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  1. #1

    Polaris 780SL carburetor adjust and piston wash

    So where does one begin to adjust a Mikuni carburetor, I have some pics of piston wash. to me it seems like its running lean. Click image for larger version. 

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  2. #2
    seaobin's Avatar
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    I would say Mag is rich, others are Lean. Looking at the center picture, just above the word "Like" is one of the needles. And it looks to be way out already. What work has been done to the engine?

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    Click image for larger version. 

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    From first to last: My current,, When I was too rich and very lean



    Your pistons are +.5, so the engine has been rebuilt. Did you up the jets at all when you rebuilt?

  4. #4
    Well i really haven't gotten anything done besides getting the fuel pump rebuild trying to get to run, this is my friends not mine according to them they send it to someone to rebuild the entire engine ran fine until one day while they were on the water it quit on them and cant get it to resstart. Compressions are 130 on all 3, it fires up after some TLC to the fuel system. As far as the carbs i don't know if they are ever rebuild. But i want to know if theres a guide on adjusting the carbs after rebuilding.

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    seaobin's Avatar
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    seaobin's Avatar
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    I would start high and work yourself down


    SL780 - Low Speed – 5/8
    High Speed – ¾m, 3/4c, 1p

    SLT780 - Low Speed – 1-3/8
    High Speed – 1-1/8m, 7/8c, 1-1/4p

    SLX780 - Low Speed – 1-3/8
    High Speed – 1-1/8m, 7/8c, 1-1/4p

  7. #7
    So which way is rich and lean?? I see two screws one that is black T shaped i presume its low speed screw and one is brass colored is high speed am i right??

  8. #8
    seaobin's Avatar
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    yes, the tee shape is the low speed screw, the brass one is the high circuit. Counter clockwise is out

  9. #9
    turn the brass colored to counter clockwise.. to rich-en the fuel...

  10. #10
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    before you do anything. clean the carbs. Degraded fuel flow will cause all of your problems

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