Merc 3 cyl 2 stroke

Discussion in 'DIY Marinizing' started by steele m.a., Dec 24, 2010.

  1. steele m.a.
    Joined: Dec 2007
    Posts: 44
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Victoria B.C. Canada

    steele m.a. Designer/Engineer

    I have a strange motor I need assistance with . A mercury 2 stroke , in a
    Bayliner 20 ski boat ( sterndrive ).
    It is a 3 cylinder vertical 2 stroke .
    I need to know more about this beast , if any one out there can assist me.
    A friend got it , with boat , as an insurance adjustment .
    It runs , but is not as reliable as I would like it to be.
    The Merc shop says it's doing what it's supposed to do , but I disagree .
    It won't idle , it has dual carbs , synchro joined , on one side of the thing .
    Answers ?
    marksteele2010@yahoo.ca
     
  2. gonzo
    Joined: Aug 2002
    Posts: 15,013
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    Location: Milwaukee, WI

    gonzo Senior Member

    By don't idle, do you mean it dies?
     
  3. steele m.a.
    Joined: Dec 2007
    Posts: 44
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Victoria B.C. Canada

    steele m.a. Designer/Engineer

    Yes . Rough running beast . Owner has me holding dual throttle open to keep it alive.
    Won't idle - dies .
     

  4. gonzo
    Joined: Aug 2002
    Posts: 15,013
    Likes: 832, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    Start with a compression test. Then test the spark on all cylinders. Rebuild the carburators and synchronize them. Adjust the timing.
     
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