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SPARK Plug NGK help.

Discussion in 'XJ Technical Chat' started by mrhuba, Apr 17, 2011.

  1. mrhuba

    mrhuba New Member

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    Ok, so Im in need of new Spark Plugs.
    The current NGK's on my bike are the cheapest ones that they make,or so I've read up on, the previous owner did not seem to mind.
    So I ride a 1985 XJ700 and the plugs on it are NGK BP8ES.

    What would you guys recommend me replace them with?
    I was thinking Iridium ones.
    Can someone point me in the direction?
     
    mrhuba, Apr 17, 2011
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  2. Ledicott96

    Ledicott96 Member

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    Those NGKS will do the job just get a new set, make sure thay are the right plugs in the manual. Iridiums are a good plug but there expensive to replace a think there just a slighly hoter plug but not hold me on that one.
     
    Ledicott96, Apr 17, 2011
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  3. feetballhabob

    feetballhabob Member

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    the manual says NGK D8EA or DENSO X24ES autolite has one the xs4163 looks like an iridium
     
    feetballhabob, Apr 24, 2011
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  4. Zookie400

    Zookie400 Active Member

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    i run the iridium plugs in my race machines, and they definitely last longer. as for performance gains....none big enough to be noticeable.

    the plug you are running is "cheap" but not inferior. its a good quality part, go ahead and keep running them.

    and iridium plugs are not hotter, if they are the same heat range....br9es is the same heat as the iridium b9eix for example.
     
    Zookie400, Apr 25, 2011
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  5. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    That's not correct for an "airhead" 700. The NGK D8EA is a 12mm plug; my 550s use them. It's probably correct for an "X" model, I believe they use the smaller plugs too.

    If your bike is an aircooled 700, the NGK BP8ES is the correct plug. They're not "cheapo" plugs, by any stretch; by that I mean not poor quality, not that they're expensive. They're not; but there's no reason to look for something "better."
     
    bigfitz52, Apr 26, 2011
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  6. feetballhabob

    feetballhabob Member

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    mine is a water head
     
    feetballhabob, Apr 26, 2011
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  7. Altus

    Altus Active Member

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    NGK plugs are excellent - I use them almost exclusively.
    They make several types though, so by "cheapest" the OP probably means they're just the 'standard' plugs.
    What you want to find are the 'G Power' plugs in BP8ES for your bike. Very similar design to the iridium plugs, but using a high-tensile platinum electrode -- they work very well for a good price.
     
    Altus, Apr 27, 2011
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  8. feetballhabob

    feetballhabob Member

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    will those BP8ES work for xj700x water cooled the ngk site only list D8EA for the xj700 MAXIM x
     
    feetballhabob, Apr 27, 2011
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  9. Altus

    Altus Active Member

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    No - the X's need a different plug than the non-X's.
    The BP8 plug for non-X is a 14mm plug, while the D8 is a 12mm plug.

    Here's a link to NGK's pdf sheet on how to decode the part numbers:
    NGK Spark Plug Part Numbers
     
    Altus, Apr 27, 2011
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