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Thread: 780 tuning

  1. #1

    780 tuning

    Im working on a 96 sl 780 just put a 92 650 pipe on,97 785 pro Ign,jetted the carbs 2 sizes bigger high and low,put a 12-17 prop,bored nozzle to 86 mm,took out cone spacer, a hotseat waterbox and rebuilt carbs. I put it in the test tank and it seems to be sluggish from mid to high range,It will get up ,just not quickley, Like it over proped. Is it because of being in the tank or do I need to go bigger on the nozzle? Any help would be great! THANKS


  2. #2
    Bing-A-Ding-Ding-Ding, Brrrrrap! Brrrrrrrrrap!!! Polaris_Nut#1's Avatar
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    I have no clue, but I have been thinking about doing the same pipe swap on my 750 and my SLX this should be interesting. I can't wait to see how you make out.

  3. #3
    Yea, me too
    I hope this thing really turns on. I just need a little help for one of the super tuners around here!! I will take any help now. Even if they tell me it needs new muffler bearings! LOL.

  4. #4
    ph2ocraft's Avatar
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    Dirty, go to my gallery and check the tech section. It has a tuning guide, that will work like a champ.
    The most important thing is to make SHORT 100 yard bursts and see how you're doing. You need to verify your MAX RPM's so you can see how the impeller worked as well. You don't want to be lugging the engine if not neccessary.

  5. #5
    cheatin' piston popper addicted's Avatar
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    What rpm is it revving to?

    Where's sealion when we need him?

  6. #6
    I didnt get to ride it yet,but I did put it in the test tank and it just seemed sluggish in mid range, Like its working hard, If you bring the rpm slowly it will get up the pipe.I didnt mess with carb adjustments to much yet. But seemed like it needs a bigger nozzle .Im still new at tuning on skis. Id think it should rev faster. Didnt want to push it to hard. Hurting parts eats up alot of time, So I tought Id ask you guys , THANKS FOR THE HELP.

  7. #7
    ph2ocraft's Avatar
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    I'd throw it in the lake and see how she felt.

  8. #8
    Ill have to get it in the water this week, Im taking it to shore this week end, If its sluggish in the water do you think a bigger nozzle will help?

  9. #9
    SeaLion's Avatar
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    I'm here lol. I had too much work today. Anyway, the combo sounds pretty good. I personally have an 87mm nozzle. I also have 44mm carbs. You are going to have to jet and tune the stock carbs right imo.

  10. #10
    I do have a 87mm nozzle to try and the carbs I jetted up, low was 67.5 now is 70 and on the high 110 now 112.5 I have another sl780 with more mods maybe Ill try 44s on that on after I get this running good

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