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  1. #1
    diamondwatercraft's Avatar
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    3rd season in a row case filled with oil 99 GTX RFI

    The title says it all. The case fills with oil every winter. We pump it out the cylinder holes and then it runs the entire season.

    I know the seals should be shot but why would it run fine all year?


  2. #2
    The center crank seals are slowly leaking. They don't leak to the outside of the engine, so it won't run lean. I'd store it with little to no oil in it.

  3. #3
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    I've been telling folks to pinch off the rv feed line during the off season. You have to tag it really well as if you forget to remove the clamp the results is not good.

    little tranny seal fix in the oil for the RV might help it ( loop the rv lines after you put the seal fix in, you don't want to let that stuff go into the oiling system)

    so far the clamps are doing the job for a few folks who cannot afford to correctly fix this problem.
    Last edited by K447; 05-22-2014 at 10:09 PM.

  4. #4
    diamondwatercraft's Avatar
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    Thanks for the info gentlemen!

    Can I have you clarify what "tranny seal fix in the oil for the RV might help it (lool the rv lines after you put the seal fix in, you dont want to let that stuff go into the oiling system)"

    Not sure of your RV abbreviation.

  5. #5
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    RV=rotary valve

    the RV uses injection oil for lubrication(one of the reasons for the large injection oil filter is to catch the little brass bits that wear off the RV during normal use.)

    by looping the line you can limit the amount of oil being circulated and allow the tranny seal to work a bit without it ending up in the main oil tank.

    by looping the line you can keep the same few oz of oil circulating enough to perhaps soften the crank seals up a bit (m this won't work if the seals are damaged)

    short of replacing the crank, it's worth a try, you might do OK with just pinching the line off when the ski isn't being used.

    you must keep an eye on the oil level in the RV lines as if it goes dry(from oil being sucked into the crankcases) it's game over pretty quickly.

  6. #6

    3rd season in a row case filled with oil 99 GTX RFI

    Or just put a on off valve in the oil line to the rv. Turn it to off when the ski is not in use or stored. Hang your lanyard around it when it is shut off to remind you to turn it on before riding

  7. #7
    I know people with leaky seals that have been using the valve for over 5 seasons and it works perfect

  8. #8
    diamondwatercraft's Avatar
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    Thanks to you both. Great suggestions. I am going to pick it up this week and get to work on it.

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