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  1. #1
    Mongoose's Avatar
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    Is GP800 THAT much slower thanGP1200?

    Thinking of getting a non runnng Gp800 as a project for a wave jumper.
    Looking at the old Riva data-Theres hardley anything between the GP800, and the Gp1200 up to about 45-50mph.
    Is this true, or are the figures misleading?
    Im thinking if it does get out the hole as quick, it would probably make a better surf boat-lighter, uses less fuel etc.
    Or the figures only half the story?
    Thanks


  2. #2
    Paradise rider aruba yamaha's Avatar
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    I'll go for the 1200. the 800 is a slower then the 1200. a good running 1200 should reach between 58 to 60 mph where the 800 is in the 53-55 mph. Other then that, we used to rent XL800 in the past and had a lot of problems with the engines. They didn't last long and we took them in less then 9 months out of our fleet. Problems with the powervalves and pistons getting stuck was the result. when that happens you have to replace the piston AND the cylinder (nikasil coating). Very expensive. The GP hull is great for jumping but they tend to crack the hull after a while. So reinforce the points where the straps, that hold the fuel tank,connected in the hull. I placed an stainless steel bracket between them to lock them so that they don't flex the hull.

  3. #3
    DAGO RACING CREW 97GPSLEEPER's Avatar
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    The 1200 accelerates much better than the 800 out of the hole. You also don't have to worry about the powervalves in the 1200. There is only about 3 mph difference in top speed between the two. There is 15 hp difference between the two and you can feel the difference out of the hole.

  4. #4
    Buaidh No Bas howestek's Avatar
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    My wifes stock gp800 runs about 56-57. Porpoised like crazy when we got it but fixed it easily. We have absolutely beat the tar out of it jumping waves and loved every minute of it. Its light enough that you can toss it around easily. Enough so that I wished I had taken dramamine several times. I have not run a gp1200 in the surf, but I would guess that it will launch a hair better, but be a hair less playfull cutting in and out of rollers.
    No problems to report with the hull from jumping but I have broken the nozzle control wheel (cheap). Fuel consumption is a hair less than my 1300. Oil consumption is much greater than my 1300. Valves need the waveater clips.

  5. #5

    Gp 1200 smokes the Gp 800 out of the hole

    , but after that the 1200 is not that much faster than the 800. To me the 800 feels super light compared to the 1200. It's hard to keep the 800 hooked up.

  6. #6
    cfgp927's Avatar
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    With the right combination of plate, intake grate, sponsons, the 800 is no more difficult to hook up than a 1200. If it was me, and I could buy the 800 cheap enough, I'd buy it and build a BB 66e motor for it and have the power of a stock 1200, the nimbleness of an 800, and more smile factor for jumping waves without the worry of hull damage. If you want it to accelerate like a 1200, put a 1200 pump in it. JMO. I've got two 927cc gp800's.
    Mike

  7. #7
    Go for the 1200. It has much more "grunt" for wave jumping. I owned a 1200 and rode several 800s.

  8. #8
    Old Ski Insanity w/rpm500's Avatar
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    look at the fact its a cylinder shy ,so weight will be less ( does this carry a smaller fuel tank too?) ... it will have to run higher in the water making it able to be 'horsed' around with bodyweight more than the same hull 1200 ... now the pump size is a factor .. the bigger pump will put a larger load on the engine ,but if impellered properly,(utilise the twins quick responce) it will be able to process water thru the powerband ...a pump set up along the lines of a SJ stunt ski would make this a great rough water ride... the big bowl on that larger pump/impeller combo with a big grate might be all you would need.

  9. #9
    Old Ski Insanity w/rpm500's Avatar
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    so did you buy that 800 ski?

  10. #10
    Dave Sharp dav_dman's Avatar
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    Quote Originally Posted by cfgp927 View Post
    With the right combination of plate, intake grate, sponsons, the 800 is no more difficult to hook up than a 1200. If it was me, and I could buy the 800 cheap enough, I'd buy it and build a BB 66e motor for it and have the power of a stock 1200, the nimbleness of an 800, and more smile factor for jumping waves without the worry of hull damage. If you want it to accelerate like a 1200, put a 1200 pump in it. JMO. I've got two 927cc gp800's.
    Mike
    groupk setup is rock solid..that idea sounds good.

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