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  1. #1

    94 SL 750 IDLE rpm 1900

    I can't get it to idle any slower, I backed the idle screw all the way out adjusted the throttle cable, synced the carbs adjusted the low speeds as lean as I dared and still idles at 1900 rpm. When I pull the plugs it seems to be running rich.


  2. #2
    Moderator beerdart's Avatar
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    You might have a small air leak in the intake track.

  3. #3
    The fuel intake rack? I am a bit confused on where you are talking about.

  4. #4
    Moderator beerdart's Avatar
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    Any where below the throttle plates. Carb to manifold gaskets. Manifold to reed gaskets. Crank shaft seals, Pulse line for the fuel pump.

  5. #5
    Thanks for the quick response I guess I will check gaskets and seals.

  6. #6
    Moderator beerdart's Avatar
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    Do your throttle plates close all the way??

  7. #7
    ph2ocraft's Avatar
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    You are trying to set the idle in the water correct?
    You can also apply choke or primer and see if that drops the RPM's, if so, it's probably an intake leak.
    If the vessel has been sitting for awhile it takes a little time for everything to fill with fuel and might have a slightly elevated idle for a little bit.

  8. #8
    There is a small gap so no the throttle plates don't close all the way. The craft had been sitting before I started working on it. So far though I have replaced all fuel lines, tore down and cleaned the carbs (they were rebuilt before being stored for some time). Checked the reeds which were also new before being stored. I am waiting on a triple displacment fuel pump. Thanks for everyones help. I will try closing the choke and see if that slows my rpms. before tearing the carbs off again.

  9. #9
    I do have it in the water while trying to set the idle. Once I get the idle set I need to adjust the carbs I got the tuning tips off your gallery are those the easiest to follow? First time tuning carbs on a 2 stroke.

  10. #10
    Moderator beerdart's Avatar
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    THANKS RANDY!!!

    Start with the screws set at 1 turn out, and tune with the tachometer for peak Rpm, then stop there and count the number of turns on the high speed screws. Write this down on a piece of paper.. Then turn the high speed screws in all the way and open them to 1/4 turn open. (Now you will be testing starts only, so no more big high rpm trips around the course). You are only turning in the high speeds to allow you to easily tune the low speeds.

    Now check the low speed screws and set them at 1 turn and do a practice start; To test the low speed setting pretend that you just jumped the start and you have to start with no holder. Hold the ski by yourself and hold as many Rpm as you can (don't blow it out first for testing) and then nail the throttle hard.... NO FARTHER THAN 50 KILOMETERS, as you are only testing the start response

    If it blubbers like a schoolgirl trying to guzzle a quart of beer, then it's too rich on the low speed screws..
    If it falls flat on the line (like someone punched you in the stomach).. It's too lean on the low speed screws.

    When you like the acceleration off the line, stop there and count the number of turns on the low speed screws. Write this down on a piece of paper.. Then re-set your high speed screw where they show the best peak Rpm earlier and try both a start and a peak Rpm run...
    It will probably "blubber" a little off the line... DO NOT turn in the low speed screws... Instead, go back out on the course and fine tune for peak Rpm again.. The blubbering off the line is caused by having too much fuel in the high speed circuit... Write down your new high speed setting on the piece of paper along with the best low speed setting that you found earlier, this will be your base-line carburetor settings.
    If the high or low speed screws are open more than 11/4 turns, then you need to swap to the next bigger jet.
    If the high or low speed screws are closed all the way, then you need to change to the next size smaller jet.


    *** If no matter what you try, it still won’t leave the line without falling on its face "lean bog"... Then try the next size lower pop-off spring in the carbs... Don't be afraid to try #95 or even #80 gram springs..

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