1937 Johnson 210, 3.3 hp, runs “Doggy”

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  • Buccaneer

    US Member - 1 Year
    Replies: 5681
    Topics: 884
    #259859

    First time I had this one in the barrel today after going through the motor this
    last winter. It idles better than it runs fast. When you try going fast it
    sounds real “doggy”….. like a slow dog on a hot day.
    The carb was tuned-in to it’s sweet spot, and there’s not much leeway either
    way on the needle adjustment.
    The cylinders are running nice and cool, so it’s not over heating.
    Both plugs were hot to the touch.
    The longer I ran it, the worse it got going “fast”, and eventually quit on me.
    Being that it idles better than it goes fast, I’m thinking maybe the coil is B.O.
    I only tested it with an ohm meter and it seemed okay.
    Any other ideas on what’s wrong?
    I’ll have to see if I can find one running on YouTube for comparison.

    Prepare to be boarded!


    dave-bernard

    US Member - 2 Years
    Replies: 1773
    Topics: 27
    #259861

    partly blocked exhaust???????????


    Buccaneer

    US Member - 1 Year
    Replies: 5681
    Topics: 884
    #259868

    Exhaust was sandblasted inside and out. It’s just a big can with two inlets,
    one outlet, all wide open.

    Prepare to be boarded!


    Buccaneer

    US Member - 1 Year
    Replies: 5681
    Topics: 884
    #259869

    I just listened to several Johson 210’s run on YouTube.
    Some of them sounded a little “doggy” as well, but seem to
    wind up a little more.
    This one sounded the best……..

    Prepare to be boarded!


    HARRY D. NICHOLSON

    US Member - 2 Years
    Replies: 70
    Topics: 3
    #259870

    Some motors can’t stand running in smoky air thats’ already been through combustion.  Set up a window fan blowing onto the front to keep smoke away from the carb.


    Buccaneer

    US Member - 1 Year
    Replies: 5681
    Topics: 884
    #259871

    Harry, I’ll try the fan tomorrow after I get the gas leaks fixed. Thanks.
    I put 11:1 fuel mixture in the motor……. not sure what it’s suppose to be.
    Also, I should verify what spark plugs it takes.

    Prepare to be boarded!


    The Boat House


    Replies: 3795
    Topics: 95
    #259875



    Too much prop maybe?
    Tubs
    .


    Buccaneer

    US Member - 1 Year
    Replies: 5681
    Topics: 884
    #259879



    Too much prop maybe?
    Tubs
    .

    I believe it has a three blade prop on it. I have not compared it to other 210 photos,
    but that’s good food for thought. The reason I was thinking coil is because the
    longer I ran it, the worse it ran at high speed, and eventually quit. Not sure if I
    tried restarting it after that point, as I need to address the gas line leaks.
    Thanks.

    Prepare to be boarded!

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