The electrode gap of a spark plug dictates the spark magnitude. After completing an application search and selecting a spark plug, the “vehicle information” section on the product detail page should display the proper gap setting for your engine. Think of a worn out spark plug gap like an old leaky water hose that requires more water pressure, and is like a restricting the flow at the end with your finger. Correct way to check, set and adjust your spark plug gap. ��, However running a large gap in high cylinder pressure application (which makes it very hard for spark to occur), will demand such a high voltage (electrical pressure) for spark to jump the spark plug gap, that the spark will find an easier way to the ground, possibly where the igniton wire is close to the ground (engine block etc...) or inside of distributor cap, inside of the ignition coil, on the outside of the spark plug (between the plug and the boot) etc... ��In either way the spark will not occur between the spark plug electrodes inside the combustion chamber, and engine misfire will occur. For Champion spark plugs it is a little less logical and is as listed below:��, 4 = 1.0mm (e.g. NGK has been developing spark plugs for every type of automotive engine, plus motorcycles, marine, horticultural, plant and many others since the 1930s. 25 1969 - 1976 J4C .030 25 1977 QL77JC4 or QL82C .030 20, 25, 28, 30 1978 - 2001 QL77JC4 or L78V or QL82C .030 25, 30 2003 & newer QL77JC4 .030 25 Commercial 1981 - 2001 QL16V or L16V Surface Gap Do NGK Iridium plugs need to be gapped? Useful hint: print the image and hang it in your garage! ��, Generally the applications with low cylinder pressures (low compression ratio) running lean A/F (Air/Fuel) mixtures have large recommended gap (around .050"), and applications with high cylinder pressures (high compression, forced induction - turbo, supercharged, nitrous applications,...) require spark plug gap smaller than .032". These NGK spark plug charts explain how NGK's numbering system works. There are three spark plug thread sizes currently being used in motorcycles and ATVs. By adjusting this distance you are sad to be ‘gapping your spark plugs’. ��This robs available voltage at the spark plug gap, ��as it "leaks" through the low resistance carbon deposits to the ground, resulting in a weak spark. ��They can not be further from the truth! ��CD ignitions have very fast Voltage rise (short rise time) and therefore they also work very well with spark plugs that have high capacitance, such a spark plugs with multiple gaps and/or surface discharge spark plugs. THIS CROSS REFERENCE TABLE IS INFORMATIVE ONLY. ��This is calculated as a % of misfire. The NGK Spark Plug Chart Explains All. The very most important rule when checking or adjusting spark plug gap is, to never pry, apply or exert any force on the spark plug center electrode, or center electrode ceramic insulator. Browse the chart to find the spark plug gap you need, then choose the corresponding model. For your engine to perform at optimum, the spark plugs in play should have the necessary spacing. ��Used spark plugs are hard to fire as the gaps are worn out, and insulation properties of the ceramic is compromised by solid combustion deposits and old fuel saturation. A spark plug part number might fit hundreds of different engines from many different manufacturers. If the threaded portion is slightly longer, spark plug indexing washers can be used to obtain the desired spark plug reach. Finding the Spark Plug on Your Engine Use the Spark Plug Gap Chart to Find the Right … Product linkage to vehicles or equipment from this publication are considered under normal conditions of use, fitted by a professional. How to Change Spark Plugs - Spark plug Gap setting and Gap cross reference chart. An incorrect electrode gap may affect engine performance as the spark magnitude may be insufficient to. We sell high quality NGK Spark Plugs for Stihl Equipment and other replacement parts online. The first letter of the NGK spark plug code (in this case a “D”) indicates the thread size of the spark plug. Hotter plugs are listed above the colder plugs. In the case of engine power output enhancement by means of additional modifications it is suitable to contact a producer's representative. Almost each and every spark plug comes in different HEX size. ��The force should be applied ONLY on the spark ��plug ground electrode strap moving it closer or further away from the spark plug center electrode. NGK have over 80 years of experience in spark plug manufacturing and we are a world leader in spark plug technology. DUE TO DIFFERENCES IN DESIGN AND MATERIALS THE SPARK PLUGS OF VARIOUS MANUFACTURERS DO NOT HAVE EXACTLY THE SAME HEAT RANGE. Please refer to our application listings for full details. we have found that the surface-gap plugs, while lasting longer, seem to have a slight performance hit over the standard plugs. 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