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  1. #1

    R&D anticavitation cone gp1300r 2007

    Hello,
    the cone anticavitation r&d gp1300r of 2004 amounts you it on gp1300r of 2007?

    Having make the assembly on my gp1300r of 2007, the cone anticavitation is smaller than the pump, is what I can navigated like that or I would have problems?
    Thank you for your answers.


  2. #2
    Prism's Avatar
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    The 2004 pump and the 2007 pump are different. I would not recommend trying to use the wrong cone

  3. #3
    then I must not mount the cone of 2004 on a 2007?What impact on the jetski and the pump ?thank you

  4. #4
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    do not mount a 2004 pump cone on a 2007 ski.

  5. #5
    Prism's Avatar
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    It probably won't perform very well and top speed will suffer. I don't think it will hurt anything to just try it, but to tell you the truth, I never thought the 2004 cone would fit on a 2007 pump. The cone should match the hub size of the impeller. If they don't match, I believe performance will suffer. If it does bolt on there, make sure water can't get to the pump bearings and the pump bearings remain sealed. Why do you want to try this? Are you not turning enough RPM? It's easier to change the size of the exit nozzle for final rpm tuning instead of the pump cone. I even tried an "adjustable" pump cone that varies in size with engine rpm but the stock cone always gave me the highest speed. I have the adjustable thrust cone sitting on the shelf in the garage. I tested it every which way I could, but no gain.

  6. #6
    OK thank you for your answer, I wanted to try the cone anticavitation of the 2004 because my friend to lend it to me but it is smaller that hubs of the pump thus I am going to lose in performance in spite of it amounts over a 2007.
    Which size of exit nozzle have to I have for top speed?
    87 mm or 85 mm with dinafly propeller 14/20?

  7. #7
    Prism's Avatar
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    Usually an 85mm is the one to use. I set my ski to run good rpm in the cool weather with an 85mm 5° nozzle. When it gets really hot and the rpm goes down I switch to an 87mm 5° nozzle. For rougher water I use an 87mm 3° from an XLT1200.

  8. #8
    OK for the nozzle 85 mm but how obtain you 5 °?
    With holds ?
    Thank you again.

  9. #9
    Prism's Avatar
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    GP1300R came with 85mm 5°up nozzle
    GP1200R came with 87mm 5° up nozzle
    XLT1200 came with 87mm 3° up nozzle
    You can increase the nozzle bore size with a hone or I've heard a ridge reamer will work. You can set it from 85mm all the way up to about 90mm if you wanted, and every size in between. I've never needed bigger than 88mm though.
    5° or 3° is the number of degrees in rise the nozzle mounts to the hull. 5 rises the nose of the ski more than 3 degrees.

  10. #10
    Prism's Avatar
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    They also make pump wedges to make the nose ride even higher than 5 degrees. Do a search for " Leo's pump wedges" for details.

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