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  1. #1

    Default Spark Plug Question

    Have a Sea King (Montgomery Ward) 5 hp. Current spark plug is a Chapion J4C. Have seen other recommendations of a J12C or RJ12C. Any one know what the correct one is? Found these numbers on the engine.

    Model K500 2106 A
    Serial 714127
    Type 27405 R (There are a couple of letters before this but are unreadable)

  2. #2
    Join Date
    Nov 2005
    Location
    Chesapeake, Va, US
    Posts
    1,111

    Default Re: Spark Plug Question

    Either RJ12C or J11C will work just fine.
    Bill H PTC USN Ret
    A manual is a cheap investment.

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