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  1. #1
    Cliffy's Avatar
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    Been on the Seadoo, but I Still luv my 780SLT but RPM Question

    OK guys first off i'm still luving my Polaris i seem to be able to throw it around more than a newer ski and it goes good too

    But I seem to be dipping on my RPM, since the air filter mod i've only been getting to 6200 something as a top RPM also ive noticed that if left idel for a while on the water it cuts out where the rev's are dropping off,

    Am i right in thinking that i need to lean out my fast idel screw a bit more on each carb??

    Or am i better off pushing myself to get my new imepller, wear ring and bushs done this week and see how she runs next weekend????

    Thanks
    Neil


  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    You SLT is alot lighter than the newer skis. Would make sense that you can man handle the SLT better.

    Have you checked your piston wash since the FA mod?

    Did you adjust the carb hi speed setting screw to adjust for the added air?

  3. #3
    ryandi2's Avatar
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    i bet your slt realized you cheated on it and is mad at you

  4. #4
    Cliffy's Avatar
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    Hi guys, Xlint

    Piston wash looks ok, i adjusted the high speed screw as instructed should i let it out a litle more and go from there??

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    What are you calling OK wash?

    Too much or too little fuel will lower your RPMs.

    You get peak RPM when you have perfect air/fuel ratio.

    So you may need to add or subtract fuel from the adjusters to get your RPM back up.

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by xlint89 View Post
    What are you calling OK wash?

    Too much or too little fuel will lower your RPMs.

    You get peak RPM when you have perfect air/fuel ratio.

    So you may need to add or subtract fuel from the adjusters to get your RPM back up.
    And you may end up tweaking each cylinder slightly differently for optimum wash pattern (and power).

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by K447 View Post
    And you may end up tweaking each cylinder slightly differently for optimum wash pattern (and power).
    Right. ^^^^

    Each cyl needs to be tuned as it's own seperate engine. Meaning, not every cyl is going to be set exactly as the other 2.

  8. #8
    Cliffy's Avatar
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    cheers guys

    ill get her in the sea over weekend and sort it out, have you got any pis of what piston wash pattern should be looking like?

    thanks
    Neil

  9. #9
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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  10. #10
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    Chocolate brown on the crown of the piston with fingernail size clean areas where the ports are. if the piston head is half clean, your way rich, if all black, your way lean.. but if your all black, definetly richen the mixture or else a hole will melt thru the top of the piston.

    I found a perfect pic for ya.. chocolate brown with the port areas clean.I heard the wash can take up to 30 mins to develop from the new carbs settings. some say a couple tankfuls.. guess it depends on compression, plug range,fuel type, ete....



    Heres another one. if yours look like this or a little more like above, your GOOD>
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