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  1. #1

    4 Stroke High performance

    I am looking into transplanting a Yamaha 1052cc 4 stroke engine into a GPR hull. I would much rather use one of the new 1.8L currently available in the new SHO, but that just isn't an option right now, being that it is such a new engine.
    My concern is the size of the motor. It lacking a little in displacement vs. some of the other 4 stokes currently available from the competition.
    I really want to stick with a Yamaha power plant. Looking to go turbo or supercharger. Has anyone highly modified one of these engines with great results, or would I be wasting my time?

    Thanks in advance,

    CraigS


  2. #2
    Vern's Avatar
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    I think there are far better choices ... that motor is too small, revs to 10,000 rpm, has high compression (no good for boosting) and not much horsepower. The Rotax SC'd 4-TECS are proven in the GPR, install easily, tons of help available, tons of parts available and they make serious and reliable horsepower. If you are set on Yamaha power, I would most definitely wait until you can get the 1800 cc SC SHO motor ... but that won't be cheap or easy to get, mod, and fit up to the GPR driveline and hull. You will be the first to do it and will have to do some fabricating ...

  3. #3
    Hydrotoys's Avatar
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    Just wait for the SHO engine, if you are brand loyal. Lots of stuff coming, and I'm sure we'll see one real soon.

    I hear those GPRXP's can barely break 100. Such turds!

  4. #4
    It's not the destination, it's the journey!! Rip'nTear SHO's Avatar
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    Quote Originally Posted by Hydrotoys View Post
    Just wait for the SHO engine, if you are brand loyal. Lots of stuff coming, and I'm sure we'll see one real soon.

    I hear those GPRXP's can barely break 100. Such turds!
    lol....the GPSHO (or is GP1800R....which name is better?)...when some1 builds one...is a ski I would pay to ride..........but wait.....SHO is a 3 seater that thinks it a 2 seater...no need....:PLets see whatmagic the ECU can do......
    Last edited by Rip'nTear SHO; 05-27-2008 at 04:27 PM.

  5. #5
    Hydrotoys's Avatar
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    If we were to think that the SHO is even similar to a 2 seater, then that would mean we have no history, knowlege of what a cool ski a two seater is, or the difference from the 11plus foot barges that are being sold as 3 seaters these days.

    FYI the first "4 seaters", like the Genesis, SUV, and the Sd version were only about 6" longer than your new SHO. My how times have changed.

  6. #6
    Moderator OsideBill's Avatar
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    The SUV comes in at 12.5' L, 5' W, 44" H and weighs in at 818# dry

  7. #7
    Hydrotoys's Avatar
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    Yup, that's about the length of the Ultra/RXT/SHO, but much wider.

  8. #8
    Moderator OsideBill's Avatar
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    When my Son was 14 we could hand carry our Kawi 750 two seater to the water.

  9. #9
    It's not the destination, it's the journey!! Rip'nTear SHO's Avatar
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    Quote Originally Posted by Hydrotoys View Post
    If we were to think that the SHO is even similar to a 2 seater, then that would mean we have no history, knowlege of what a cool ski a two seater is, or the difference from the 11plus foot barges that are being sold as 3 seaters these days.

    FYI the first "4 seaters", like the Genesis, SUV, and the Sd version were only about 6" longer than your new SHO. My how times have changed.
    i know.....was just playin around.....small skis r terribly fun....the big skis have their place too....said it a 3 seater that thinks its a 2 seater performance wise.........but laws of physics dictate that large hull is not going to perform like a single or 2 seater hull.....i remember riding the kawi when it first came out and ski rentals began.......so we have a history of skis and no one is knocking 2 seaters but the fact is....that yamabarge is right with and/or beating most skis out there....ur right....times have changed

  10. #10
    SHO What????? jpack's Avatar
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    Quote Originally Posted by OsideBill View Post
    The SUV comes in at 12.5' L, 5' W, 44" H and weighs in at 818# dry
    Um Bill, that would make the SUV almost 16" longer & a foot wider. A greater distance between the sho & suv than the difference between the sho & the rxp which people on this forum claim to be so dramatic. You could not get me to go back to a two seater for ocean riding, but then again I am old & my back is shot....
    Mark I just started reading your thread on the first GPRXP, great read, got through 16 pages & had to give my eye's a rest....

    Jim
    Last edited by jpack; 05-28-2008 at 04:57 PM.

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