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  1. #1
    jasj's Avatar
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    Plug Colour/Color

    I just switched my plugs over to Denso Iridium IXU27.
    Noticed that my number one plug is very white almost furry and dry looking. Is this normal or doo I worry?

    These plugs have done about 50 hours
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  2. #2
    You are running lean. What mods do you have?

  3. #3
    R.I.P. 11's Avatar
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    That's not lean, that's SUPER LEAN, richen or you will enrich your dealer...

  4. #4
    jasj's Avatar
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    Ok, What do I do to stop this? I have no engine mods except the Riva intake!

  5. #5
    You just have a power filter? What kind of gas are you using?

  6. #6
    jasj's Avatar
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    Normally Super unleaded, or optimax. The best possible fuel, think its about 97octaine. But I think UK octaine rating could be different to US rateing.

  7. #7
    Site Admin Green Hulk's Avatar
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    The plugs look good to me

    Maybe instead of going back with stockers go with some Denso iridium IXU27's

  8. #8
    Check and see if your flame arrestor hasn't worked loose or has a gap seeping in more air. What is your medium grade rating?

  9. #9
    jasj's Avatar
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    Phew!!! Thanks Jerry. I have just put Denso iridiums in so will check them again after my next ride.

  10. #10
    R.I.P. 11's Avatar
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    Quote Originally Posted by jasj
    Normally Super unleaded, or optimax. The best possible fuel, think its about 97octaine. But I think UK octaine rating could be different to US rateing.
    97 Euro is not expressed like here in USA.

    HEre in USA we call "92" a gas that is 97 RON and 87 MON, using the R+M/2 method that gives you 97+87/2=92.

    Your 97 Euro gas is 97 RON, so roughly equivalent to US 92, do not use any less than that.

    Don't you brits have 98 RON gas?

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