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  1. #1

    08 Gpr w/mods slower than stock help please!!!

    I'm new to this site but i have an 08 1300r with 18 hours on it and my mods are 14/20 dynafly Riva Intakegrate Ride plate and trim tabs and pump seal kit.. My friend has the same ski completely stock and we raced before with just my ride plate and intake grate and i would always walk him... Now i put the prop and tabs on it takes forever to get out of the hole and he blows be away and i cant even catch him... Is this prop to aggressive for my motor please help.. thanks... oh and i plan on doing motor mods this winter..


  2. #2
    i'm not a specialist but i think 14/20 prop is too high for a stock gpr .
    i thing 13/19 is the way

  3. #3
    Never say never KirkF350's Avatar
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    You have too much prop. You need some engine mods before you can turn that thing. You need a tach to monitor you RPMs too. I would not run that ski any longer with that prop.

  4. #4
    callen, welcome to the board!

    extended trim tabs will cost mph, as will the grate in certain conditions. sounds like the prop is to steep, stock motor will not benefit from that. kinda hard to tell if your getting max RPM`s from the stock gauge/tach...

  5. #5
    Quote Originally Posted by KirkF350 View Post
    You have too much prop. You need some engine mods before you can turn that thing. You need a tach to monitor you RPMs too. I would not run that ski any longer with that prop.
    what do you mean by you would not run the ski anymore what damage could i do?

  6. #6
    also when i called riva they recomened this prop to be the first mod i did and i thought the prop was to steep but they assured me it would be fine

  7. #7
    Never say never KirkF350's Avatar
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    If you knew your RPMS, you "could" be ok; but not knowing what your RPMS really are is not a good thing. With this much prop, you could be over loading the motor and "could" cause detonation. If you run it below 7000 rpms, you will not have the performance you want and you could do some damage. To me, it is not worth the risk.
    Just for grins, put your stock prop back on it and go ride and see how the ski acts. Oh, and the riva tabs will slow you down. I would put the stock tabs back on too.
    Just my $.02

  8. #8
    true, but is he set up for rough water?

    What type of riding do you do and what are the conditions?

  9. #9
    Well this is actually my last riding weekend til next season i think i'l take off the tabs buy a mini tach and what is the best engine mods ( I mean external) you guys would reccomend? oh and for some reason this thing porpases uncontrolably and cant even get it to hook up anymore

  10. #10
    Quote Originally Posted by Pale Rider View Post
    true, but is he set up for rough water?

    What type of riding do you do and what are the conditions?
    I live on the chesapeake bay in maryland and the conditions change all the time one day it will be glass out and the next 8 to 12 inch chop mostly is about 4 inch chop

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