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  • 15 HP issues

    Greetings,
    New Poster here....

    I've owned a Yamaha 15MSH for several years now and am very pleased with it.
    However, there are two issues that are cause for concern.
    The first has been a problem since the day I bought it and although not "serious"...I am curious if other members have experienced this and what they may have done to address it.
    After *****ing around a lake for half an hour or so, I decide to move to another location. When I give her gas to take off (after bringing all the tackle in) she will take off like a rocket, but then will stutter and hesitate for a second or two...then will take off at full speed. At first I though this might be a carbon buildup on the plugs, but this even happens when I use the NGK plugs without electrodes.

    The second issue happened just two weeks ago and ruined our holiday. We were staying at a large lake in the BC Interior and decided to take a run to the far end (12 miles away) to try some fishing there.
    After *****ing a few weed beds, we took off and a few minutes later the engine started to surge...almost as if it were running out of fuel.
    I changed the plugs and used a spare gas line, but a day or two later, this problem re-appeared. If I run at about 3/4 throttle, there isn't a problem, but if I go to full throttle, she would start to surge again.
    Note: This doesn't happen every time either!

    On a related issue, should the priming bulb be hard and full of fuel at all times, or does it "deflate" while running? I noticed BOTH conditions during the week, and did not seem to correspond with engine troubles.
    Last edited by Qwazert59; 08-25-2014, 11:40 PM.

  • #2
    the PRIMER is simply that.
    all it does is PRIME the fuel system, once primed its not needed.
    no it wont stay hard when running and no it should NOT collapse when running.
    if it collapses it means there is a restriction between the bulb and the liquid in the tank.

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    • #3
      fuel is sucked through the line and primer ball from the tank so it will not remain hard/firm but should not collapse.
      If it does collapse there is a restriction some where between the bulb and tank pickup

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      • #4
        Thank you for the replies.

        OK....bad choice of words on my part; the primer bulb didn't actually collapse, but when I felt it, it wasn't hard and full of fuel....which apparently is normal.

        Any advice on the other issues?

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