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  1. #1

    Rough Running SL 750

    I have a 95 SL 750 that started out running rough and backfiring. I replaced all the fuel and the fuel filter and it starting to run a little better but still a very rough idle and a lack of power.

    I have already checked the reeds and they are not broken a couple of chips on the ends of a few petals. The cylinders have the proper compression as well.

    Can I assume that this could be carb related and they need to be rebuilt or would this be electrical. The ski will continue to run but will not get up on plane.

    I appreciate all the help.


  2. #2
    Sorry thought I needed to add a few things:

    Fuel pump upgrade was done a couple years back.

    The ski will run at full throttle with low power but then bog down and I pull the chock and it will pick up RPMs and not die out if I let it go after a second or so.

  3. #3
    2000 Polaris Pro 1200 rdizz81's Avatar
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    im not the best person for this stuff YET lol but i would also check your impeller or jetpump. this can cause all of these symptoms you are mentioning.

  4. #4
    seaobin's Avatar
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    IF you pull the choke, does it change how it runs?

    Is it smoking a lot?

    how do the plugs look?

    How old are the plugs?

  5. #5
    2000 Polaris Pro 1200 rdizz81's Avatar
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    as far as the backfiring

    Low fuel pressure, clogged fuel filters, and lines i think this can cause the engine to run extreamly lean.

    and i was being told if you still have the "GREY" fuel lines it is wise to replace those as well and that could very well be the culprit too.

  6. #6
    Quote Originally Posted by seaobin View Post
    IF you pull the choke, does it change how it runs?

    Is it smoking a lot?

    how do the plugs look?

    How old are the plugs?

    If I pull the chock it stays running but no additional power but keeps the motor from dying out. I have to move the chock in and out otherwise it will die out if left engaged or not engaged, about 1/4 inch pulled out and it runs better

    It is smoking a good amount.

    The plugs were black and were replaced the new set are also dark and lighter at the tip of the plug but black on the electrode and threads.

    Thanks

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Welcome to the Hulk.

    It's never a bad idea to thoroughly inspect the carbs.

    Also replace the fuel hoses if you haven't yet. Making sure to reinstall the restrictor in the return hose.

    Make sure the autocock has been removed.

    Here's a pic of the restrictor (brass) and the autocock.



    Take the time to inspect the petcock also for restriction.

  8. #8
    seaobin's Avatar
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    if pulling the choke doesnt kill the engine or at least really screw up the idle you are lean. Clean the fuel system/carbs before you kill you engine.

    Check you wash (do a search)

    What do your plugs look like?

  9. #9
    Thank you for all the input. I have new carb rebuild kits ordered as well as new reeds since they did show some signs of wear and the fact they are easy to get to at this point.

    My fear is that it could of been something electrical but all your input sounds like a fuel system issue which hopefully it is.

    Again, thanks.

    If any other thoughts are out there please let me know but I will be cleaning out the carbs, replacing all the fuel lines and see where that takes me.

  10. #10
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Often, the screws inside the carbs are very hard to get out without stripping. It helps to use an impact screwdriver.

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