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  1. #1
    TuningForkMarine's Avatar
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    03 GP1300R jet nozzle diameter question.

    Hai gaiz ...

    got a 03 GP1300R, current mods are as follows:
    Riva intake grate
    Riva rubber pipe Exhaust thingie
    Riva EFI controller (dont need one but have one for future head milling but not yet)
    R&D ride plate
    Cat delete / D plate
    Riva 14/20 Prop

    I heard that Stock GP1300R nozzles are 85mm
    and 02 GP1200R are 87mm

    my question is, which one is better on a GP1300R?

    many thanks in advance.


  2. #2
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Quote Originally Posted by bystrov View Post
    Hai gaiz ...

    got a 03 GP1300R, current mods are as follows:
    Riva intake grate
    Riva rubber pipe Exhaust thingie
    Riva EFI controller (dont need one but have one for future head milling but not yet)
    R&D ride plate
    Cat delete / D plate
    Riva 14/20 Prop

    I heard that Stock GP1300R nozzles are 85mm
    and 02 GP1200R are 87mm

    my question is, which one is better on a GP1300R?

    many thanks in advance.
    if you run a solas impeller use the 87 mm

  3. #3
    TuningForkMarine's Avatar
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    It's made by solas but it's a riva 14/20 prop

  4. #4
    powerstroke specialist mikegp's Avatar
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    w/o the increase in compression, that 14/20 is going to be too big. rpms are going to drop significant and it will be real slow.
    my 2c

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  6. #5
    CJ's gpr's Avatar
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    I have the 14/20 and its horrible for my stock ski. with the prop that adds speed to a modded craft it actually takes away speed from a stock ski since the engine can't turn it. this winter im going down to a 13/19.

  7. #6

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    The 87mm will give it a few more rpm and make it feel more responsive. If you have trouble turning the 14/20 I would add more power.
    Run open air box, advance the timing (keyway), mill heads or a set of reeds will wake it up for sure.

  8. #7
    TuningForkMarine's Avatar
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    Quote Originally Posted by Ronn25 View Post
    The 87mm will give it a few more rpm and make it feel more responsive. If you have trouble turning the 14/20 I would add more power.
    Run open air box, advance the timing (keyway), mill heads or a set of reeds will wake it up for sure.
    Getting my head shaved this week, gonna bring it up to 150psi, and adding a flame arrestor with more air supply in to the hull. Finally my efi will actually be out to good use.

  9. #8
    OzarkYamMonster's Avatar
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    Keep @ It !!! I am now on the back side .... and rounding 3rd I have now got the heads milled (150 psi), 4* key way , Jet works hole shot valve, Dyna 14/20, SS800 grate (cut to 1200), Pump shoe stuff kit, R & D ride plate, Pet 2100 tach, ... and power shot fuel controller. Its now tune ... tune ... tune, trying to get the max rpms by tuning the fuel controller. I did solve my hole shot problem & my mid-range is outstanding. Just want to crack the 70 mph gps #'s. Spend now about $1200. getting here ... my max RPMs is @ 7040, WFO says should get 7100 to 7200 + . It is my belief that if I can find that elusive 160 rpms .. I will crack the 70+ gps. Any advice would be helpful

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