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Alternative plugs for NGK BP7ES

Discussion in 'XJ Technical Chat' started by Melnic, Feb 10, 2024.

  1. Melnic

    Melnic Active Member

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    So, I had found a tune up kit for my 78 XS650 at a local shop that had been on the shelf for years.
    It was a Nippondenso kit and the plugs were Nippondenso W22EP-U
    I looked them over and they seemed to be the same size and also 0 ohm
    I did not put them in the XS, but when I got my recent 82 XJ650 and found 3 of the 4 plugs were bad, I used 2 of them in the bike. So far so good.
    They are easily obtainable in the US for a fair price ($20 for 8 on ebay)
    I have about 100 miles on the new bike now so will report later after I have more miles on them.
    Just posting cause they are an available alternative.
    I don't know how to find specs for plug temperature so if anyone can help with that , please post
     
  2. LAB3

    LAB3 Member

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    NGK plugs are the opposite of most plugs, a lower number is hotter. If you're using BP7ES and want a hotter spark you'd go to BP6ES.

    I've found it more and more difficult to find non-resistor NGK plugs the last few years and have converted my last three bikes to non-resistor caps and run resistor plugs, I can get them at pretty much any auto parts store at a reasonable price.

    These charts can tell you pretty much anything you need to know about the numbering system NGK uses, they have charts that cover caps too.

    https://www.ngk.com/ngk-spark-plug-numbering-systems

    https://www.ngk.com/ngk-spark-plug-resistor-cover-numbering-system
     
  3. Jetfixer

    Jetfixer Well-Known Member

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    I use Autolite Ap63 or 63 plugs easy to find .
     
  4. Dan Gardner

    Dan Gardner Well-Known Member Premium Member

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    It looks like those Autolites are also resistor plugs, so not exactly a direct replacement for BP7ES
     
  5. Melnic

    Melnic Active Member

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    FYI, the W22EP-U from nippondenso is 0 ohm (non resistor)
     
  6. LAB3

    LAB3 Member

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