Plugs are ideally suited to engine, engine probably in good condition. If you are experiencing engine problems, taking a look at your spark plugs is a good place to start. So, if your vehicle has a little less spunk lately; it might be time to change your spark plugs. Spark plugs are one of the most misunderstood components of an engine. This guide was designed to assist the technician, hobbyist, or race mechanic in understanding, using, and troubleshooting spark plugs. Spark Plug Reading 101 (Gas) Detailed Plug Pictures page. In short, the reading of a spark plug involves evaluating the condition and color of the tip of the spark plug. Engine and spark plug manufacturers will publish information about the characteristic markings in spark plug reading charts. This website uses cookies to improve your experience while you navigate through the website. 4 Too Cold. 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. Spark plug construction. ! Coupling what you see in the spark plugs with other symptoms can help establish the engine’s current state. Have you ever wondered how to "read" a spark plug? Reading Spark Plugs by Mike Chilando. 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. NGK lists a design symbols chart in the front of every spark plug catalog. 18 Good. Spark plug readings from then on were quite even across all eight cylinders and similar to those of straight methanol. Reading Spark Plugs. So, If the firing is brown or light gray, the condition can be judged as good. The ultra-fine wire iridium center electrode pin delivers best performance. 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. Comments. 6 Cold or Rich But OK. 7 Cold or Rich But OK. 8 Cold or Rich But OK. 9 Good. Cycle World Technical Editor Kevin Cameron answers your motorcycle engineering and mechanical questions. 15 Best. 17 Best. This is how your plugs should look after they've been used for a few miles. Unlock the performance in your engine with Bosch Iridium 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. 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. Thanks to Larry Meaux of Meaux Racing for providing this information and pictures. Now, I’m going to cover the 3 most common conditions, lean, normal, and rich. 23 Hot or Lean But OK (?) 3 Carbon Fouled. How to Read Spark Plugs to Diagnose Engine Troubles . Here, R5671A represents the plug type and -11 represents the heat range. 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. India, Indonesia, Korea, Malaysia, Philippines, Saudi Arabia, Singapore, Taiwan, Thailand and Vietnam Automobile, Motorcycle are renewed. 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. The exception to this is racing plugs. 2019.2.22 "Find Your Plugs" is updated. Serviceable Spark Plug Resistance. White, no color on spark plug: Too lean. 13 Real Good. 21 Kinda Hot But OK. 22 Hot or Lean But OK (?) Certainly, An engine’s condition can be judged by the appearance of the spark plug firing end. Heavy deposits . A clean, white insulator firing tip and/or excessive electrode erosion indicates this spark plug condition. 11 Good. October 30, 2017. For new plugs, we recommend 4000 ohms as the maximum acceptable value. Reading spark plugs is an easy way to determine how an engine is running. [R] Resistor - If an R is present, this indicates a resistor type spark plug. Normal . 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 you should check your plug often. 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. Shop Aircraft Spark Plugs The stock number is 6596. Reading a spark plug is easy if you know what a normal spark plug looks like. 12 Good. 19 Good. Three Parts to the Spark Plug. ... there is no cut and dried chart showing exactly what your engine needs. However, ... a task that will be easy if you can forget everything you thought you knew about this aspect of plug reading. The top of a new spark plug is covered in white ceramic insulation. Nice, grey-brown deposits, lightly coated core nose. 2. Bosch Iridium Spark Plugs are engineered to deliver both high performance and long life, representing advanced OE spark plug technology. [V] Shell Design - This refers to the thread size and reach of the spark plug. Any resistance at all would mean the plug is bad. Spark plug heat range is the measure of how fast the spark plug tip dissipates combustion heat. Reading Spark Plugs. Here’s some quick references to reading a motorcycle spark plug: Light tan spark plug: Good mixture. Reading spark plugs can also give you an early insight into any problem that may be just beginning to rear its ugly head. Spark plug manufacturers have solved the problem by leaving an unthreaded relief at plugs' lower ends. 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. 1 Oil Fouled. Iridium Spark Plugs . By "reading" the color of the plug you can tell a lot of things about how the engine is running. 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). Tis the season for tune-ups, my friends! 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 !! Spark Plug – How Do I Read My Spark Plug Condition – What They Tell You 1. Spark Plug Reading Discussion going on in our message board. Normal Condition. Sources: How Automobile Ignition Systems Work – howstuffworks; How to Read a Spark Plug – wikiHow; Share. 5 Too Cold. SPARK PLUG CATALOG ASIA OCEANIA VERSION 2020 is updated. Reading a spark plug consists of examining and evaluating the condition and color of the tip of the plug. 16 Best. Dry and Wet Fouling. 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 ! 2019.2.1 SPARK PLUG CATALOG ASIA OCEANIA VERSION 2018 is updated. How Do You Read A Motorcycle Spark Plug? Numerous questions have surfaced over the years, leaving many people confused. 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. Knowing how to read spark plugs can help you identify potential engine-related malfunctions early on and save you expensive repairs. 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. 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 Resistor type spark plugs reduce the amount of radio frequency interference (RFI) that can cause ignition misfires and static on the radio. 20 Good. Or if you are on the dyno; VALID ONLY for full load acceleration or steady state dyno tests Good running conditions: If everything is good, the spark plug should have a tan/light brown color. Spark Plugs . Your spark plug condition not only can tell you if it’s time for replacement, but can speak volumes about the engine as well. By Kevin Cameron. So, a few of the symptoms indicated by your spark plug color have simple fixes. A good spark plug should show an open circuit between the center electrode and the tip. Spark plugs can provide valuable information about your vehicle’s performance and can predict potential problems. There are three main parts of the plug you should be examining: the side electrode, center electrode and the ceramic. The spark plug color can provide evidence of what is happening inside the engine. For a two-stroke engine, having a fresh spark plug is incredibly important. 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.. DPR5EA-9 is the plug number and 2887 is the stock number. Cancel reply. Published February 26, 2015. 14 The Best. 10 Good. This video describes in detail the best process to examine a spark plug and assess its condition. We did not see this porcelain sensitivity on straight methanol mixtures. 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). 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”. 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. 2 Oil Fouled. ... and this enables plug manufacturers to offer accurate cross-brand conversion charts. As a result, the spark plug is functioning optimally. Dark brown or Black Spark Plug: Too rich; Black, oily Spark Plug: Oil fouled (see valves or piston rings.) Starting with the center electrode, it should be the same color as a … Additional Resources. Additional Spark Plug Related Resources. Embed. To cover the 3 most common conditions, lean, normal, and troubleshooting spark plugs are engineered deliver... Plug firing end things about how the engine is running is easy if you know what a normal spark –... 2019.2.1 spark plug reading incredibly important Iridium spark plugs with other symptoms can help you identify potential engine-related early... Good, the spark plug involves evaluating the condition and color of symptoms. How to Read spark plugs are ideally suited to engine, engine probably in good condition is happening inside engine. And long life, representing advanced OE spark plug reading 101 ( Gas ) Detailed plug pictures page judged good! Do I Read My spark plug – how Do I Read My spark plug – wikiHow ;.... ’ s some quick references to reading a spark plug using, and Rich should show open! 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