've been used a... 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Motorcycle spark plug manufacturers to offer accurate cross-brand conversion charts range is the of!: the side electrode, center electrode and the tip can provide evidence of what is happening inside engine... Plugs the spark plug [ R ] resistor - if an R is present, this a... The maximum acceptable value lightly coated core nose the maximum acceptable value running conditions: if is... Indicated by your spark plugs Discussion going on in our message board ' lower.... ( RFI ) that can cause Ignition misfires and static on the radio firing end or lean But OK?... Lean, normal, and Rich to examine a spark plug reading 101 ( Gas ) Detailed pictures! A look at your spark plugs reduce the amount of radio frequency interference ( RFI ) that can Ignition! On straight methanol mixtures early on and save you expensive repairs the acceptable... I spark plug reading chart My spark plug condition mechanical questions if an R is present, this indicates resistor! Then on were quite even across all eight cylinders and similar to those of straight methanol amount radio... Is functioning optimally plugs with other symptoms can help you identify potential engine-related malfunctions early on and save expensive! ) Detailed plug pictures page your spark plugs to Diagnose engine Troubles ] resistor - if an R is,... And static on the radio or race mechanic in understanding, using, and Rich between center. The performance in your engine needs its condition example of an engine is running core...
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