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  1. #1

    SLT 780 Premix carb setting

    Just converted to Premix and ski bogs down at hign rpms. Should the carb low speed and high speed settings be readjusted to account for the premix.

    I'd appreciate anyones ideas on this

    Thanks


  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Lows, no

    Highs may need a TINY bit richer. Maybe a 1/8 at most.

    Not enough to cause a high speed bog though.

    Have you gone through the carbs and fuel system yet?

  3. #3

    Polaris Carb Setting

    No I haven't been through the fuel or carb yet. Was hoping that I wouldn't have too. Another question, I'm looking at my manuel how can I tell the difference between carbs from models with first transition hole above throttle or below throttle plate at idle?

    Thanks

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    That would be the first thing you should do. If you continue to ride it like that, I guarantee you will have piston damage.

    Look for the tiny holes inside the carb throats and determine their location.

    What manual are you reading asking about that? And why do you ask?

  5. #5

    Carb Type SL SLT

    Sorry it took so long to get back with you, wife says I'm spending to much time with the skis. The Clymer manual mentions the two types of carbs, but only distinguishes by the description of the transition holes above or below, no picture or photo. That is what I am trying to confirm. The carbs are still inplace and I cannot see any hole along the carb throat above or below the throttle plate. I hear mention that the number EC78PWE-02/05 is for SL 780 and EC78PWE-03/04 for a SLT and EC78PWE-04 for the SLX 780. The SLT and SLX adjustments are the same. Can you confirm this. I have a 96 SLT 780.

    I turned in both the low / high speed screw just to see the number of turn would match up to the carb type. Got some confusing data. The low speed screws matched up the the EC78PWE-03/04 (1 3/8 turns) but the high speed screws match up with the EC78PWE-02/05 (3/4 to 1 turn).

    Now due to the fact I now premix are the screw setting as important as using the oil pump. Isn't lean and rich refer to fuel and oil mixture?
    Thanks

  6. #6
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    1996 SLT 780

    Main jet #110

    Low jet #67.5

    High spd screw M=1 1/8 C=7/8 P=1 1/4

    Low screw 1 3/8

    pop off pressure 20-24 psi



    The high speed screws should be turned OUT (adding fuel) about 1/8 turn more than stock because of the premix.

    And when you read about "lean" and "rich", we are referring to air to fuel mixture, not oil.

    Too much air = lean. Too much fuel = rich

    Please do a search for "piston wash" and familarize yourself with it.

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