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  1. #1

    SLT780; replaced engine but now I have water in the cylinders

    Recently replaced engine in (96 i think) polaris slt780.

    I'm still in the break in period but last time I took it out it wouldn't start. The MFD went dead and after getting it home I pushed the reset switch and that did the trick.

    I had to also replace one of the longer fuses in the black box.

    I pulled plugs and noticed there seem to be a decent amount of water in cylinders 1 and 2. How could this be coming in?
    Last edited by K447; 08-21-2012 at 10:17 PM.


  2. #2
    After I replaced engine I had to replace the starter. I had to take off the exhaust manifold. I reused the gasket that goes in between the exhaust manifold and water manifold, could that be the issue?

  3. #3
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    Quote Originally Posted by chazman05 View Post
    After I replaced engine I had to replace the starter. I had to take off the exhaust manifold. I reused the gasket that goes in between the exhaust manifold and water manifold, could that be the issue?

    That is possible.

  4. #4
    Quote Originally Posted by BryanP View Post
    That is possible.
    Hmm, I guess once i get all the water out of cylinders and replace gasket I will take it out again and see what happens.

    Thanks,
    chazman05

  5. #5
    Sooo...how much for the 780? stimpsonjcat's Avatar
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    You're sure it's water?

    Get a penlight of some kind and get a look in the cylinders. If you are getting water in there everything will be bright and shiny.

  6. #6
    burtonrider10022's Avatar
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    Quote Originally Posted by stimpsonjcat View Post
    You're sure it's water?

    Get a penlight of some kind and get a look in the cylinders. If you are getting water in there everything will be bright and shiny.
    Not for long...

  7. #7
    BlueFishCrisis's Avatar
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    Quote Originally Posted by chazman05 View Post
    Recently replaced engine in (96 i think) polaris slt780. IM still in the break in period but last time I took it out it wouldnt start. The MFD went dead and after getting it home I pushed the reset switch and that did the trick. I had to also replace one of the longer fuses in the black box. I pulled plugs and noticed there seem to be a decent amount of water in cylinders 1 and 2. How could this be coming in?
    FYI - You can verify the year of your ski by the last two digits of the HIN plate.

  8. #8
    Quote Originally Posted by stimpsonjcat View Post
    You're sure it's water?

    Get a penlight of some kind and get a look in the cylinders. If you are getting water in there everything will be bright and shiny.
    It was semi milky in the piston area, and after turning it over you could see the water float off the oil / gas soaked cardboard i was using. Im guessing thats why it wouldnt turn over as well( water wont compress).

    There was no water in the Gas so it had to come in from the outside, I did splash the ski pretty good with another yamaha I have but Im doubting that was the culprit.

  9. #9
    Quote Originally Posted by chazman05 View Post
    After I replaced engine I had to replace the starter. I had to take off the exhaust manifold. I reused the gasket that goes in between the exhaust manifold and water manifold, could that be the issue?
    Does anyone else think this is the most likely culprit?

  10. #10
    BlueFishCrisis's Avatar
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    Did you run the ski on the trailer with a hose at any point? Are you sure the jugs were aligned when you installed the exhaust manifold?

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