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spark plug heat ranges

Discussion in 'XJ Technical Chat' started by Maxim700, May 18, 2006.

  1. Maxim700

    Maxim700 Member

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    Does anyone use a hotter plug than spec?

    I just checked my bike and the plugs are 1 heat range hotter than the manual calls for.
    is this a common practice for these bikes as they get older?

    The plugs look good but are light grey/white as compared to light tan.
     
    Maxim700, May 18, 2006
    #1
  2. Robert

    Robert Active Member

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    I've run NGK BP8ES with no issues and a good burn. I wouldn't feel comfortable going any higher. I ran them because they were all that was available where I got stuck. I went back to the 7's just as soon as the next change came up (wisely, I chose to save up for the new ones ahead of time).
     
    Robert, May 18, 2006
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  3. Maxim700

    Maxim700 Member

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    Isn't an 8 cooler than a 7? I went to the NGK web site and the example they have is 2 hot 4 cold.

    My manual calls for BPR8ES but there are BPR7ES in the bike.
     
    Maxim700, May 18, 2006
    #3
  4. Robert

    Robert Active Member

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    My 81 650 XJ runs 7's, I don't know what you X'ers use. Sorry.
     
    Robert, May 18, 2006
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  5. Maxim700

    Maxim700 Member

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    actually a non X 2 valve per 700.
     
    Maxim700, May 18, 2006
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  6. aussie_xj

    aussie_xj New Member

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    I pulled mine out to be replaced. I checked the manual and it said to used BP7ES, the ones in the bike were a BP5.

    I am buggered why a much hotter plug was being used. and I could only get a 6 at the time. Maybe I should find a 7
     
    aussie_xj, May 19, 2006
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  7. faighaigh

    faighaigh Member

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    Morning.

    I had BP7ES's in my xj700 when I bought her but according to my manual they should be 8ES's. On the rare occassion the bloody bike runs
    she seems happy enough with the plugs.

    Faighaigh.
     
    faighaigh, May 19, 2006
    #7
  8. secaman

    secaman Member

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    i use 7 as per manual

    but it is really hot here

    i might try 8's

    to see if it wont over rev!
     
    secaman, May 19, 2006
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