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Thread: Help

  1. #1

    Default Help

    Hey guys,
    I have a old Johnson 7 1/2 hp sea horse
    Won't stay running.
    Hard to start, but when I pull the plugs out , pull the cord a few times and put the plugs back in it will fire right up.

    But I can't keep it running long enough to adjust the rich n lean

  2. #2

    Default Re: Help

    Also I noticed that one spark plug wire has a gold ban on it...does it matter which one is on the top plug

  3. #3
    Join Date
    Sep 2010
    Posts
    17,050

    Default Re: Help

    The wire with the band on it was the top plug wire when it left the factory.-----How old is " old " and what colour is this motor or post the model # for it.-------Does spark jump a gap of at least 5/16" ??-----What is compression ?----On the 56 / 57 / 58 models there was a filter in the glass bowl , perhaps check that.

  4. #4

    Default Re: Help

    Spark plug gap is good, new coils and points n plugs.

    Can the glass bowl filter be cleaned or do I need a new one?

    Is there a middle ground to start with the rich n lean control...

  5. #5
    Join Date
    Sep 2010
    Posts
    17,050

    Default Re: Help

    So the model # is a secret ?----I suspect a 56 / 57 / 58 model.

  6. #6

    Default Re: Help

    It's a 1957 I was told...
    Where's the model number located?

  7. #7

    Default Re: Help

    Model number is CD 13 A

  8. #8
    Join Date
    Sep 2010
    Posts
    17,050

    Default Re: Help

    That would make it a 5.5 HP model.

  9. #9
    Join Date
    Apr 2010
    Posts
    4,519

    Default Re: Help

    What year is it ??

  10. #10

    Default Re: Help

    Everything about looks identical to the 1957 except the mount...it's greenish.
    Everything else is red and white and says 7 1/2 hp

  11. #11
    Join Date
    Sep 2010
    Posts
    17,050

    Default Re: Help

    Green motors of that era were 1955 and older.------The motor is a mix of parts.-----CD 13 is a 56 model 5.5 HP-----The 7.5 was an ---AD---- model
    Last edited by racerone; 05-17-2019 at 08:10 PM.

  12. #12

    Default Re: Help

    All I know is side by side it's identical to my grampa 7.5 except for the mounting bracket to hold it on the boat.
    I just ordered a rebuild kit for the carburetor...
    I'll let you know how it goes..

    Thanks for all your info...

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