95 SL 750 Tune
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Thread: 95 SL 750 Tune

  1. #1
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    95 SL 750 Tune

    If I am running 6340-50 RPMs with a Polaris 5131371 prop. Is this all that I should hope for with a 95 750 with the following mods.
    SLX780 stock ride plate
    Polaris 5131371 prop Stock 96 SL 900(Skat 15-20 swirl)
    Boyseen Pro Reeds
    Boyseen Reed Spacers
    Ocean Pro Vortex Flame Arrestors
    Mikuni 3 outlet high flow fuel pump
    95 SL 750 Running
    95 SLX 800 Running THX to Sharps Marine!!!!!
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  2. #2
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    I'm surprised you are turning that much rpm with that tall impeller. You might be overloading the the engine? How's the bottom end and response? It can't be that great. A 13/18 would be a better choice.
    "If debt is the problem, how is more debt the solution"?
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    SUR #7


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  3. #3
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    It jumps out of the water. The low and mid seem better than with the stock 4 blade prop. I have a NuJet 5.0 and was wondering what the thoughts would be vs. the 371.

    How fast would you guess that would be at 6340 with the 371. I was seeing indicated 53 to 54 and the Yamis I was running with were seeing 58s. Is the 6340 rpms too high for this engine?
    95 SL 750 Running
    95 SLX 800 Running THX to Sharps Marine!!!!!
    360 my AMA Numberplate..

  4. #4
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    No you are actually running very well as far as rpm is concerned. I am just surprised that it is with a 15/20 . I guess not all props are created equal I would say 51-52 mph. I had more stuff on my 95 SL750 and ran a 13/18 swirl at 6400 rpm and about 53-54 mph. A Nu-Jet 5.0 is the right propr for a 750. Try it and see what happens. I still don't see how you can pull that 15/20 but you are doing it somehow.
    "If debt is the problem, how is more debt the solution"?
    Ron Paul

    If you lend someone $50 and never see that person again, it was probably worth it?

    SUR #7


    Check out the skis at:
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  5. #5
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    According to the polaris manual the Polaris 5131371 prop is a 15-20. It is a 3 blade with lots over overlap and looks just like a Skat that I have for my 780. I didn't buy it originally so maybe it has been modified from it's original form or the polaris manual is wrong on the specs for the 5131371. Does someone from IMPROS visit this borad maybe they can chime in on the 371 specs
    95 SL 750 Running
    95 SLX 800 Running THX to Sharps Marine!!!!!
    360 my AMA Numberplate..

  6. #6
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    I have currently done the following tune:

    Highs 2.5 turns out and the plugs are barely rich enough. Should I go up a jet size?

    Lows 1 turn out and loads up on idle and hesitates / dies when going to WOT after extended idling / .25 throttle(2900rpms / 5mph). Tried Tuning it out with the lows but unsuccessful. I believe I need less pop-off pressure.

    Pop off I don't remember what I set it to. I believe I need less than stock and what I have now since I have the Ocean Pro Vortex F/A.

    Any suggestions would be greatly appreciated...

    FYI, With these mods previously posted I can run with a friends 99 XP Limited 951...
    95 SL 750 Running
    95 SLX 800 Running THX to Sharps Marine!!!!!
    360 my AMA Numberplate..

  7. #7
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    My transition to full throttle from 1/4 was a lean hesitation. Since I have the OP F/A I was advised to go to a 105 jet from the stock 90. I installed those today but have not tested in the water yet. Pop-off was deemed ok since I can run rich on the bottom end but lean on the highs. I installed the 105s and have the high needles 1 turn plus the stock settings. Lows I turned back to 3/4 which is 1/4 over stock since I do not want it to be lean. I hope to make progress during testing.
    95 SL 750 Running
    95 SLX 800 Running THX to Sharps Marine!!!!!
    360 my AMA Numberplate..

  8. #8
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    The 105 jets have solved my problem and the ski is running awesome 54mph out of a 750 on GPS!!! Thanks again Sharps Marine, u ROCK!!!!
    95 SL 750 Running
    95 SLX 800 Running THX to Sharps Marine!!!!!
    360 my AMA Numberplate..

  9. #9
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    warfare, I have not done any engine mods, did you get lots more power out of switching to the reeds and spacers? Did you have to do any machining, or are they bolt-on?

    Also, what is your compression (just want to compare to mine).

    Thanks!
    '94 Polaris SL 750 \ '95 Tigershark Monte Carlo \ '82 CE Corvette \ '94 Vulcan 750 \ '95 F150 \ lots of mopar.

  10. #10
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    Reeds and spacers are more for acceleration. They bolted right on. Compression is 150psi and they are 1.0mm over.
    95 SL 750 Running
    95 SLX 800 Running THX to Sharps Marine!!!!!
    360 my AMA Numberplate..

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