Outboard positioning

Discussion in 'Powerboats' started by mojounwin, Dec 19, 2005.

  1. mojounwin
    Joined: Dec 2004
    Posts: 77
    Likes: 1, Points: 8, Legacy Rep: 10
    Location: Queensland, Australia

    mojounwin Junior Member

    I have an auxilary outboard that I am wanting to tilt 90 degrees when not being used, so that the shaft is horizontal. I've heard that this may cause the fuel to drain out of the carby and make it difficult to start when I need to use it. Do people think this will be a problem?

  2. Tim B
    Joined: Jan 2003
    Posts: 1,438
    Likes: 59, Points: 0, Legacy Rep: 841
    Location: Southern England

    Tim B Senior Member

    Normal practice is to raise outboards to roughly 45 degrees. raising any further could cause engine trouble, but it is more likely to cause a big engineering problem to actually rotate it and hold it that far.

    Do you have a depth problem with the outboard? Could you lift it off and stow it internally?

    Tim B.
  3. gonzo
    Joined: Aug 2002
    Posts: 15,881
    Likes: 1,255, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    Depends on the engine make and model.
  4. george allard
    Joined: Jul 2005
    Posts: 61
    Likes: 2, Points: 0, Legacy Rep: 7
    Location: kentucky

    george allard Junior Member


    Turn of the gas supply off, and run the engine until the carb is dry.
  5. Deering
    Joined: Feb 2005
    Posts: 481
    Likes: 24, Points: 18, Legacy Rep: 44
    Location: Juneau, Alaska

    Deering Senior Member

    Be careful if it's a four-stroke. Some of them only liked to be stored in certain positions due to oil accumulation. Check your owner's manual.

  6. marshmat
    Joined: Apr 2005
    Posts: 4,127
    Likes: 149, Points: 63, Legacy Rep: 2043
    Location: Ontario

    marshmat Senior Member

    If the motor's on the boat, it's also important that the lower gearcase is always below the level of the powerhead- if you tilt past about 70-80 degrees, with most engines, water that's left in the inside of the gearcase will drain back up the exhaust lines into the cylinders. As Deering says, four-strokes are also sensitive to tilt due to their oil, which really ought to stay where the maker intended it to. If you're storing long-term, do as george says and unplug the gas line and run until it dies. Many engines also have a screw on the bottom of the carb for draining the float bowl. For your aux engine, I'd suggest tilting it only far enough to have the skeg clear of the water- probably about 45-60 degrees, most small motors have a pin or latch that can lock them in this position.
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.