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  1. #11
    Spongebob PWCToday.com Is My Home Away From Home attnondeck's Avatar
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    Re: How to increase top speed

    Quote Originally Posted by motoman96 View Post
    you need to be turning WAY more than 6500 rpm's.

    bRRRRRAAAAAAAPPPPPP!
    Brendan

    1990 SN SJ 701 1990 SN Super Jet 650 Winter build
    1990 550SX
    1994 FX1





  2. #12

    Join Date
    Jun 2008
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    bremerton wa,
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    44
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    668

    Re: How to increase top speed

    a 550 with 185psi a pipe and a rejetted carb should do 43mph. With porting a lightened flywheel a impeller and advanced timming it should run 47-49mph

  3. #13
    PWCToday.com Is My Home Away From Home MrSki's Avatar
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    Sep 2005
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    AZ
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    Re: How to increase top speed

    Damn...I'll say it again anyways. Go on a diet!

    Sopping wet I'm 150 so this has never been a problem for me. My slowest 550 is 47 MPH...faster is over 50 but I think the GPS gets a little squirely so I'm not sure the final speed. And no, they are not stock.
    1993 Laser Jet F15 - Mild port to PJS Cylinder.
    1992 Laser Jet F14 - Raced in 1992 World Finals.
    1992 550 SX - PJS Secret Weapon Big Bore, Kind of fast, LOL.
    1989 JS 550 - PJS motor Dual 46's, 50 MPH on GPS.
    1989 Wet Jet - Upgraded 1994 50 HP motor & exhaust. 45 MPH, yee ha!
    1986 JS 550 - Engine built. Working on fiberglass!
    1976 JS 400 - Pretty much just a shell. Sure want to restore this some day!

  4. #14
    Frequent Poster jetskijim's Avatar
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    Mar 2008
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    Orange Ca
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    35
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    193

    Re: How to increase top speed

    Gotta Agree with you there I'm 170 My 13 year old (95lbs) cuz does like 6-7 mph faster, I heard (for race Motorcycles) 5Lbs = 1 hp for GP bikes, and .5lbs spinning weight = 1hp, I'm sure On the "Hydro" track is a bit diffrent but in any case Being in better shape is good for you and the ski-

  5. #15
    PWCToday.com Is My Home Away From Home 550/440's Avatar
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    Jan 2009
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    Arizona!!!
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    4,558

    Re: How to increase top speed

    Yeah, when I was 189lbs, my ski RIPPED! Now, at 215, it is a a little sluggish, but the extra muscle lets me toss the ski around like a little toy!!!
    "needs carb work" is a classic excuse for I don't know wtf is wrong!

    2009 EME Q8, 1100 ADA WB1 with MRD. 2004 BLOWSION RN SJ.

    Big thanks to Newmiller Machine in Oregon for the great work! (Mcn6 on PWCtoday)

  6. #16
    Attention ***** PWCToday.com Is My Home Away From Home JonnyX2's Avatar
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    Sin City USA
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    Re: How to increase top speed

    Ive been on MrSki's 550 and I must say, it is very fast and trust me, not everyone can ride those damn things!!
    Quote Originally Posted by Firebird A/C&Heating View Post
    OMG.....Rules for 550 vintage ski class...550 ski riders do not conform to any kind of rules. That is why you are riding a 550 ski in the first place. Rules suck....
    PS...the rule book will be in my 550 pump
    Quote Originally Posted by WB1994
    Listen , stop your cryin' , its only an X2.

  7. #17
    I dream skis
    Join Date
    Feb 2004
    Location
    USA
    Posts
    625

    Re: How to increase top speed

    I think the 550 is still one of the easies skis I have ever rode. Still have three I ride in the surf, light, good on gas even with two carbs. The fast ones we still run 225 psi on the head and still get 4-5 years on the crank. After you have your motor and pump setup “How to increase top speed” try this works for us over the last 20 years and makes a 550 fun >> http://shred-master.com/prod07.htm

  8. #18
    PWCToday Newbie
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    Oct 2020
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    parker az
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    56
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    3

    Re: How to increase top speed

    all it took for me was impeller,sbn44 kerker exhaust and i weigh 185 pds ski moves pretty good

  9. #19
    PWCToday.com Is My Home Away From Home Cleatusjo's Avatar
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    Chesapeake Bay, Anne Arundel co.
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    Re: How to increase top speed

    No doubt... Went from 230 lbs to 165 lbs after a run with Pancreatic Cancer 6 years back. I picked up 2 or 3 mph on the STX-R.
    '94 Kawi TS 650
    2002 Kawi STX-R 1200
    too much to list

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