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  1. #1

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    Hi new Polaris SL 780 user with lots of questions.

    Hi, I am a newbie.
    2 days ago, I bought a 96 Polaris SL780 on craiglist. The guy bring the ski to my house and try it for me. it fired up right away and sound smooth. Yesterday, I pulled it out and install and reverse flush kit to it and try to start it. it took me a long time to get it started and even if it get running it dies when i release the gas. I then realease that that two of the cylinders are not running because when i put my hand on it, it feel cold. So i start opening it up to check. First thing I notice is that there is water in the cylinders, not too much though. Then when i open the last cylinder, i was shock to see it. "please look at the picture"
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    what could have done this? it look someone use a screw driver to hit on it....
    below is my question as a newbie to PWC. P/S: I owned a boat so i know some basic.
    1) What engine oil do i need to use for this PWC? TCW3?
    2) I need to clean the carbulators, if there a way to take it out? it seem like inorder to take out the engine parts, I need to remove the top side of the jet hull?
    3) where is the best please to get the cylinder replacement. i only need one.
    4) the reverse flush kit seem to be the one forcing the water into the cylinder, can I hook up the hose to the waterintake at the base of the engine, would it be better.
    5) can I run the jet ski without water for a few minutes?


  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Welcome to the Hulk.

    There are a few things wrong with that pic you posted.

    Is that the front cylinder? (MAG)

    If it is:

    1. the head gasket is on wrong. It should read 78, so it's up-side down. And the "shark's fin" tab should be under the cooling bar.

    2. the piston is on wrong. Arrow is supposed to be facing the front.


    The piston is on wrong, so the ring got caught in the intake posrt and broke causing that damage.

    Sorry buddy, you got screwed.

  3. #3

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    Thanks for the reply, I know i got screw....... I remove the piston and going to rebuilt it, I already spend $800 on it , might as well spend a copuple more to get it fix.I need help. After I removed the piston and see that the crankshaft have water mixture in it. what do i need to do to clean it up? and do i need to add any lube in it?

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Get any water out of the crankcases FAST. Then spray everything inside with fogging oil to prevent any rust from forming.

  5. #5

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    1) I suppose that I need to remove the whole engine and turn it upside down? is there any online manual to show me how? I already remove most part, just don't want to mess up.
    2) the water is kind of milky, it was mix with the oil inside. do i need to remove all the parts and clean it up one my one?
    3) this is the 2nd day since the water is in there. no rust yet as i put in some fogging oil since the water get in. please let me know about question no 1

    here are some picture. so far I think the only problem with this ski is the previous owner have it rebuilt wrong. have the piston in the wrong way like you said. the 3rd cylinder still have stong compression, I was think maybe just need to get the piston replace. or maybe i need to buy the whole cylinder replace?
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ID:	204454is this cylinder still usable?

  6. #6
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    No need to remove the engine. Get the water out any way you can.

    I've used a Shop vac and small rubber hose to reach the bottom of the case.

    You just need to spray the crank pretty heavily with fogging oil as you turn it with your hand. That'll be fine.

    Your cyl can be bored, no need to replace.

  7. #7

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    Thaks for the reply. do you know if i can get people to bored it for me as I have no idea how to do it. and i believed after boring i will get need to get the piston with larger ring like .50mm to put in right?

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