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  1. #1

    Default Ratio for 1960 Evinrude Lark 40 HP

    I have found resources that say 24:1 for anything prior to 1964. Just bought a selco service manual that says 50:1. Can anyone shed some light on this?

    Thanks
    Steve
    [email protected]

  2. #2
    Join Date
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    Default Re: Ratio for 1960 Evinrude Lark 40 HP

    This always brings lots of response.------------------24:1 is the ratio for 1960.----------------But marketing and competition comes into the picture.-----------Folks think that a motor that can run on 50:1 must be a better designed motor.---------So it came to pass that suddenly motors with no mechanical changes or improvements could run on 50:1 in 1964.

  3. #3

    Default Re: Ratio for 1960 Evinrude Lark 40 HP

    Quote Originally Posted by racerone View Post
    This always brings lots of response.------------------24:1 is the ratio for 1960.----------------But marketing and competition comes into the picture.-----------Folks think that a motor that can run on 50:1 must be a better designed motor.---------So it came to pass that suddenly motors with no mechanical changes or improvements could run on 50:1 in 1964.
    OK..... going from 50:1 to 24:1 is a decrease of realistically half the lubricant. Any idea why would the service manual would recommend 50:1 for my 1960?

    Thanks
    Steve

  4. #4
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    Sep 2010
    Location
    ontario
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    Default Re: Ratio for 1960 Evinrude Lark 40 HP

    ?????-----------Going to 24:1 doubles the amount of oil.---------That is why some older motors are still running nicely !!!

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