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  1. #1

    Join Date
    Mar 2019
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    Mississippi
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    SL 750 performance upgrades!

    Hey guys and gals, I recently bought a 1996 SL 750 and I want to completely refurbish it from top to bottom. It hasn't been registered since 2004 and is in need of some TLC. I want to know what performance modifications I can do to it to get some more acceleration. Top speed is great too but I'm more looking for acceleration. I want to really get the ski back to looking and performing as it did many years ago but I figured while I was doing all of that work I might as well give her some more get up and go, haha. Any help is greatly appreciated!

  2. #2
    RLACEMAN's Avatar
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    Aug 2011
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    Random Lake WI
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    #1 mod for acceleration are 780 reed spacers, you need matching bolts to go with them.


  3. #3

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    Does that require any tuning or any modifications to make it run properly? Any other things for acceleration and performance increase? Appreciate the help!

  4. #4
    RLACEMAN's Avatar
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    only turning the high speed mixture screws about an 1/8 turn, if you use an aftermarket reed petal you will need to upjet a size. With todays fuels its not a bad idea to upjet one size anyway.

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Welcome to the Hulk.

    I don't believe there were any 750's in 1996. Please verify the year by the last 2 numbers of the Hull Identification Number.

    If it is a 96, it's most likely a 780 and in that case you would already have spacers.

    If it is a 750, it's either a 1993, 94, or 1995.

    A couple pics of the ski might help identify it, and/or any mods already done.

    In general, I prefer the longer Ocean pro ride plates VS. the stock short ones


  6. #6
    Hazard Racing's Avatar
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    Aug 2016
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    Posts
    Renjon

    V-force reeds, or Boyesen Pro peddles.
    Reed angle spacers from a 785 Pro might work.
    Used Pro 785 intake and used Pro 785 44mm carbs ( eBay $100)
    Only use non- ethanol 90octane fuel or better with 135-140 Psi compression.

    Milling the heads and cutting squish back in, need to keep .055” to .060”squish.
    Your looking for 145-150 psi on a fresh motor.
    ( use 1 gallon of 110-112 race fuel to 5 gallons of premium fuel).

    Cylinder porting. Your going to raise the exhaust port timing to 190° to 192°,
    widen the exhaust to 48mm cord width, shape with a nice eye brow roof.

    Clean up the transfer entry’s to allow more flow.
    Un-shrowd the transfer entries.

    You can also use the 780 cylinders and heads on your 750 bottom end , may have to bore out your case for the 780 sleeve tails in the crank case.

    SBT , WSM and Wiseco all still offer pistons and over bore kits.

    The 1992-93 SL 650 short real sortie pipe works great on the 750’s , gains you a lot of RPM.

    TDR ,HoT Seat , PSI, DG all made performance water boxes for the 750.


    Group K in Arizona does the porting , see web site for Polaris 750.
    Hot To Go in Grand Island New York does porting.
    Rich’s Taylored porting does porting, see his web site.

    A stock type 2000-01 Polaris 1200 Pro intake grate.
    Extended ride plate , Watcon still has new ones in stock for the 650-750.
    13/18 Skat Trak swirl impeller in a 1994-1995 750cc ,148mm pump.
    The newer Stainless Steel pump stators are a good up grade.

    WetWolf makes a nozzle stuffer kit as well, check out his web site.

    Hope this helps.





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