Spark Plug Reading 101 (Gas) Detailed Plug Pictures page. 17 Best. To help assure reliable and trouble free operations, Tempest recommends replacing spark plugs in service having a resistance value of more than 5000 ohms (5k ohms) or less than 500 (0.5k ohms). 2 Oil Fouled. Coupling what you see in the spark plugs with other symptoms can help establish the engine’s current state. This is only valid if you shut-off the engine after the finish line then tow the car back to the pits where you remove the plugs for reading !! Overall air/fuel ratio was rich, but because of fuel distribution problems, it was just not rich enough on a couple of cylinders to prevent porcelain failure with even low percentages of nitro. The stock number is 6596. The exception to this is racing plugs. As a result, the spark plug is functioning optimally. It must do this in a precise and controlled manner so the spark plug will: Stay cool enough to avoid pre-ignition and/or electrode destruction due to detonation. Iridium Spark Plugs . Engine and spark plug manufacturers will publish information about the characteristic markings in spark plug reading charts. How Do You Read A Motorcycle Spark Plug? So, if your vehicle has a little less spunk lately; it might be time to change your spark plugs. Here’s some quick references to reading a motorcycle spark plug: Light tan spark plug: Good mixture. Cycle World Technical Editor Kevin Cameron answers your motorcycle engineering and mechanical questions. 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.. Published February 26, 2015. 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”. Bosch Iridium Spark Plugs are engineered to deliver both high performance and long life, representing advanced OE spark plug technology. A clean, white insulator firing tip and/or excessive electrode erosion indicates this spark plug condition. 13 Real Good. 2019.2.22 "Find Your Plugs" is updated. DPR5EA-9 is the plug number and 2887 is the stock number. Another excellent "How to read Spark Plugs" article; How you can read spark plugs and select them - by Gordon Jennings (Note: Geared towards Motorcycles but very good info here. 15 Best. 6 Cold or Rich But OK. 7 Cold or Rich But OK. 8 Cold or Rich But OK. 9 Good. Spark Plug Reading Discussion going on in our message board. Additional Resources. 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. 2. Dark brown or Black Spark Plug: Too rich; Black, oily Spark Plug: Oil fouled (see valves or piston rings.) 12 Good. Nice, grey-brown deposits, lightly coated core nose. [R] Resistor - If an R is present, this indicates a resistor type spark plug. Spark Plug – How Do I Read My Spark Plug Condition – What They Tell You 1. 20 Good. Reading Spark Plugs. ! 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. Normal Condition. For a two-stroke engine, having a fresh spark plug is incredibly important. Starting with the center electrode, it should be the same color as a … So, If the firing is brown or light gray, the condition can be judged as good. Spark plug manufacturers have solved the problem by leaving an unthreaded relief at plugs' lower ends. 11 Good. The top of a new spark plug is covered in white ceramic insulation. Here, R5671A represents the plug type and -11 represents the heat range. Any resistance at all would mean the plug is bad. 18 Good. Normal . Have you ever wondered how to "read" a spark plug? 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. Reading Spark Plugs. Reading spark plugs is an easy way to determine how an engine is running. Plugs are ideally suited to engine, engine probably in good condition. So you should check your plug often. 19 Good. The ultra-fine wire iridium center electrode pin delivers best performance. 21 Kinda Hot But OK. 22 Hot or Lean But OK (?) 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. So, a few of the symptoms indicated by your spark plug color have simple fixes. Spark plug construction. Comments. In short, the reading of a spark plug involves evaluating the condition and color of the tip of the spark plug. 23 Hot or Lean But OK (?) By Kevin Cameron. 3 Carbon Fouled. A good spark plug should show an open circuit between the center electrode and the tip. This is only valid if you shut-off the engine after the finish line then tow the car back to the pits where you remove the plugs for reading ! Unlock the performance in your engine with Bosch Iridium Spark Plugs. 16 Best. Serviceable Spark Plug Resistance. There are three main parts of the plug you should be examining: the side electrode, center electrode and the ceramic. 5 Too Cold. Knowing how to read spark plugs can help you identify potential engine-related malfunctions early on and save you expensive repairs. Cancel reply. Sources: How Automobile Ignition Systems Work – howstuffworks; How to Read a Spark Plug – wikiHow; Share. Tis the season for tune-ups, my friends! 2019.2.1 SPARK PLUG CATALOG ASIA OCEANIA VERSION 2018 is updated. Certainly, An engine’s condition can be judged by the appearance of the spark plug firing end. Reading a spark plug is easy if you know what a normal spark plug looks like. This is how your plugs should look after they've been used for a few miles. Resistor type spark plugs reduce the amount of radio frequency interference (RFI) that can cause ignition misfires and static on the radio. NGK lists a design symbols chart in the front of every spark plug catalog. ... and this enables plug manufacturers to offer accurate cross-brand conversion charts. Spark plug readings from then on were quite even across all eight cylinders and similar to those of straight methanol. SPARK PLUG CATALOG ASIA OCEANIA VERSION 2020 is updated. Spark plugs are one of the most misunderstood components of an engine. Now, I’m going to cover the 3 most common conditions, lean, normal, and rich. Learn how to read a spark plug so you can know how your vehicle is performing, foresee potential problems and take care of them early, and have the knowledge of when to change your plugs for best performance. 4 Too Cold. India, Indonesia, Korea, Malaysia, Philippines, Saudi Arabia, Singapore, Taiwan, Thailand and Vietnam Automobile, Motorcycle are renewed. Good running conditions: If everything is good, the spark plug should have a tan/light brown color. 10 Good. Spark plugs are an often overlooked but crucial part of a race engine and focus on how spark plug tuning changes can squeeze out extra power - Circle Track Magazine Engine and spark plug manufacturers publish generic charts containing information about the characteristic appearance of spark plugs after being subjected to various normal and abnormal conditions. This guide was designed to assist the technician, hobbyist, or race mechanic in understanding, using, and troubleshooting spark plugs. Embed. Spark plugs can provide valuable information about your vehicle’s performance and can predict potential problems. 1 Oil Fouled. Dry and Wet Fouling. Reading a spark plug consists of examining and evaluating the condition and color of the tip of the plug. However, ... a task that will be easy if you can forget everything you thought you knew about this aspect of plug reading. For new plugs, we recommend 4000 ohms as the maximum acceptable value. If you are experiencing engine problems, taking a look at your spark plugs is a good place to start. The spark plug color can provide evidence of what is happening inside the engine. Or if you are on the dyno; VALID ONLY for full load acceleration or steady state dyno tests An Ohm meter, which is part of a multimeter, can only check a spark plug for a short circuit or a breakdown of insulation resistance. This video describes in detail the best process to examine a spark plug and assess its condition. [V] Shell Design - This refers to the thread size and reach of the spark plug. Spark Plug Reading 101 by Mike Canter, Last Updated Dec 19, 2014 Other than installing thermo-coupler sensors in the combustion chambers the only real way that you know what is happening inside your engine is to read the spark plugs. Shop Aircraft Spark Plugs 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). ... there is no cut and dried chart showing exactly what your engine needs. By "reading" the color of the plug you can tell a lot of things about how the engine is running. Your spark plug condition not only can tell you if it’s time for replacement, but can speak volumes about the engine as well. White, no color on spark plug: Too lean. Heavy deposits . How to Read Spark Plugs to Diagnose Engine Troubles . Reading spark plugs can also give you an early insight into any problem that may be just beginning to rear its ugly head. 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. This website uses cookies to improve your experience while you navigate through the website. Three Parts to the Spark Plug. Spark Plugs . Thanks to Larry Meaux of Meaux Racing for providing this information and pictures. We did not see this porcelain sensitivity on straight methanol mixtures. Spark plug heat range is the measure of how fast the spark plug tip dissipates combustion heat. An example of an NGK racing plug is R5671A-11. Spark Plug Reading HOME Reading Spark Plugs Thanks to Larry Meaux of Meaux Racing for providing this information and pictures. 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