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  1. #1

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    Unhappy 1996 Polaris slx 780 unable to get it tune perfect help please

    Hello guys i have a slx 780 1996 and i believe it should go to 6800 rpm right?
    well it only goes 5800. i rebuild the carbs and new fuel lines put carbs to factory setting but it doesnt get 6800 rpm now only 5800. i removed the grey cable just to try and nothing.


    Also the MFD is saying LOPR in the screen and there no moister in the line by the way.
    please help im trying to take it today to the beer can island


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by cubajorge2008 View Post
    ...Also the MFD is saying LOPR in the screen and there no moister in the line by the way...
    DO NOT ride it until you get the engine RPM problem figured out. Riding a 2-stroke PWC while it is not running properly is often a quick way to turn a small problem into a big and more expensive problem.

    Check cylinder compression. Make sure you have the correct spark plugs installed. Trim back the ignition wires 1/4" and re-screw on the spark plug caps.

    The MFD can CALibrated, if necessary.

    If you haven't yet, read the following links

    Polaris Fuji (blue) engine


    Multi-Function Display (MFD)

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    The 780 should be running 6500 RPM, it limits at 6700.

    You need to get a small flashlight and check the piston wash on your pistons. Tha will tell you if you need more fuel than what the book calls for.

    Did you install another impeller? If so, which one?

  4. #4

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    No i did not install a new impeller but i notice that when the ski jumps on waves and when rich down it will go faster....
    but when i stop speeding and try to speed again then it stops and go back to slow speed.... also smell like fuel.... i try closing the high speed screw to all the way but still same problem. could it be the low speed are way to open?

    do the low and high combine at high speed?


    Also when i try to turn on the ski it only turns on when i press the gas pedal...... else it will just try but not turn on. it could be missing air? or gas? i have no idea. i try closing gas opening gas etc and nothing.

  5. #5
    Polarisitis loonatik's Avatar
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    Just a thought for your elimination process. Did you check height of N/S arm when rebuilt the carbs? Too high it will keep the needle open all the times. Also I notice (at least on my sl 650) the needle has tendency getting stuck open because of low pop off springs. Make sure N/S and arm cleaned and smooth.

  6. #6

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    Ok..... i already experience a needle staying open causing a engine flooded but now even if i close the carb completelly still smell like gas.... and i notice in the tail is throwing dark oil like burned. maybe gas and oil mixed i dont know but too many but i think will be normal if it is premix i dont know. also when the jetski hit a wave it goes faster i dont knwo why

  7. #7
    Polarisitis loonatik's Avatar
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    You mean close the carb by turning those jet adjusters in all the way?

  8. #8

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    yes the adjusters thats the only way right?

  9. #9
    Polarisitis loonatik's Avatar
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    Your jets are probably to big. When you're rich flood it is too hard to start. Smell of gas and black oil are the excess fuel.
    When you're airborne, there's no water resistance, the engine has a chance to rev up spitting excess fuel, that's why you feel that push when hitting water again.

  10. #10

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    OK i put main jet #110 and Pilot jet 67.5 just like the book says.... im so confuse on why will there be excess fuel...

    Also i notice you from tampa, fl? what part? maybe you can help me get it running please? i been with it broke since i decided to rebuild the carbs

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