Page 1 of 3 1 2 3 LastLast
Results 1 to 10 of 23
  1. #1

    Join Date
    Aug 2007
    Location
    Huntsville Alabama
    Posts
    16

    Mods to R&D GP1200r Intake grate

    Are there any improvments that can be made to a R&D Aquavein intake grate for a GP1200r? I am about to install one and I thought I should ask before I do that. The surfaces seem a little rough and the trailing edges are blunt. WOuld it help to smooth out or polish the surfaces and sharpen the trailing edges? I have a fairly stock ski right now but am thinking ahead where small mods could play a more important role in performance.


  2. #2
    My son (mohawk man) jeffsntx's Avatar
    Join Date
    Sep 2006
    Location
    Belton TX
    Posts
    2,598
    +1
    1
    The only thing I do to the grates on my skis are make sure it fits the pump shoe very well and does not hang down.

    I have seen SEVERAL grates that "rock" on a high spot of the grate when you put it up against the shoe. If your pump shoe is sealed in the hull, put the grate in place and hold it firmly in place by the center of the grate (approx where the wing is). Then press on the rear most portion of the grate. If it "rocks" back and forth, I find the high spot and file it down very carefully until the rocking goes away. Be sure that if you use the portion of the PPK that goes in the bottom of the shoe, it is trimmed level with the shoe.

    I believe that this rocking is due to several things:
    a) Poor quality control when casting the grates
    b) When you set the shoe, no 2 skis are the same.

    The above info was shown to me by another forum member, so I cant take credit for it. Several grates were put in the same boat and all were different, including one that had no front to rear rock at all.

    After I make sure that the grate doesnt rock, I bolt it into place and then file the rear of the grate so that it matches the shoe. You can also file/grind the top of the grate where it meets the shoe to be sure that the water flows nicely into the tunnel.

    I do not suggest doing anything to the grate. They are known for breaking, so any grinding/modification will be at your own risk.
    Last edited by jeffsntx; 10-04-2007 at 01:48 PM.

  3. #3
    All hail the Chief! fullboogie's Avatar
    Join Date
    Nov 2005
    Location
    Texas
    Posts
    3,155
    +1
    44
    Truly, here's your best answer - hit the search button. Lots of information about the lack of gains to be had and the potential for exploding grates from modding them. Read and enjoy.

    And don't listen to Jeff (above). He's in jail in Beaumont and has never owned a ski.

  4. #4
    Hydrotherapy's Avatar
    Join Date
    Sep 2006
    Location
    The Rock
    Posts
    3,347
    +1
    17
    Quote Originally Posted by zx9rpilot View Post
    Are there any improvments that can be made to a R&D Aquavein intake grate for a GP1200r? I am about to install one and I thought I should ask before I do that. The surfaces seem a little rough and the trailing edges are blunt. WOuld it help to smooth out or polish the surfaces and sharpen the trailing edges? I have a fairly stock ski right now but am thinking ahead where small mods could play a more important role in performance.
    or put you name to one of the great green grates jerry is getting made up for us lucky guys,thread in top of performance section,have a read and see what you think

  5. #5
    Hydrotherapy's Avatar
    Join Date
    Sep 2006
    Location
    The Rock
    Posts
    3,347
    +1
    17
    And don't listen to Jeff (above). He's in jail in Beaumont and has never owned a ski.[/quote]

    dont tell anyone what he is in for

  6. #6

    Join Date
    Aug 2007
    Location
    Huntsville Alabama
    Posts
    16
    I guess I was thinking that any mods that reduce the drag of the grate would LOWER the loads on it and thereby reduce the risk of a failure. Has anyone seen a crack form before a complete failure. If the crack started at the tailing edge then sharpening it would be a bad idea but if cracks started at the mounts or leading edge then sharpening the trailing edge should not be an issue. Being an Aerospace Engineer it is hard for me to look at the very crude and dragy looking grate and not try to improve it in some way.

  7. #7
    Hydrotherapy's Avatar
    Join Date
    Sep 2006
    Location
    The Rock
    Posts
    3,347
    +1
    17
    Quote Originally Posted by zx9rpilot View Post
    I guess I was thinking that any mods that reduce the drag of the grate would LOWER the loads on it and thereby reduce the risk of a failure. Has anyone seen a crack form before a complete failure. If the crack started at the tailing edge then sharpening it would be a bad idea but if cracks started at the mounts or leading edge then sharpening the trailing edge should not be an issue. Being an Aerospace Engineer it is hard for me to look at the very crude and dragy looking grate and not try to improve it in some way.
    an aerospace engineer should be looking to fit a jet unit not try to find speed in grates
    you could be our first 100mph man

  8. #8
    All hail the Chief! fullboogie's Avatar
    Join Date
    Nov 2005
    Location
    Texas
    Posts
    3,155
    +1
    44
    Again, hit the SEARCH button and all of your questions will be answered. This topic has been beat to death. Not trying to be rude or anything, but new guys (and old guys) are expected to do their own research before asking others - otherwise you just seem lazy.

  9. #9
    Happily Self-Employed WFO's Avatar
    Join Date
    Nov 2005
    Location
    Houston, Texas
    Posts
    12,801
    +1
    450
    You will have to excuse Fullbooger, zx9r...

    He hasn't been laid in a while.

  10. #10
    Grand Cayman Tanny's Avatar
    Join Date
    Dec 2006
    Location
    Cayman Islands
    Posts
    276
    lol lol

Page 1 of 3 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. FS (or Trade) -- RIVA GP1200R Intake Grate
    By Black Z-24 in forum Yamaha Classifieds
    Replies: 23
    Last Post: 03-25-2010, 09:55 AM
  2. 2002 GP1200r intake grate and ride plates
    By gp1200rrk in forum Yamaha PWC Performance (2-stroke)
    Replies: 0
    Last Post: 06-05-2009, 01:51 PM
  3. gp1200r intake grate
    By jprochnow in forum Yamaha PWC Performance (2-stroke)
    Replies: 9
    Last Post: 05-30-2009, 02:18 PM
  4. GP1200R Intake Grate question
    By ramairformula74 in forum Yamaha Open Discussion
    Replies: 3
    Last Post: 04-05-2009, 08:56 PM
  5. WTB - Riva or R&D GP1200R Intake Grate
    By Mike's GPR in forum Yamaha Classifieds
    Replies: 3
    Last Post: 07-02-2008, 04:47 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
  •