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  1. #1
    Cadet
    Join Date
    Jul 2003
    Location
    Minnesota
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    1

    Default What year is my 3 hp Johnson? Model JW21E

    Would someone be kind enough to tell me what year Johnson 3hp motor I have? Model JW21E. Serial E2639271 I think it is mid 60's. Also - the plate on the motor says to use a J4J plug - but all the shops say to use J6C. So which is right? And does it matter much? Thanks .

  2. #2
    Lieutenant Commander
    Join Date
    Mar 2001
    Location
    Stockholm, Sweden
    Posts
    1,627

    Default Re: What year is my 3 hp Johnson? Model JW21E

    JW-21 Johnson 1966J4J plug for 1966 fuel and oil.J6C for todays fuel and oil. I guess

  3. #3
    Moderator JB's Avatar
    Join Date
    Mar 2001
    Location
    The Hideout, Whitt, TX, USA
    Posts
    45,903

    Default Re: What year is my 3 hp Johnson? Model JW21E

    I would go for the J4C Champion.

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