Resistor Spark Plugs?

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  • This topic has 7 replies, 6 voices, and was last updated 9 years ago by XR55.
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  • Buccaneer

    US Member - 1 Year (includes $3 online payment fee)
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    #891

    In looking to order spark plugs for my 1936 Muncie Neptune OB34A, 4 hp twin,
    I found a chart that suggested using Auto-lite 386 (18mm plugs).
    They are listed as "Resistor" type spark plugs.
    What’s your thoughts as far as using resistor type spark plugs in a magneto
    system?
    Thanks, TG

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    frankr

    US Member - 1 Year (includes $3 online payment fee)
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    #11759

    That’s the trouble with spark plug charts. They’ll tell you to use anything that fits the hole. As a general rule, resistor plugs are to be avoided in outboards, with a few exceptions. And I don’t think that Muncie would be one of them.


    RICHARD A. WHITE

    Lifetime Member
    Replies: 1840
    Topics: 140
    #11766

    I have an OB34A in the shop I am going to restore, ,it has Champion UD-14 plugs in it. My Champion Spark plug chart shows usage of the 6M plug

    http://www.richardsoutboardtools.com
    classicomctools@gmail.com


    Buccaneer

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    #11770

    Thanks for the input guys. I’ll check out the champion 6M

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    Mumbles


    Replies: 5764
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    #11773

    Save the resistor plugs for the modern CD ignition systems.


    jcrigan


    Replies: 533
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    #11785

    I Have Champion #516 or D-16 in mine. Set at 0.025". I was recommended those Autolight 386’s some time back and bought a dozen of them. They don’t work on any of our old motors.


    Buccaneer

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    #11808

    Glad I asked! Thanks, TG

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    XR55

    US Member - 2 Years
    Replies: 310
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    #11810

    The Champion spark plug list shows the 6M plug. The modern plug number for the 6M is a D14 #514 gaped at .025 , the D16 #516 is a hotter heat range, possibly too hot and may cause problems if used.

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