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  1. #1

    missing on the hole shot/before plane

    Hi, I have a 96sl700. Before getting on plan it sounds good but it has an occasional miss (maybe one or two misses). Once on plane it is all good. Someone told me that I should take the carbs off and rebuild and clean them. I think that it may just be old gas.


    Can old gas cause the engine to miss a little at the hole shot? the tank was 3/4 full when I bought it. I added more gas fuel stabilizer (sta-bil and startron). I also changed the filters.

    what can cause the engine to miss before plane.

    What about additive like Lead substitute, Octane booster, and water absorber like iso-heet? Will or can any of these help me?


    Also I was told that I may be too big for the ski and that just how it works, I am 200lbs.





    Thanks


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Have you cleaned and rebuilt the carbs?

    Fuel stabilizer doesn't help old gas.

    It only helps if you add it when the fuel is fresh, then it delays the degradation over time.

    How old is the fuel?

    If the gasoline is really old, drain it out of there. The cost of replacing the fuel is much less than the cost or rebuilding the engine.

    While you have the fuel drained, you can clean the tank, and make sure there is no water or gunk in there.

    Old fuel loses octane. With less octane, you run the risk of detonation. Detonation damages pistons.

    Even operating at mid-throttle can cause detonation if you have insufficient octane for the engine.

    200lbs is not too much rider weight for an SL700.

    The engine should runs smoothly without missing or bogging, regardless of rider weight.

  3. #3
    Can I try to clean the carb with carb cleaner while the engine is running?

    How hard it it to rebuild a carb? the thing that I am worried about is adjusting the carb once I install the rebuild kit. I read that the pwc has to be in the water to adjust the carb. Is adjusting it hard? Do I need a tachometer?


    Thank you.

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by sebas54 View Post
    Can I try to clean the carb with carb cleaner while the engine is running?

    How hard it it to rebuild a carb?

    the thing that I am worried about is adjusting the carb once I install the rebuild kit.

    I read that the pwc has to be in the water to adjust the carb. Is adjusting it hard?

    Do I need a tachometer?
    You cannot properly clean the carbs without taking them apart.

    It is not that hard to rebuild your carburetors.

    Go slowly, do one at a time, and use Genuine Mikuni rebuild parts (or Mikuni rebuild kits). You can get them here, or here.

    Click here for the Polaris Service Manual, which outlines how to work on the carburetors. Also, the same page links to these carb rebuild guides.

    You do not need a tachometer to set the carbs to factory settings.

    Once you have them set and re-installed, you can then check piston wash patterns (after some riding time) to confirm the high speed settings are correct for your engine.

  5. #5
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    [quote=K447;1066971]

    Go slowly, do one at a time, and use Genuine Mikuni rebuild parts (or Mikuni rebuild kits). You can get them here, or here. [/quote]

    I was thinking the 700 had Keihin carbs.

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by K447
    ...Go slowly, do one at a time, and use Genuine Mikuni rebuild parts (or Mikuni rebuild kits).
    You can get them here, or here.
    Quote Originally Posted by starflight View Post
    I was thinking the 700 had Keihin carbs.
    Well, that is probably true!

    Then I suppose he should use genuine Keihin rebuild parts

  7. #7
    Thanks for your replies I really appreciate it. Why should it be a genuine kit. I found one made by Winderosa for only $37. That's more than half the price of the genuine kit. Is the genuine that much better?

    Thanks

  8. #8
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Quote Originally Posted by sebas54 View Post
    Is the genuine that much better?

    Thanks
    I'll have to say absolutely.

  9. #9
    Moderator beerdart's Avatar
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    Can you describe the miss?? It may be cavitation.

  10. #10
    it sound like rrrrrrrrrburrrrrrrrrrburrrrr

    Something like that. It is subtle and it only happens once or twice at take off and not every time. I want to take a video of how it sound but haven't had an opportunity. I don't think it misses out of the water on a hose.


    thanks

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