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Thread: low speed jets

  1. #1

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    low speed jets

    will the low speed jets affect your full throttle plug readings .if the lows are to small will they affect your main jets .


  2. #2
    Wankel till I die!! jonjonwells's Avatar
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    Excerpt from Mikuni Watercract Owners Manual


    "The reason for adjusting the circuits in this order is because several circuits contribute to the total fuel delivery of the carb. Changing the low speed jet for example, affects wide open throttle fuel delivery to some degree.

    To achieve an accurate calibration with a Super BN you should Adjust the tuneable circuits in the following order:

    1. Low Speed Adjuster
    2. Pop Off Pressure
    3. Low Speed Jet
    4. High Speed Jet
    5. High Speed Adjuster"

  3. #3
    cheatin' piston popper addicted's Avatar
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    yes. lows affect the total jetting. Raising the low 10 points is just like raising the highs 10 points as far as wash is concerned. difference is that the extra gas is introduced at a different throttle position.

    If the wash is good, you would want to change the main by the same amount as the pilot. I am tuning a ski that has good wash, but not so good holeshot. I am increasing the pilots by 5 and reducing the mains by 5 to compensate.

  4. #4

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    my ski is good on topend but has no wash .but it has a little bog when you hammer it from an idle . and my low screws are open 2 turns .

  5. #5
    cheatin' piston popper addicted's Avatar
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    Lately, what I have been doing, is adjusting for best idle with the low adjuster. than hammer it. If it you need to open the low screws more than 1 turn from seated to keep it alive, keep changing the pilot jet until you get what you are looking for. A major pain in the but, but I want a perfect idle and holeshot without funky loading up and such.

  6. #6

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    Sounds like you need some bigger pilots at least Lugs! I think my low's are only open 1/4 or 1/2.

    What year model is this one?

  7. #7

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    Jeff its on a 00 pro my jetting is 122.5 on the lows and 140 on the highs she runs at 7900-8000 all day but i have no wash appearing on my pistons
    thanks

  8. #8
    Moderator beerdart's Avatar
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    How many hours on the pistons??

  9. #9

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    80 hours

  10. #10
    Moderator beerdart's Avatar
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    What kind of fuel and oil??

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