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Thread: Time to change plugs

  1. #11
    STOC #687 dwalby's Avatar
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    Re: Time to change plugs

    Quote Originally Posted by Kevin_56 View Post
    My unit auto ranges, so I am not sure of the reading.
    Quote Originally Posted by Kevin_56 View Post
    Measured with a Fluke 23 DMM.
    If its like any other Fluke I'm familiar with, next to the Ω character in the display there are small 'k' and 'M' icons that indicate which range its in.

  2. #12
    etalors's Avatar
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    Re: Time to change plugs

    [QUOTE=Kevin_56;2053058]It has been 102,000 miles since my last plug change. I put Iridium plug in back in 2010. I am now changing them at 102+ K.

    This is the first time I have removed them since installing them. Yes they are showing signs of use, but no where near as I expected.

    Did they give any problems during removal. Considering they have been there for seven years and 100K miles. And did you put any anti seize at the time of installation.

  3. #13
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    Re: Time to change plugs

    Quote Originally Posted by etalors View Post
    Did they give any problems during removal. Considering they have been there for seven years and 100K miles. And did you put any anti seize at the time of installation.
    No problem at all when I removed them from a stone cold engine

    Absolutely NO Anti-Seize on old plugs or the new ones. Turned till the gasket contacted, then 1/2 turn per box illustration.
    Kevin Elliott

    2003 ST1300
    STOC # 6495
    IBA # 39340

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  5. #14
    st1300doug's Avatar
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    Re: Time to change plugs

    I have 78,800 on mine now. Bike runs perfect and a routine 43-44 MPG. Should I leave'em alone?

  6. #15
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    Re: Time to change plugs

    Quote Originally Posted by st1300doug View Post
    Should I leave'em alone?
    Your bike, your call. There was nothing wrong with how mine was running either. I got my moneys worth. Mark brought up a good question on the resistance through the plug.

    I will be the first to admit, I did not look up his thread on the good, bad or ugly on the resistance deteriorating. No idea of how much is too much drop.

    Mark - chime in please.

  7. #16
    Natural Rider Enhancement Blrfl's Avatar
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    Re: Time to change plugs

    Quote Originally Posted by Kevin_56 View Post
    I will be the first to admit, I did not look up his thread on the good, bad or ugly on the resistance deteriorating. No idea of how much is too much drop.

    Mark - chime in please.
    The TL;DR on that thread was that the resistors deteriorate over time but I have no idea how much deterioration would let enough noise leak into the electrical system to cause problems. Resistors in general have tolerances of up to 20% depending on the application. I can't imagine the resistors in spark plugs are particularly tight in that department, which makes the 15% you saw seem reasonable.

    The bigger thing with the replacement interval is electrode wear. Iridium and platinum electrodes will last a lot longer, and I'd assume the manufacturers put resistors in those plugs that will survive the recommended lifetime. The OEM plugs have nickel electrodes and should probably be replaced on the recommended schedule for that reason.

    --Mark
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  8. #17
    Site Supporter Soontobeone's Avatar
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    Re: Time to change plugs

    Quote Originally Posted by st1300doug View Post
    I have 78,800 on mine now. Bike runs perfect and a routine 43-44 MPG. Should I leave'em alone?
    To my great surprise, NGK makes two versions of the Iridium spark plug. One is an OEM plug, the other is an aftermarket plug. The difference? The OEM plug uses two precious metals (electrode and seat), while the aftermarket plug uses one precious metal (electrode only). The result is, the OEM is designed to go up 100k miles. The aftermarket plug up to 50k miles.

    https://www.ngksparkplugs.com/about-...and-iridium-ix

  9. #18
    Site Supporter Don B's Avatar
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    Re: Time to change plugs

    Quote Originally Posted by Kevin_56 View Post
    Absolutely NO Anti-Seize on old plugs or the new ones. Turned till the gasket contacted, then 1/2 turn per box illustration.
    To the best of my knowledge. anti-seize is not necessary nor recommended on the "current crop" of spark plugs. I can't recall ever using it on plugs.
    https://www.ngksparkplugs.com/about-...t-spark-plugs#!

    The Older I Get ... The Better I Was

    '03 ST1300A (The one with the faST black wheels)

  10. #19
    st1300doug's Avatar
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    Re: Time to change plugs

    Good news on the 'anti-seize' info. & the OEM vs the 'other' plugs. Thanks!

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