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  1. #1

    Talking 1964 johnson seahorse 5.5hp fuel mix ratio

    i have a johnson seahorse 5.5hp engine code CD-21A does anyone know the correct fuel mix ratio i should be running on , it will be mineral oil not synthetic im using. thanks.

  2. #2
    Honorary Moderator Emeritus tashasdaddy's Avatar
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    Default Re: 1964 johnson seahorse 5.5hp fuel mix ratio

    there is some controversy, as to which to run 24/1 or 50/1. my manual states 50/1, twc3 outboard motor oil, as long as it is rated tcw3, petrol or synthenic is fine.
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  3. #3
    Supreme Mariner
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    Default Re: 1964 johnson seahorse 5.5hp fuel mix ratio

    1964 is the year that OMC introduced their 50:1 oil

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