Maintenance. Plug images are located on the opposite page. Stock No. Because the spark plug is inside the engine and is the only easily removable part it can be used as an indicator to the state of tune and condition … This applies to standard copper and platinum plugs. An IATF 16949:2016 & ISO 9001:2015 Certified, An ISO 14001:2015 & ISO 45001:2018 certified Co. Normal rates of gap growth are as follows: Four-Stroke Engines: 0.01~0.02 mm/1,000 km (0.00063~0.000126 inches/1,000 miles) Two-Stroke Engines: 0.02~0.04 mm/1,000 km (0.000126~0.00252 inches/1,000 miles). NGK Racing NGK Standard Part No. Certainly, An engine’s condition can be judged by the appearance of the spark plug firing end. Correct heat range for engine and operating conditions. Ignition system problems causing a weak or intermittent spark. Typical lead erosion causes the surface of the ground electrode to become thinner, and the tip of the electrode looks as if it has been chipped. Spark plugs usually require voltage in excess of 20,000 volts to 'fire' properly. Oil - Lubrication. %PDF-1.6 %���� The material of the electrodes has oxidized, and when the oxidation is heavy, it will be green on the surface. Lead fouling usually appears as yellowish brown deposits on the insulator nose. You will likely see one of the following conditions. Autolite spark plug heat range is generally indicated by the last digit of the part number. A worn spark plug not only wastes fuel but also strains the whole ignition system because the expanded gap (due to erosion) requires higher voltages. NGK High-Ignitability Spark Plugs - 2W The new generation NGK spark plug MR7C-9N uses a special metal alloy to enhance its performance. To read a spark plug and assess engine troubles, you first have to remove it. As a result, the spark plug is functioning optimally. Repairs. Check for correct application and spec/measurements. Once you get the socket over the spark plug, place your hand over the head of the wrench, grasping the head firmly and pull the handle, hitting it … .d�-E“-����~����n��R�m'h� �f�_����l(E��b�ֲ�*��4:b�`�2�L^��-nH���FS~�� 7��!���$�ҡ�r� �m��q�a��E�&����>㯼8� e����n�|�P��G4��7�%�d��N��M�s endstream endobj 12 0 obj <>>>/Filter/Standard/Length 128/O(y�1��+�F��̑��Κmf�4�|��4)/P -1340/R 4/StmF/StdCF/StrF/StdCF/U(8��=�4���]�Z�9� )/V 4>> endobj 13 0 obj <>>> endobj 14 0 obj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text]>>/Rotate 0/TrimBox[0.0 0.0 612.0 792.0]/Type/Page>> endobj 15 0 obj <>stream Spark plug heat range is the measure of how fast the spark plug tip dissipates combustion heat. Normal spark plug NGK Spark Plug Specification Chart 60 Spark plug charts are sorted by thread size, thread reach, hex size. Heat Range: Heat Range = Ground Strap, the ground strap indicates the heat-range of the spark plug.If the "color" of the ground strap "changes" too close to the ground strap's end, (which is above the center electrode), then the heat-range is "too cold" , meaning that the strap is losing heat too quickly to the base ring, and is not able to burn off deposits until near its end. 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. Carburators. Recommendations: When new spark plugs are installed, replace with plugs of the same heat range. Riding. The spark plug Cross references are for general reference only. Look at end of the spark plug that was in the cylinder and examine it. This video describes in detail the best process to examine a spark plug and assess its condition. Image Part No. NGK SPARK PLUG prides itself on providing cutting-edge products, first-class expertise and technical know-how related to spark plugs, glow plugs, ignition coils and leads, oxygen, temperature, NOx and MAP/MAF sensors. Spark plugs with resistance value outside the specified should be replaced – Visual analysis: Through consultation of the NGK engine failures diagnosis newsletter, check out the condition of the spark plugs burning. Normal Condition. Spark plug heat range is too cold for the operating conditions. Standard style Spark Plug *NGK Spark Plugs are designed to OEM requirements and as such, a variant of each of the above styles may not be available as it may not be an OEM requirement. So, If the firing is brown or light gray, the condition can be judged as good. Spark Plug Cross Reference Chart:: part 1 - NGK spark plugs, Denso, Autolite, Champion, Motorcraft. Brakes. If the firing end of a spark plug is brown or light gray, the condition can be judged to be good and the spark plug is functioning optimally. To contact them, click here. The world leader in spark plug technology for over 80 years. �+.Θ �Eq ����3Ѕ�������t�K� ��| endstream endobj startxref 0 %%EOF 62 0 obj <>stream Home: XS11 Info. The following symptoms or conditions may have an … Lead erosion is caused by lead compounds in the gasoline which react chemically with the material of the electrodes (nickel alloy) as high temperatures; crystal of nickel alloy fall off because of the lead compounds permeating and separating the grain boundary of the nickel alloy. Abnormal electrode erosion is caused by the effects of corrosion, oxidation and reaction with lead—all resulting in abnormal gap growth. Bosch and AC-Delco. Air/fuel mixture is too rich, the carburetor settings are incorrect. Dry: Black Soot Buildup . 11 0 obj <> endobj 37 0 obj <>/Encrypt 12 0 R/Filter/FlateDecode/ID[<8EC06C7D21E64D978D23EB7C6BFBFA40><817B128E3C1B443BAFB54C14BF48AB3D>]/Index[11 52]/Info 10 0 R/Length 117/Prev 222916/Root 13 0 R/Size 63/Type/XRef/W[1 3 1]>>stream Part# NGK STK # NGK # 44 3510 B6S 41-963 7740 PTR5C-13 45FFS 6222 BPR5HS 45 3210 B4 41-965 2467 PTR5A-13 45L 3112 B4L We are not NGK Spark Plugs USA. If the deposits are wet, it can be an indication of a breached head gasket, poor oil control from ring or valvetrain problems or an extremely rich condition—depending on the nature of the liquid present at the firing tip. Dry and Wet Fouling Although there are many different cases, if the insulation resistance between the center electrode and the shell is over 10 ohms, the engine can be started normally. Follow these instructions on how to remove a spark plug. NGK Spark Plug Numbering System ... View full size version of NGK premium plug numbering chart. Our technical support is an integral part of the many services we provide. Hotter plugs are listed above the colder plugs. ɏ�}`Q����Ь�U�w��?�I8��}:`���n�`愷���1����a@�q4�r/ye��)y�g��ӡG���lE��!V��%�(@��R,�k���S3�fّ��Ј�/�y�#����r��>(�����:�qkx� K�PL������~f�Ͷ��O =�. There are additional decodes available for NGK US specification plugs. Those formed at 370-470°C (700-790°F) have the greatest influence on lead resistance. ... do get a new set of Autolite plugs. Being able to “read” a spark plug can be a valuable tuning aid. Modifications. Although there are many different cases, if the insulation resistance between the center electrode and the shell is over 10 ohms, the engine can be started normally. Part# NGK STK # NGK # Comp. Below is NGK's spark plug part number decode. Dark coloring, such as heavy black wet or dry deposits, can indicate an overly rich condition, too cold a heat range spark plug, a possible vacuum leak, low compression, overly retarded timing or too large a plug gap. The melting point of nickel alloy is 1,200~1,300°C (2,200~2,400°F). (Engine temperature can affect the spark plug’s operating temperature, but not the spark plug’s heat range). NGK SPARK PLUGS - MOTORCYCLE APPLICATIONS cc Model Year Regular Premium Plug Gap cc Model Year Regular Premium Plug Gap 490 YZ490 88-90 BR8ES BR8EIX 0.032 490 YZ490 82-87 --- BR8EIX 0.024 500 SC500 73-74 BR8ES BR8EIX 0.024 500 SR500 80-81 BPR6ES BPR6EIX 0.032 500 SR500 78-79 BPR7ES BPR7EIX 0.032 500 TT500 76-81 BPR7ES BPR7EIX 0.032 < Prev Next > Main Menu. With a deeper analysis, a spark plug can be cut open to look at the porcelain down deep into the housing. NGK Resistor Caps The cover body is made of sturdy phenolic resin that endures high heat and high tension. Below is a list of some of the possible external influences on a spark plug’s operating temperatures. On how to remove a spark plug heat range may have an … Normal symptoms brown. Traced quickly to prevent further deterioration of performance and possible engine damage into the housing and tension. The NGK spark plug via the NGK spark plug condition you first have to remove a spark plug the. Judged as good fouling or excessive heat must be traced quickly to prevent deterioration! Digit of the electrodes is also fretted and rough Please note that the Service life provided. Of NGK premium plug Numbering chart 's spark plug condition – What They Tell you 1 for! Influences on a new set of Autolite plugs or conditions may have an … Normal symptoms brown... The ionized gas becomes a conductor and allow electrons to flow across the gap to “ ”. With a deeper analysis, a spark plug and assess its condition the operating.! Vary due to vehicle driving conditions surface of the part number decode too rich, electrode... Lead—All resulting in abnormal gap growth to recommendation section for specific engine applications Comp ask for a spark technology. 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