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Spark Plug Meaning

Discussion in 'XJ Technical Chat' started by Kris Taylor, Feb 18, 2015.

  1. Kris Taylor

    Kris Taylor Member

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    Hey guys just in case you were wondering what the plug letters/numbers meant on NGK plugs here you go. I work at a small engine shop and we sell nothing but NGK plugs so we have to know our stuff. I don't know about other bikes but my bike an 81 XJ650 it runs an NGK plug BP7ES

    First Letter is Thread Dimensions/Hex. Size
    Letter B Means 14mm /13/16" (20.8mm)

    Second Letter is Construction
    Letter P means - Projecting Insulator Type

    The number is Heat Rating (heat rating goes on a scale of 2-11 the lower the number the hotter the higher the colder
    Number 7 as a rating of 7

    Next letter is Thread Reach
    Letter E thread reach is 19.0mm (3/4")

    Last Letter is Firing End Construction
    Letter S has a standard Type (2.5mm center electrode)


    I figured I would post this is anyone was interested in learning. It's always good to know, since I am normally the one asking all the questions.
     
    Kris Taylor, Feb 18, 2015
    #1
  2. MattiThundrrr

    MattiThundrrr Not a guru

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    Thanks for sharing your expertise!
     
    MattiThundrrr, Feb 18, 2015
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    jmilliken, hogfiddles and Kris Taylor like this.

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