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  1. #1
    kham383's Avatar
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    Aussie GP1200R Lean Jetting Help?

    Hi i have a Australian 00 GP1200R im rebuilding. I am pulling my hair out over the jetting. These are the mods i will be doing over the next week.

    Prox pistons
    3 x new cylinders ported exhaust ports
    ADA head 35cc domes
    Oil pump block off plate
    Wave eater power valve kit
    Rive air filters/flame arrestors
    TDR jet spray water box
    Riva free flow pipe
    Carby rebuild kits
    it has d plate stock

    00 gpr 1200 Aust stock jetting.
    92.5 pilots
    135 mains
    115 gram spring
    1.2 n/s

    I have a set of
    110 pilots
    120 mains
    1.5 n/s
    95 & 80 gram springs
    Which i was going to install. But my local pwc mechanic reckons it will be to lean. He recommended to install stock 92.5 pilots,145 mains & 1.5 n/s

    This is my thinking 92.5+145=237.50 at WOT or 110+120=230 at WOT
    but i don't know if that is correct.

    Also the aussie GP1200R has 3 accelerator pumps which i was going to disconnect & use a primer kit.

    I have read allot of threads on the subject but still cant get my head around it any help would be very much appreciated.

    Hull mods
    Riva ride plate & R&D Ride Plate
    trim tabs
    R&D Aquavein Intake Grate
    Solas YF-CD-13/19
    R&D Pump Seal Kit


  2. #2

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    ring this guy

    Stop mucking around with all of that just ring this guy in Sydney...Todd at Jetworx Marine 0298243322, expert and the best

  3. #3

  4. #4
    Moderator OsideBill's Avatar
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    I would go with this set up and you will be just fine.


    Remove or disable accelerator pump.
    remove choke plates
    110 pilots
    125 mains
    1.5 needle and seats
    95 gram springs
    pop-off 42-45 psi
    1 turn out on the low speed screw
    1-1/2 out on the high speed screw

    I have set up many 1200 skis with this and it just plain works. similar if not exactly the same mods as yours. Leave the low speed adjusters alone and dial the highs in with a digital tach. find the highest rpm then back it out 1/8-1/4 turn for safety.

  5. #5
    BoostCrzy's Avatar
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    135 mains stock?....i dont think they came with anything but 117.5 mains stock.....at least all the ones i have seen were 117.5 mains...

  6. #6
    Moderator OsideBill's Avatar
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    Quote Originally Posted by BoostCrzy View Post
    135 mains stock?....i dont think they came with anything but 117.5 mains stock.....at least all the ones i have seen were 117.5 mains...
    sounds like old GP SBN carb specs to me

  7. #7
    either Aussie had different jetting specs ( i only see usa jetting online) or he's mistaken about jetting?
    Last edited by ZMANN; 07-04-2008 at 11:06 AM.

  8. #8
    Hydrotherapy's Avatar
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    its a 1200pv if his avater is his ski..

    uk and down under had some weird spec carbs for the 2000 gp1200r
    my buddy gpr dean has one and the linkages were diffrent as i remember

    go with osidebill he wont be wrong on your set up

  9. #9
    kham383's Avatar
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    Thanks everyone i will run those specs osidebill recomended.

    Another question a friend has a brand new R & D Dominator Manifold and R & D m16 Reed Valves for $200.
    How do these proform & would i have to up the jet sizes once again.

  10. #10
    Hydrotherapy's Avatar
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    Quote Originally Posted by kham383 View Post
    Thanks everyone i will run those specs osidebill recomended.

    Another question a friend has a brand new R & D Dominator Manifold and R & D m16 Reed Valves for $200.
    How do these proform & would i have to up the jet sizes once again.
    M16 reeds are worse than stock i will take them to make my other ski slower j/k..

    jokes aside thats real good money for them,pull his arm off,do a search on m16 reeds

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