Tips Prepping for Stock Class with and SXR800 -Midwest Riders
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  1. #1
    PWCToday Regular RacerX1606's Avatar
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    Tips Prepping for Stock Class with and SXR800 -Midwest Riders

    Hey everyone,
    Im looking to get my SXR race ready for next season's stock class. Now i dont mean "remember your tools" or "dont forget to be there early" but mechanical tips that let the stock ski perform etter while staying "stock".
    What do you mid-west riders use for jetting ?
    Is 100 octane considered race fuel ??

    Thanks
    Sent from my IBomb

  2. #2
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    Re: Tips Prepping for Stock Class with and SXR800 -Midwest Riders

    If its a stocker there is no reason to use 100 octane fuel. Just stick with anything that is ethanol free. You'll find better gains through tuning the carbs, prop and water routing.

    My currently jetting is 77.5 low 137.5 high @ 21psi with aftermarket flame arrestors.
    Jeremy S.

  3. #3
    PWCToday Regular RacerX1606's Avatar
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    Re: Tips Prepping for Stock Class with and SXR800 -Midwest Riders

    So what mods are acceptable in the stock class ? Great Lakes Watercross's website didnt really explain to much about what is ok and nok. unless i didnt look hard enough..

    I only ran the 100oc because it smelled good and had a longer shelf life over the winter months
    Sent from my IBomb

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    PWCToday Guru Jim_ii's Avatar
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    Re: Tips Prepping for Stock Class with and SXR800 -Midwest Riders

    Quote Originally Posted by Jeremy S. View Post
    If its a stocker there is no reason to use 100 octane fuel. Just stick with anything that is ethanol free. You'll find better gains through tuning the carbs, prop and water routing.

    My currently jetting is 77.5 low 137.5 high @ 21psi with aftermarket flame arrestors.
    Curious what you mean by water routing? We have a stock 800 and have been wondering what we could do with a water bypass or similar?

  5. #5
    I dream skis MTRHEAD's Avatar
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    Re: Tips Prepping for Stock Class with and SXR800 -Midwest Riders

    You need to find out of Great Lakes is stock spec or stock lites. Different rules but close in performance

  6. #6
    PWCToday Regular RacerX1606's Avatar
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    Re: Tips Prepping for Stock Class with and SXR800 -Midwest Riders

    whats the difference ?
    Sent from my IBomb

  7. #7
    Resident Guru indy650sx's Avatar
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    Re: Tips Prepping for Stock Class with and SXR800 -Midwest Riders

    pretty sure great lakes goes by prowatercross rules
    03 SXR
    13 SuperJet
    95 HX
    93 Waveblaster

  8. #8
    PWCToday Regular RacerX1606's Avatar
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    Re: Tips Prepping for Stock Class with and SXR800 -Midwest Riders

    il have to clearify with the greatlakes team on that. but Stock Ski lets sxr's have a modified head?
    Sent from my IBomb

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    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Tips Prepping for Stock Class with and SXR800 -Midwest Riders

    Quote Originally Posted by RacerX1606 View Post
    Is 100 octane considered race fuel ??
    First off 87 octane unleaded pump gas makes more HP than most higher
    octane race fuel. Increases in octane does not increase Hp, it decreases
    HP. To increase Hp with race gas, manufactures will add oxygenators. But
    normally these fuels are illegal (and they kill brain cells).

    When most people refer to 100 octane, they mean Avgas. Avgas has less
    density than pump or race gas, so in order to run at the same fuel air ratio,
    you must jet richer for avgas. Otherwise I do not recommend Avgas.

    There is free HP in your premix oil. By increasing your oil mixture from 50:1
    to 20:1 with a high quality MX oil like Maxima, and Yamalube2R you can
    decrease friction, increase horsepower, and reliability by adding more oil.

    My final recommendations: 87octane unleaded, and 20:1 Maxima. Then
    read my blog and learn how to tune your carbs starting with the idle
    drop test.

    Peak rpm is lost when low screws are too rich!



    Bill M.

    Keep the impellers leading edge smooth and free of rock dings.
    Horsepower == Speed, RPM != Speed



  10. #10
    PWCToday.com Is My Home Away From Home mcn6's Avatar
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    Re: Tips Prepping for Stock Class with and SXR800 -Midwest Riders

    Are you serious?

    Conventional winter blend gasoline typically has a 12,500 btu/gal rating, whereas, 100LL (avgas) has a 12,500 btu/gal rating also. Simply put pump gasoline and aviation gasoline (100LL) have the same energy content, period. If you are seeing a horse power loss or gain it is not from the gasolines octane rating.

    Conventional pump gasoline typically has a specific gravity of .720 to .770, whereas, 100LL typically has a specific gravity of .680 to .740. In comparison, VP C10 specific gravity is .766 and C12 is .717. Bottom line is that you are not running the "ragged edge" with compression and ignition timing, pick whatever gasoline is readily available to you locally and don't worry about it. If you are on the "edge", you need to be very careful with tuning when switching gasolines. However, 100LL is a perfectly acceptable fuel to use in applications where a leaded fuel is permitted.

    Free horsepower from adding more pre-mix oil??? Whatever you say... lol!

    My final recommendation? Not naming any names, but someone definitely has a few loose screws.



    Home of Newmiller Machine

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