Mercury 40 4hp

Discussion in 'Outboards' started by idahopanfish, Sep 25, 2011.

  1. idahopanfish
    Joined: Sep 2011
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    Location: Twin Falls, Idaho

    idahopanfish New Member


    I have a 12' starcraft I have modified for a 1-2 person fishing boat.

    It has a mercury 40 4hp motor on it & I am wondering if it is possible to get my motor to run at a slower speed. I am currently trolling at 3.4 mph and would like to get down to 1 mph, is this possible?
  2. kenJ
    Joined: Jul 2005
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    Location: Williamsburg, VA

    kenJ Senior Member

    might be easier to just drag a sea anchor. I have seen several DIY models, a 10-12" 2x8 with eye bolts on each end and a simple bridle attached to the stern. The wood floats so if you need to stop to reel in a fish the bridle has less of a chance of fowling the prop. You can adjust the length or add a second as necessary to get the speed you need.

    Attached Files:

    Last edited: Sep 27, 2011
  3. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    You mean the thing does 3.4 mph idling in gear ? Seems a lot for a 4 hp motor.

  4. pistnbroke
    Joined: Jan 2009
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    Location: Noosa.Australia where god kissed the earth.

    pistnbroke I try

    revs should be about 750 could try a finer pitch prop but yes 4 mph does seem fast ..was that down stream ?? GPS shows speed over the river bed. 1 mph yes get a Minn Kota Electric outboard
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