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Thread: sl 750 problems

  1. #1

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    sl 750 problems

    HI I am recently new to pwc's I have a couple 94 Polaris ski's a 650sl and a 750sl.
    The 650 runs great but the 750 will not rev up above around 4000 rpms.
    The carbs have just been rebuilt and it has the 3 outlet fuel pump. I have read alot of other post and have checked just about everything that I have been able to find. The only things that im not sure about are I keep hearing about something that restricts the fuel flow on the return line I think, and ignition timing. I completely enjoy the skis and dont want to give up. Im hopeing some body can point me in the right direction or if there is someone on here that is local to the St Louis area that wouldnt mind helping me that would be great...Thanks in advance...


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

    What are your carb settings?

    What's your compression?

    Are you sure you're firing on all 3 cyls?

  3. #3

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    Compression is 125 across all 3 cyl. The carbs I set by the manual not really right off hand and yes deffinately firing on all 3. I really just kinda stumped here.

  4. #4

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    I meant to say I set the carbs by the manuel and I dont really know right off hand.

  5. #5
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    There is a restrictor in the return line about 1 inch from where it connects to the carb rack It held in place by a zip tie on the outside of the fuel line. Look to make sure its there.

  6. #6

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    OK I see no restrictor.. can that be the cause of the problem Im having and does anybody know where i can get one?

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    What impeller are you using?

    And does the ski act differently when coming off a big wave? (die or clear up for a spell?)

  8. #8

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    All I really know is that the ski has the original impellar and I have not been able to do any riding simply because the thing has no power..However I did find the restrictor in the fuel line so that just leaves one more thing checked and still no idea which direction to go next..

  9. #9

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    Im also contimplating that the carbs might just be junk even though they look good and my neighbor has a set of carbs off a 780 was wondering if those would fit as a last resort...

  10. #10
    johnsonmtz's Avatar
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    Quote Originally Posted by stumped View Post
    Im also contimplating that the carbs might just be junk even though they look good and my neighbor has a set of carbs off a 780 was wondering if those would fit as a last resort...
    Yes they will fit but the jets will be different from the 750. You would need to open up the 780 carbs, install your jets, and set the high and low screws accordingly.

    KJ

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