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What year is my 3 hp Johnson? Model JW21E

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  • 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
    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

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

      I would go for the J4C Champion.
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