J8J spark plug

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This topic contains 12 replies, has 9 voices, and was last updated by Avatar garry-in-tampa 1 week, 3 days ago.

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    JAMES BENJAMIN
    US Member - 1 Year
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    #171018

    What is a good replacement for a Champion j8j plug.

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    XR55
    US Member - 2 Years
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    #171022

    What motor and year?

    frankr
    frankr
    US Member - 1 Year
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    #171023

    J8C is the closest current direct replacement. If you want to make it into a “J”, file the side electrode back half way across the center electrode.

    Ignorance is simply a lack of education. Ignorance can be cured. There is no cure for Stupid.

    Mumbles
    Mumbles
    Canada Member - 2 Years
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    #171037

    NGK B6S would be a good choice.

    labrador-guy
    labrador-guy
    US Member - 2 Years
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    #171040

    A J8 is to warm for OMC motors. Most Johnson and Evinrude run J6 or J4 or the AC /NGK equivilent spark plug.

    dale

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    westwind
    Canada Member - 1 Year
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    #171041

    I have a Wizard WG4 with an XJ8, I think that is before J8J, anyone have more details on the sparkplug history?

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    frankr
    frankr
    US Member - 1 Year
    Replies: 3939
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    #171044

    Old Champion book says XJ8 was a resistor plug, replaced by RJ8. I sort of doubt it belonged in your Wizard (?).

    EDIT: Same old book says your WG4 is supposed to have J8J plugs.

    Ignorance is simply a lack of education. Ignorance can be cured. There is no cure for Stupid.

    • This reply was modified 1 week, 4 days ago by frankr frankr.
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    westwind
    Canada Member - 1 Year
    Replies: 326
    Topics: 8
    #171052

    That maybe makes sense, google kept finding plugs for a Jaguar XJ8…..if they are resistor, they do seem to work.

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    XR55
    US Member - 2 Years
    Replies: 285
    Topics: 29
    #171101

    Resistor plugs should not be used in magneto equipped motors. The Wizard WG4 called for J8J that superseded to J8C that should be gaped at .025 As Frank said you can make a J8J by filing back the ground electrode half way back from the center line of the center electrode of the J8C.

    • This reply was modified 1 week, 3 days ago by Avatar XR55.
    RICHARD A. WHITE
    RICHARD A. WHITE
    US Member - 2 Years
    Replies: 1525
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    #171106

    My Wizard Super 10 has Wizard dual electrode plugs, pretty cool

    http://www.richardsoutboardtools.com

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    aquasonic
    US Member - 1 Year
    Replies: 313
    Topics: 31
    #171118

    A J8 is to warm for OMC motors.

    Not entirely true. My Johnson TD-20 owner’s manual recommends Champion J8J sparkplugs. Then again, they also recommended a 16:1 mix using 40W automotive motor oil, if you didn’t have the “Mobil” outboard oil. Maybe they needed the extra heat with that heavy oil.

    • This reply was modified 1 week, 3 days ago by Avatar aquasonic.
    Mumbles
    Mumbles
    Canada Member - 2 Years
    Replies: 3923
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    #171120

    Hotter than factory recommended plugs are usually better for worn motors with lower than normal compression to help burn the fuel mix and help prevent fouling the plugs. Motors with high compression will want to use colder plugs.

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    garry-in-tampa
    Lifetime Member
    Replies: 2958
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    #171127

    Here is what I have –

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