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  • 8bolts
    PWCToday Newbie
    • Oct 2020
    • 3

    horsepower js550

    hey i've tried in the forum and on google to search the horsepower of the js550 with some mod..
    and after few hour of research i didnt find any good information.

    i'm looking for a list of mods done and the hp
    what a stock engine with a pipe can get?
    what if we add a bn44, intake?
    180psi head?

    etc etc

    where can i find thoses informations?

    thanks
  • Myself
    PWCToday.com Is My Home Away From Home
    • Jun 2006
    • 7771

    #2
    Re: horsepower js550

    Stock JS engine was 36-41 depending on year.
    A decent pipe is worth 5 or 6 horsepower.
    Add a BN44 and matching intake.....maybe another 2hp.
    Add more compression.....probably another 2hp
    That puts you up around 50hp.

    That's why conversions are so popular. For all the money spent modding you could drop in a stock 650 with a tad more hp to begin with! I opted to jam a Tigershark 640 down in mine....around 75hp! Thread on here somewhere.
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

    Comment

    • 8bolts
      PWCToday Newbie
      • Oct 2020
      • 3

      #3
      Re: horsepower js550

      Thanks for the reply

      Comment

      • jetbum
        I dream skis
        • Oct 2004
        • 600

        #4
        Re: horsepower js550

        X2 on the engine swap, most effective way to increase HP
        Officially done owning skis but I still like reliving the old days

        Comment

        • 2strokesmoke
          Top Dog
          • May 2011
          • 1584

          #5
          Re: horsepower js550

          And add 100cc. Night and day difference

          Comment

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