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  1. #1

    SL780 donīt start!!!! Help!!!!

    Hi fellows!!!

    Iīm new in this forum, I got a Polaris SL780 the problems is that the pwc donīt start, there is good spark in three cylinders, carbs are ok because sprak plugs are wet whit gasoline when i took them out.
    Compression is ok.

    Any idea????
    There is spark, there is gasoline, good compression.
    I just started out of the water to check it, the I turned off, I went to drop it in the water(about 15 min from home) then once in water I tried to start and, nothing, engine cranks, good spark, good gasoline and compression.
    Coul be enithing else???

    Thanks in advance!!!!!!


  2. #2
    Moderator beerdart's Avatar
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    Welcome to the Hulk..

    Just because you have wet plugs does not mean that you are getting the correct fuel ratio. The manual can be found in the tech section.

  3. #3
    ph2ocraft's Avatar
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    Hi Marvin, WELCOME to the Green Hulk Forums!!
    So she starts out of the water but not in the water correct?
    Check the RPM's on the tach when you are cranking and see if it's spinning at roughly 400-450 RPM's.
    Could just be a weak battery not turning the engine over fast enough.
    What do you consider good compression and what does your Fuji engine have? 120 area??

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Welcome to the Hulk Marvin.

    What they said ^^^^^ comes to mind first.

    Secondly, did you have the lanyard connected?

    Third, make sure the battery cables are tight. Also make sure the negative cable connection at the engine is good, clean, and tight.

  5. #5
    Xl760 on the water/ gp760 in shop for paint
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    Welcome
    When you run a jetski out of water there is no load on the engine due to the impeller not being submerged so it is some times hard to hear or feel a missfire, Try starting the ski out of the water and feel the cylinders to see if they are getting warmer if one isnt then odds are you have a missfire. Also has the ski sat for awhile or been stored for a period of time could be dirty carbs.

  6. #6

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    change the plugs , use one of your better old ones to test each cly ,

  7. #7
    I tried to start again but this time out of the water, and was tha same, there is spark, lanyard connected, but still donīt start. I think its like some of you say dirty carbs because I donīt have another idea.

    How can I check the fuel ratio?

    Thanks in advance!!!!!!!!

  8. #8
    Moderator beerdart's Avatar
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    I would clean/inspect the carbs first.

  9. #9
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    How fast is the engine cranking over? (RPM)

    What are the compression numbers?

    Is the choke stuck open or closed?

  10. #10

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    If the plugs are getting wet it would be a safe bet that the carbs are dirty and have debree in the diaphram area. Also might be a good time to replace the old fuel lines they tend to breakdown over time due to age.

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