Page 1 of 4 1 2 3 ... LastLast
Results 1 to 10 of 38
  1. #1
    pedruko's Avatar
    Join Date
    May 2008
    Location
    MIA
    Posts
    259

    Question gprxp rpms help!!!

    hi guys just finished my 00/05 gprxp and it only turns 7500 rpms and everyone tells me its suppose to turn around 8100. My setup is a stock 05 motor with a xs intercooler, 05+ ho pump w/ 14/20 df prop. Where should i check first or do first? thnxs for the help.


  2. #2
    Moderator Insanediego Joe's Avatar
    Join Date
    Mar 2006
    Location
    San Diego, California, United States
    Posts
    5,885
    +1
    142
    Quote Originally Posted by pedruko View Post
    hi guys just finished my 00/05 gprxp and it only turns 7500 rpms and everyone tells me its suppose to turn around 8100. My setup is a stock 05 motor with a xs intercooler, 05+ ho pump w/ 14/20 df prop. Where should i check first or do first? thnxs for the help.
    Is your pump shoe installed correctly...not hanging down?

    Is your ride plate and tabs installed correctly?

    These are simple fixes that can cause major drag and reduced rpms.

    Do you have enough clean air flow into the hull?

    Have you ran the ski with the seat off?

    Maybe try depitching to a 14/19?

  3. #3
    Hydrotoys's Avatar
    Join Date
    Jul 2005
    Location
    Mesa, AZ
    Posts
    16,712
    +1
    85
    boost pressure?
    engine temps?
    nozzle size?

  4. #4
    pedruko's Avatar
    Join Date
    May 2008
    Location
    MIA
    Posts
    259
    Quote Originally Posted by Hydrotoys View Post
    boost pressure?
    engine temps?
    nozzle size?
    boost gauge says 6 psi temp is between 130 150 and the nozzle is the stock gp1200r which i think is a 87 mm

  5. #5
    Moderator Insanediego Joe's Avatar
    Join Date
    Mar 2006
    Location
    San Diego, California, United States
    Posts
    5,885
    +1
    142
    Quote Originally Posted by pedruko View Post
    boost gauge says 6 psi temp is between 130 150 and the nozzle is the stock gp1200r which i think is a 87 mm
    your running it cold...not sure if this is your issue but...your temps should be above 160

  6. #6
    pedruko's Avatar
    Join Date
    May 2008
    Location
    MIA
    Posts
    259
    Quote Originally Posted by Insanediego Joe View Post
    Is your pump shoe installed correctly...not hanging down?

    Is your ride plate and tabs installed correctly?

    These are simple fixes that can cause major drag and reduced rpms.

    Do you have enough clean air flow into the hull?

    Have you ran the ski with the seat off?

    Maybe try depitching to a 14/19?
    ill double check all these, so i have to make sure everything is flush then?
    and also about the prop, the ski over revs off the hole it has no take off at all i have to accelerate to about 30 mph then i can hit it WOT

  7. #7
    Moderator Insanediego Joe's Avatar
    Join Date
    Mar 2006
    Location
    San Diego, California, United States
    Posts
    5,885
    +1
    142
    Quote Originally Posted by pedruko View Post
    ill double check all these, so i have to make sure everything is flush then?
    and also about the prop, the ski over revs off the hole it has no take off at all i have to accelerate to about 30 mph then i can hit it WOT
    typical gprxp stock pump problem...find your rpms first...we can work on holeshot later.

  8. #8
    pedruko's Avatar
    Join Date
    May 2008
    Location
    MIA
    Posts
    259
    so any tips on installing the plate and the tabs

  9. #9
    Moderator Insanediego Joe's Avatar
    Join Date
    Mar 2006
    Location
    San Diego, California, United States
    Posts
    5,885
    +1
    142
    what plate?
    ff plate?
    stock plate?

    stock tabs? are the spaced down at all?

  10. #10
    pedruko's Avatar
    Join Date
    May 2008
    Location
    MIA
    Posts
    259
    stock r n d ride plate en stock tabs dont think they're spaced down i put'em back the same way they where on the ski

Page 1 of 4 1 2 3 ... LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Can't get passed 3500 RPM...HELP!
    By NewYork69 in forum 2-Stroke Performance
    Replies: 11
    Last Post: 06-09-2008, 02:26 PM
  2. polaris msx 150 burning oil limeted rpm help plz
    By ln69bt in forum MSX/Matrix
    Replies: 22
    Last Post: 04-09-2008, 10:54 AM
  3. 2003 GTX SC not getting up to Speed Or RPMs ! Help !
    By RXPBeast in forum Sea Doo Open Discussion
    Replies: 11
    Last Post: 06-11-2006, 09:32 PM
  4. Loss of RPMS! Help
    By Chrisrokc in forum Yamaha PWC Performance (2-stroke)
    Replies: 10
    Last Post: 06-06-2006, 06:04 PM
  5. Loosing RPMs....help
    By johnD in forum 4-Tec Performance
    Replies: 19
    Last Post: 05-29-2006, 03:01 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •