Mystery 1941 Johnson Seahorse

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    CentMassBass


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    #198776

    Have an old Johnson Seahorse serial # is 403832 Model MS 20. From what I have found and dig up it’s a 1941 1.5 hp. It was my grandfather’s outboard. Last ran in 1966 was kept in its box has compression. I would like to try and get it running. How to test for spark on a old outboard like this? I cannot attach photos from my iPhone. Color of motor is silver with red writing. It has 2 cylinders which throws me for a loop because the 1.5 motor should only have 1 cylinder. All help would be appreciated.

    Buccaneer
    Buccaneer

    US Member - 1 Year
    Replies: 3836
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    #198777

    I didn’t find a photo of a MS20, but found this video of a 1940 MS15,
    which I assume is similar.
    You’re correct, the MS20 should be a single cylinder.
    If you found MS20 on the rope pulley, I’d say someone put
    that pulley on your two cylinder engine.
    Can you email the photo to one of us so we can post?

    Prepare to be boarded!

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    CentMassBass


    Replies: 12
    Topics: 1
    #198781

    Buccaneer, thanks for follow up. The ms20 is stamped on the cylinder housing along with the serial number. I also came across the YouTube video that you showed as well in my research. I also have a repair parts catalog for ms20 and md20 outboards as well. I wish I could attach or send the photos/ images but size limitations and file types do not allow.

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    CentMassBass


    Replies: 12
    Topics: 1
    #198782

    Buccaneer I emailed you some pictures of what I have. The original starter rope was replaced by my grandpa he used a small block of wood and some clothesline rope it works to spin it over.

    Buccaneer
    Buccaneer

    US Member - 1 Year
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    #198783

    I sent you a PM.

    Prepare to be boarded!

    oldemtr
    oldemtr

    US Member - 1 Year
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    CentMassBass


    Replies: 12
    Topics: 1
    #198794

    Hey thanks for the reply. I have the repair parts catalog already. I also have seen that ebay listing also.

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    opposedtwin

    US Member - 1 Year
    Replies: 686
    Topics: 225
    #198797

    So does it still have 2 cylinders?

    Buccaneer
    Buccaneer

    US Member - 1 Year
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    #198803

    Following are photos of the motor in question.

    MS201

    MS202

    MS203

    MS204

    Prepare to be boarded!

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    lloyd

    US Member - 2 Years
    Replies: 198
    Topics: 1
    #198837

    That is not an MS20. It is an HS20, 2.5 HP. And a very nice looking one. Go to the thread about the TN that wasn’t running right. Much good info there about these similar motors.

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    CentMassBass


    Replies: 12
    Topics: 1
    #198844

    Yes still has 2 cylinders

    Buccaneer
    Buccaneer

    US Member - 1 Year
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    #198845

    I can see how he mistook it for a MS. Glad Lloyd solved the mystery!
    And yes, very nice looking motor!

    MS203-1

    Prepare to be boarded!

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    opposedtwin

    US Member - 1 Year
    Replies: 686
    Topics: 225
    #198849

    “Yes still has two cylinders” 🤣🤣🤣

    HS20 indeed! Lots of HDs out there but not many HS models! That is a really nice example! Take care of that baby!

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    CentMassBass


    Replies: 12
    Topics: 1
    #198851

    Opposedtwin and buccaneer, thanks to both and lloyd for the confirmation on the model for the motor.

    Otwin .. you say rare motor should I put this on the back burner and look for another motor to push my boat? My intention is to use the motor a few times a month till fall.

    For all watching waiting to chime in. How do I test for spark? And where do I go for guidance with this old outboard?

    Buccaneer
    Buccaneer

    US Member - 1 Year
    Replies: 3836
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    #198856

    I believe the only difference in the HD (deluxe) and HS (standard) is the HD had the rewind.
    Guess most people back then probably paid the extra $5 or whatever is was, for the rewind.

    Prepare to be boarded!

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