1974 Evinrude 40H.P.

Discussion in 'Outboards' started by Machinist, Sep 12, 2008.

  1. Machinist
    Joined: Sep 2008
    Posts: 4
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    Location: US

    Machinist New Member

    This motor starts up fairly easy and runs ok at half throttle. When I try to give it more gas it starts to sputter like it is going to stall. It will only run good past full throttle when it is not under a load. I would greatly appresciate any help!!! :confused:
     
  2. Kay9
    Joined: Oct 2006
    Posts: 589
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    Location: Central Coast Oregon US.

    Kay9 1600T Master

    Clean the carb. Then check the diaphram (sp?) pump. That will likely fix your probs.

    K9
     
  3. Machinist
    Joined: Sep 2008
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    Location: US

    Machinist New Member

    The carb has been cleaned and no difference in performance. The motor runs good at full throttle for 2-3 minutes before it acts up. Do you think it could be the fuel pump like you said before ? The motor runs okay with no load on it. This is my first boat so I have no clue what I am doing!
     
  4. FAST FRED
    Joined: Oct 2002
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    Location: Conn in summers , Ortona FL in winter , with big d

    FAST FRED Senior Member

    Evinrude ignition coils have a VERY limited life.

    New coils and ignition wire will cost little at NAPA, and will help resolve weather it is a fuel problem,

    FF
     
  5. Machinist
    Joined: Sep 2008
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    Location: US

    Machinist New Member

    Thanks for the advise Fast Fred. I will replace the coils first, if nothing else at least they will be new.
     
  6. Kay9
    Joined: Oct 2006
    Posts: 589
    Likes: 26, Points: 0, Legacy Rep: 279
    Location: Central Coast Oregon US.

    Kay9 1600T Master

    Yea coils first, then fuel pump. I had to do it all on my 64 OMC, now it runs great. If this dosnt do it you might hae the compression checked.

    K9
     
  7. Machinist
    Joined: Sep 2008
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    Location: US

    Machinist New Member

    I have replaced the coils but have not had the chance to get it in the water yet. I also found out that the timingwith the high speed jet linkage needs a replacement for the adjustment screw.
     

  8. dd24skater
    Joined: Oct 2007
    Posts: 17
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    Location: Ohio

    dd24skater Junior Member

    I would check compresion
     
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