View Poll Results: More bottom end and mid range power or top end power & higher top speed on GP1300R?

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  • More bottom end and mid range power

    8 57.14%
  • More top end power and higher top speed

    6 42.86%
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  1. #1

    Join Date
    Mar 2010
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    Holland PA
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    What are the best performance mods for a 2004 GP1300R?

    I just bought a 2004 GP1300R. It had low compression in 2 of the cylinders so I rebuilt the top end on the motor since the bottom end was in great shape. I also put a R&D Plate in it with the sensor chip and the wave eater PV clips and couplers, but I want to add more bottom end and mid range power to the ski along with increasing my top speed and power. Increasing the top speed and power of the ski is my secondary concern. I donít want to lose what already there in the process of making the bottom end and mid range more powerful. I hear about adding a Riva Yamaha ride plate, 14/20 impeller and the aftermarket 87mm nozzle instead of the stock 85mm nozzle but wasnít shore. What other part should I add too?
    Thank You
    Amf133


  2. #2

    Join Date
    Apr 2006
    Location
    South MS
    Posts
    1,095
    Just depends on how far your willing to go with it.

    For a ride plate, contact JIM Performance on this site. This is probably the best mod for speed.

    Basic first mods-

    1200 intake grate- for safety and better holeshot and hookup
    Seal the pump shoe to get rid of cavitation

    The 87mm nozzle is easy to change and might make it feel stronger in the midrange.

    I would not put a 14/20 prop on it unless you do some more engine mods, without mods it will make it feel lazy.

  3. #3

    Join Date
    Mar 2010
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    Holland PA
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    Should I change the impeller with the 87mm nozzle or should I leave the stock one? If I do change the impeller which one should I get? Where do I buy the seal for the pump shoe and the 1200 intake grate?
    Thanks
    Amf133

  4. #4
    WATER WOODY's Avatar
    Join Date
    Aug 2005
    Location
    Minden, Nevada, United States
    Posts
    10,664
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    amf.....welcome to GH. Please take the time and do lots of reading. The search feature will answer most everything.

    Safety first...

    pump tunnel reinforcment
    1200 intake grate

  5. #5

    Join Date
    Mar 2010
    Location
    Holland PA
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    239
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    Where can I buy a pump tunnel reinforcement and what does it do? I been working on ATV’s all my life and am not to familiar with jet ski performance, but I love learning new things and working on my toys.

  6. #6
    WATER WOODY's Avatar
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    Aug 2005
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    Minden, Nevada, United States
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    Call me tomarrow bro and i will help you out with your questions. Takes way too long to type. 775-315-0222 kevin

  7. #7

    Join Date
    Mar 2010
    Location
    Holland PA
    Posts
    239
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    Thanks man I really appreciate it. Ill call you around noon.

  8. #8
    Have the head shaved for more compression, add free flow exhaust, install 14/20 dynafly, VF3 reed valves with spacer plate=a lot more BANG!

  9. #9

    Join Date
    Mar 2010
    Posts
    15
    Woody Porting

  10. #10
    zx11rider's Avatar
    Join Date
    Jun 2009
    Location
    Cape Coral
    Posts
    1,132
    Quote Originally Posted by NCfilmer View Post
    Woody Porting
    +1 a ported topend will do the job

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