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  1. #1
    PWCToday Newbie OAS's Avatar
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    top speed of older sea doo

    Just curious.
    We have 2 97 seadoos. A 720 GTI 3 seater and a 780 GSX 2 seater.
    The GSX can hit between 55 and 60 mph (says the guage anyways...)
    But the best we can get out of the GTI is 45 to 48......
    Is that normal? Or does the extra 60cc's make that much of a difference?
    Anyway to coax a bit more speed out of the GTI without breaking up the piggy bank?

  2. #2
    PWCToday Guru
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    Re: top speed of older sea doo

    your asking for trouble leave the 720 alone mod the 787 .
    95 hx 787
    96 xp with miller motor
    92 gmc typhoon and 99 frc vette

  3. #3
    Resident Guru hafweigthr's Avatar
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    Re: top speed of older sea doo

    Sounds very normal to me. GTI is a little heavier and larger(more wetted surface). The impeller pitch is also not as steep which will also limit top end speed. However the impeller is probably nearly ideal for that ski and power plant. Seadoo would want it to be as optimum as possible to maximize performance.

    I am not a big modder cause it can take significant money while losing longevity in most cases.
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  4. #4
    PWCToday.com Is My Home Away From Home pwgsx's Avatar
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    Re: top speed of older sea doo

    Leave them both alone, the $$ you put in will not give you much of a reward in speed.
    16 RXP-X 300
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  5. #5
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: top speed of older sea doo

    Gti with 717 is only a 44-46mph machine. The 787 responds well to mods without sacrificing reliability in rec form.
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
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  6. #6
    PWCToday.com Is My Home Away From Home seadoobutch787's Avatar
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    Re: top speed of older sea doo

    My 96 GSX has 16/23 skat swirl, 85/88 R&D nozzles, re jetted carbs with Prok air filters and a R&D head. It runs great about 57mph. You could put a Factory Pipe SPec 2 on the gsx but I would leave the head stock.
    1997 Seadoo SPX---limited mod
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  7. #7
    PWCToday Newbie OAS's Avatar
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    Re: top speed of older sea doo

    Thanks for the input guys.
    Ive changed the jetpump oil in both and greased the driveshaft.
    Doesnt look like either one had been done in ages.
    I'm a dirtbiker guy just getting into jetski's.....
    Thought there might be some little "tip and tricks" to get more speed, cheap. ??
    Like different sprockets, better tires, muffler, air cleaner, etc on a bike.
    Never hurts to ask. O,o

  8. #8
    PWCToday.com Is My Home Away From Home kcr357's Avatar
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    Re: top speed of older sea doo

    No. Its a big 3 seater with a small engine. Get a 98+ gtx with a 951 if you want more power
    How many gerbils could a gerbil jammer jam if a gerbil jammer could jam gerbils?


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