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  1. #1

    Sl 750 water system

    Hi all

    Have been looking and looking through here, but can't find the info I need.

    I have a not entirely well SL750, 1994, which I am sorting out.
    Although I have found most of the answers I need, I am trying to find out more about the cooling system!


    On my ski there are 2 tell tales (outlets) one on either side of the hull, roughly around the steering head area.
    On my friends Yamaha's, there is water pumping out of these at all times, whilst the things are running, even if on a hose, but on mine nothing!

    Should there be water coming out of these?
    Does anyone have a schematic of the system?
    And how des it work?

    Any help appreciated, as last time I used the ski it melted(internally inflated) the exhaust hose, which whilst I have another, I am trying to make sure it doesn't happen again!

    Jon


  2. #2
    seaobin's Avatar
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    not sure on both sides, mine only has one. large 3/4" outlet is the hood/steering area drain, not connected to the cooling loop or bilge. That is on the port side of my ski

    other could be a retro bilge if you have one.

    On the 750 water comes from the pump through a 3/4" line to the lower end of the exhaust chamber. There is a tee that fees the exhaust cooling. Up through the cylinders and out the water rail to the jet pump area.

  3. #3
    On mine both pipes go to the center of the ski, under the steering bracket and there is a cylindrical moulding, but can't see any other connections to it, or find what it is meant to do!.

    Thanks for the reply though.

  4. #4
    seaobin's Avatar
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    You must do a lot of water over the bow. Those tubes help drain water that gets in under the steering.. If they were not there, every time you took water over the ski it could fill you hull.

  5. #5
    I have never seen anything out of either side hole on mine.

    On the Yamaha's they seem to be actually part of the cooling system, as while running on a hose, it is hot water coming out of theirs.
    Seems strange that we have 2 and mine certainly don't appear to do anything!

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    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Tris70uk View Post
    On mine both pipes go to the center of the ski, under the steering bracket and there is a cylindrical moulding, but can't see any other connections to it, or find what it is meant to do...
    That is a water drain for the engine air intake system into the hull.

    It catches water that would otherwise splash into the hull interior, and drains the water out the sides.

  8. #8
    Right thanks, therefore having nothing to do with the engine cooling at all!

    Guess I will just carry on and check everything I can in the rest of the system!

    Thanks again.

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