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Thread: GP1300 mod help

  1. #1

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    GP1300 mod help

    Hi all, im new to the forum. I have a Gp1300r '06. ive always been wanting to mod it and get it to atleast a solid 78~80mph. I know theres thousands of threads that tell you how to do so but all are diff. Just wanting to see if someone could compile a list of mods that i would need to start out with(to get to around 73~75), then eventually to 78~80. i already have a cat removal. i have alot to learn but this place seems really helpful and im open to learn anything. thanks in advance! Yamaha All Day


  2. #2
    You are lucky in that all the testing has been done by others before you. Start by reading the stickies at the top of the forum. It may be time consuming but it is a hell of lot easier than testing parts yourself.

  3. #3
    Tommy Pantsdown's Avatar
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    Everyone here is really helpful, there's a massive amount of GPR knowledge among these guys. I've always thought a GPR mod guide would be a nice sticky thread for new people and old people as well, a nice reference tool. Maybe a few members could work on that from this thread. Maybe one for EFI and one for carbed.

    To get to 73-75, start with the basics. Intake grate is just as important as getting rid of that cat. Plug kit and seal the pump shoe while you're down there. I'll let others take over the thread from here.

  4. #4

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    Does anyone know if the Level 1 kit from island racing would be a good idea to get? Or would picking out specific parts and building my own kit be more beneficial?

  5. #5
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    Quote Originally Posted by MindTrickzZ View Post
    Does anyone know if the Level 1 kit from island racing would be a good idea to get? Or would picking out specific parts and building my own kit be more beneficial?
    there are far better ways of spending your coin then on kits.

    starting with your hull;

    riva 1200 dual bar grate.
    pump plug kit
    seal the shoe ( make sure its set right or it will slow you down)
    upgrade inserts for shoe and grate
    pump tunnel reinforcement ( a must)
    solas 14/20 prop ( pitch to suit rpm's with the aim being 7200 rpm at WOT, meaning about 14/23 pitch- www.impros.com does the best work with props)
    (service your pump while your in there, it wont hurt it)
    jim's modded r&d ride plate with correct angle set
    remove siphon tube and fill void ( gets rid of the rooster tail and picks of a few rpm)


    engine mods;

    3 degree keyway ( the engine has to come out to install this)
    vf3 reeds
    machine your stock head for 155PSI compressions ( ask osidebill for help here)
    lowells vf3 gaskets
    fuel controller
    port your cylinders ( lowell horning does the best work here)
    1 x PET tach so you can see your rpm's and tune.
    ross's sonic boom throttle bodies

    Hull mods;
    Cut fairings for more air flow
    Cut storage bucket for more airflow or just pull it out when you want to run it hard.

    if you want some bling as well, replace the stock steering setup with a UMI system and after market bars like renthals and odi grips and a UMI throttle and you might as well get a new seat cover from mline or riva etc...

    those mods will get you close to 77mph, the rest is in the tuning of the hull, tabs, plate etc...which will get you to 80.

    hope this helps.

  6. #6
    Almost's Avatar
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    Quote Originally Posted by izz0 View Post
    there are far better ways of spending your coin then on kits.
    That's why Carl made his own kit without all the unnecessary parts that come with the Riva kits.

    The kit is only 4 things, unless you want more.
    R&D Rideplate
    R&D Aquavein Intake Grate
    Solas Dynafly Impeller YG-DF 14/20
    R&D Pump Seal Kit


    Either way its just the very basics and is not going to get you even close to 77-80.

  7. #7
    L Carlson's Avatar
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    Quote Originally Posted by izz0 View Post
    there are far better ways of spending your coin then on kits.

    starting with your hull;

    riva 1200 dual bar grate.
    pump plug kit
    seal the shoe ( make sure its set right or it will slow you down)
    upgrade inserts for shoe and grate
    pump tunnel reinforcement ( a must)
    solas 14/20 prop ( pitch to suit rpm's with the aim being 7200 rpm at WOT, meaning about 14/23 pitch- www.impros.com does the best work with props)
    (service your pump while your in there, it wont hurt it)
    jim's modded r&d ride plate with correct angle set
    remove siphon tube and fill void ( gets rid of the rooster tail and picks of a few rpm)


    engine mods;

    3 degree keyway ( the engine has to come out to install this)
    vf3 reeds
    machine your stock head for 155PSI compressions ( ask osidebill for help here)
    lowells vf3 gaskets
    fuel controller
    port your cylinders ( lowell horning does the best work here)
    1 x PET tach so you can see your rpm's and tune.
    ross's sonic boom throttle bodies

    Hull mods;
    Cut fairings for more air flow
    Cut storage bucket for more airflow or just pull it out when you want to run it hard.

    if you want some bling as well, replace the stock steering setup with a UMI system and after market bars like renthals and odi grips and a UMI throttle and you might as well get a new seat cover from mline or riva etc...

    those mods will get you close to 77mph, the rest is in the tuning of the hull, tabs, plate etc...which will get you to 80.

    hope this helps.
    Great advise Izzo!!!!!!!

  8. #8
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    Quote Originally Posted by Almost View Post
    That's why Carl made his own kit without all the unnecessary parts that come with the Riva kits.

    The kit is only 4 things, unless you want more.
    R&D Rideplate
    R&D Aquavein Intake Grate
    Solas Dynafly Impeller YG-DF 14/20
    R&D Pump Seal Kit


    Either way its just the very basics and is not going to get you even close to 77-80.
    those mods will not do a lot.

    Plate - this will give you + 3mph when setup at the correct angle
    grate - this will cost you speed but the hookup is way better.
    prop - a 14/20 can not be run on a stock motor, it would have to be re-pitched to 14/19 to hit 7100-7200 rpm.
    PPK - this also helps cavittion and hookup but will not make you faster.

    best case scenario that stage 1 kit might help you hit 69 mph or 70 if your real lucky.

    BTW i forget to add - with my mods listed in my above post above you need to step your sponsons.

  9. #9
    Altezza01's Avatar
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    Quote Originally Posted by izz0 View Post

    3 degree keyway ( the engine has to come out to install this)
    the engine does not have to come out to install a keyway. just the U-pipe.
    use a mirror and do everything in the mirror. make sure the keyway is in the right way or else you will retard your timing instead of advancing it.

  10. #10
    Matt Hill's Avatar
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    Keyway is cake. Everybody acted like it was going to be this horrible job. I found it to be quick and simple with the engine in the hull. While I had the front of the exhaust off I put my own air intake setup on the front, wiped down the inside of the hull, made a block-off for the oil pump, and did my pre-mix conversion. That was my first time working on a ski coming from an automotive racing background. Definitely don't be intimidated if you can turn a wrench.

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