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Thread: Spark plug gaps

  1. #1
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    Default Spark plug gaps

    Do I need to adjust them if I just buy new plugs?
    GS1000G 1981

  2. #2
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    Yes, you should. They could have been damaged in transit
    1978 GS 1000 (since new)
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  3. #3
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    Quote Originally Posted by Big T View Post
    Yes, you should. They could have been damaged in transit
    Thank you for a consise answer.

    It appears getting the shims to meassure is easy, but what do I use to bend them if they are out of spec?

    I was thinking of these shims:

    GS1000G 1981

  4. #4
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    They're the proper feelers, and for setting the gaps you can buy a tool for it.
    Otoh, I've never used a special tool, just a small-bladed plain screwdriver to lever against the side shell and slightly force the outer electrode up - be careful to never put any force on the central electrode or ceramic insulator.
    To reduce the gap, simply tap something (another plug, screwdriver handle, small spanner, etc) against the outer electrode. Gently does it though, you don't want to go too far.

    https://www.championautoparts.com/Te...g-Gap-Tip.html


    https://www.gsparkplug.com/shop/spark-plug-gap-settings
    Last edited by Grimly; 07-01-2020 at 07:49 PM.
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  5. #5
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    Come on, where's the picture of the round gap gauge that has the little hook to bend the outer electrode in or out without pecking or prying on anything?
    1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

  6. #6
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    I have found them to always be quite close. THey (NGK anyway) are packaged with a little tube over the end that protects it.

    Any auto parts store has the gap checker / adjust tool for 2 - 3 - 4 bucks.
    Some have a different gap adjuster feature than this one.


    Had 850G for 14 years. Now have GK since 2005.
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  7. #7
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    I've always found them to be spot on so I don't bother to check them anymore.

  8. #8
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    Quote Originally Posted by Noreg View Post
    Do I need to adjust them if I just buy new plugs?
    depends on the plugs. I bet there is a Youtube video on this topic.

    https://www.zoro.com/gearwrench-spar...caAniaEALw_wcB
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  9. #9
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    I've got one of the round ones like Redman posted. It doesn't take much time and you'll know because you measured.

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