Do you reuse your spark plugs?
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  1. #1
    PWCToday Regular guy48065's Avatar
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    Do you reuse your spark plugs?

    I change the plugs when it starts idling poorly & missing. For my casual use I can usually go all season--but I had to change them early this year after some unusually slow puttering around unfamiliar lakes.
    They are fouled but not worn. "Back in the day" every garage had a spark plug cleaner... Do you clean & reuse your plugs?
    96 & 97 1100Zxi

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    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Do you reuse your spark plugs?

    Yes, you can clean them with a brass wire wheel in a drill, then some brake parts cleaner. But a lot of times they are actually bad instead of just fouled. Test them with an ohm meter. From top to hex should read open....no continuity. From top to the electrode tip will be in the 4-5k range for a resistor plug. If it's good then yes, clean and reuse.
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    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Do you reuse your spark plugs?

    No timeline. A new spark plug can be fouled after 5 to 10min.
    Then they are trash. If you can clean them with spray carb
    cleaner great. But if there is a narrow fouled stripe hiding
    under the spark plugs bridge, it's toast.

    Those old spark plug cleaners were mini sand blasters. Using
    one opens the possibility for sand will to fall into the cylinder
    while the engine is running after a few heat cycles?

    Save spark plug cleaners for fork lifts.


    Bill M.

    Stay away from automotive spark plugs on 2 strokes.
    Last edited by wmazz; 07-25-2022 at 02:11 AM.
    Horsepower == Speed, RPM != Speed



  4. #4
    PWCToday Regular guy48065's Avatar
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    Re: Do you reuse your spark plugs?

    Quote Originally Posted by wmazz View Post

    Stay away from automotive spark plugs on 2 strokes.
    Explain?
    I use NGK BP9ES the manual specifies.
    96 & 97 1100Zxi

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    PWCToday.com Is My Home Away From Home
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    Re: Do you reuse your spark plugs?

    I used to change out my plugs all the time. But now that my skis are tuned correctly I haven't needed too. If I do happen to take a plug out for some reason i usually hit it with the wire wheel and carb cleaner. I also have the spark plug cleaner (mini sand blaster) but have only used it a couple times for the plug in my lawn mower.

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    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Do you reuse your spark plugs?

    Quote Originally Posted by guy48065 View Post
    Explain?
    I use NGK BP9ES the manual specifies.
    That one is an extended tip, and that tip diverts the fuel-air
    mixture as it loops through the combustion chamber. That
    causes a minor HP loss. Spark plugs like the Splitfire are
    worse.

    Indexing a BR8ES will make a slight increase.


    Bill M.

    On small low HP engines it is noticeable difference.
    Last edited by wmazz; 07-25-2022 at 12:39 PM.
    Horsepower == Speed, RPM != Speed



  7. #7
    PWCToday.com Is My Home Away From Home
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    Re: Do you reuse your spark plugs?

    Bunch of info on sparkplugs here: https://www.x-h2o.com/threads/spark-...rcraft.176504/

  8. #8
    I dream skis Jim_ii's Avatar
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    Re: Do you reuse your spark plugs?

    Quote Originally Posted by wmazz View Post
    That one is an extended tip, and that tip diverts the fuel-air
    mixture as it loops through the combustion chamber. That
    causes a minor HP loss. Spark plugs like the Splitfire are
    worse.

    Indexing a BR8ES will make a slight increase.


    Bill M.

    On small low HP engines it is noticeable difference.
    What does “indexing” mean? Never heard of that before.

  9. #9
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Do you reuse your spark plugs?

    For watercraft this can be some minor increases, but to
    some people it is worth the time to and effort.

    We use to race giant scale rc pylon racers with 8' to 12'
    wingspans and stock Zenoah 80cc opposed twins. Indexing
    and spark plug made and cutting the bridge made a noticeable
    difference.


    Bill M.
    Attached Images Attached Images
    Last edited by wmazz; 07-25-2022 at 06:24 PM.
    Horsepower == Speed, RPM != Speed



  10. #10
    I dream skis Jim_ii's Avatar
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    Re: Do you reuse your spark plugs?

    Quote Originally Posted by wmazz View Post
    For watercraft this can be some minor increases, but to
    some people it is worth the time to and effort.

    We use to race giant scale rc pylon racers with 8' to 12'
    wingspans and stock Zenoah 80cc opposed twins. Indexing
    and spark plug made and cutting the bridge made a noticeable
    difference.


    Bill M.
    Thanks!

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