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  1. #1
    BlueFishCrisis's Avatar
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    1994 SLT750 - Can't get rich enough

    94 SLT750 with

    -stock 69.75 pistons
    -honed cylinders
    -110-120 compression on all 3
    -8 hours on top end rebuild
    -102.5 main jets
    -RPMs in the 6100s top speed in the mid 40s.
    -95 SL750 CDI and Impeller.
    -780 FA with open element.
    -Full fuel system upgrades including 3 outlet and new lines.
    -Custom restrictor installed.
    -8" long black reinforced fuel line pulse hose.

    Great out of the hole strong accel to speed, midrange punch good. High speed screws are open past 3 turns on all three with no change in topend RPMs. Started out with 1/4-3/8 past stock settings and performance has not changed at all (good or bad) up to 3 + turns out. Getting more and more fuel spray out of the top of the carbs as I open the needles. Wash still looks like this: CEN / PTO / MAG.

    Click image for larger version. 

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ID:	256260Click image for larger version. 

Name:	94 Polars 750 Mag Piston Wash.jpg 
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Name:	94 Polaris 750 PTO Piston Wash.jpg 
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    Planning a carb rebuild over the winter but not sure that is the only issue here.... I would think eventually it would bog from running too rich and wash would start getting crazy..... Comments always appreciated.... I'm stumped.


  2. #2
    Resident electronics hacker UnityRacing's Avatar
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    Don't feel bad. I bust my butt at work all day, and I can't get rich enough either !!
    (Sorry I couldn't resist)

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Three turns out is too much. You need to raise the high speed jets

    What do you mean custom restrictor?

    What's your fuel pressure at WOT?

  4. #4
    BlueFishCrisis's Avatar
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    Quote Originally Posted by xlint89 View Post
    What do you mean custom restrictor?

    What's your fuel pressure at WOT?
    I did not have a restrictor in the return fuel line so I made one out of a hose barb and #90 jet.

    I am going to run through a few of these items first...... http://www.greenhulk.net/forums/showthread.php?t=91227

  5. #5
    I'm addicted to Polaris PWC ghostinstallations's Avatar
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    Im in the same boat....Im at 105 jets with a solid 3 psi idle and 6 psi WOT fuel pressure.....I dont get it.

  6. #6
    Connecticut CrazyA's Avatar
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    Maybe try a #60 main jet in the return. I can't remember the exact size on the stock restrictor, but it's tiny. I think it wound up being much smaller than a #90 jet, but double check that. #90 works in alot of applications, but it might be worth looking into. I'm trying to go off memory. Kevin will know. What size needle and seats?

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    #90 jet is too large. The 780 restrictor is only like .018 orifice.

    And the PRO 785 uses a #55 for the 44's with 2 fuel pumps.

    Needles and seats should be 2.0

  8. #8
    BlueFishCrisis's Avatar
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    Quote Originally Posted by xlint89 View Post
    #90 jet is too large. The 780 restrictor is only like .018 orifice.

    And the PRO 785 uses a #55 for the 44's with 2 fuel pumps.

    Needles and seats should be 2.0
    I have some stock restrictors now after picking up a few parts boats. I will swap it out and check on the needles and seats. I haven't touched the needle / seat set up from when I got them...... I believe the carbs are from a stock 95 SL setup.....

  9. #9
    Connecticut CrazyA's Avatar
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    Give the stock restrictor a shot. That alone can do it. It doesn't have to be a combo of restrictor/needle and seats together, the oversized restrictor alone could be the culprit.

  10. #10
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by ghostinstallations View Post
    Im in the same boat....Im at 105 jets with a solid 3 psi idle and 6 psi WOT fuel pressure.....I dont get it.
    Do you have any mods done to the boat? (impeller, reeds, exhaust, heads, bored oversize, etc....)

    Have you tried 110 jets?

    Have you checked your timing?

    Do you have a different CDI installed?

    NGK BPR8ES spark plugs installed?

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