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  1. #1
    Legend in my own mind Sirhc7897's Avatar
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    Carbon Fiber GSX (Polaris 1200 Powered) Project

    So just so everyone knows up front...this will be a slow moving project. I intend to work all the bugs out this coming summer, use the winter to build the motor as I want it (and any other little discovered things along the way) and then unleash the true beast the next summer. I really have no expectations for it as I don't really have any idea of what to expect out of the combination which brings us to the project:

    -Rare carbon fiber Sea Doo GSX hull: (standard GSX top deck) with fixed trim extensions, 155mm pump, etc...Lots and lots of little goodies on this thing. Back in the day it was a full blown superstock race boat (until carbon fiber was no longer allowed). As you'll see it in these pics it weighs well under 150lbs and can easily be moved around by a single grown man...
    -1200 Polaris motor: coupled with race team triple pipes (not your garden variety factory pipe triples...these things make huge power but require huge rpms, lots of gas and love all the compression you can give them)...Right now motor will be stock for testing purposes but ultimately will end up at the Sharp's for "conversion"...At this point conversion looks to be the following (but is certainly subject to change):
    -1200 full circle crank
    -Sharps / Jay @ Atlantic Head
    -MSX cylinders
    -Wiseco pistons
    -Case work
    -Maybe something totally different and radical that is still in the very early stages but may be available by the time I actually build it...

    Naturally this motor will have all the supporting mods...big carbs, reeds, etc...For this initial testing it's getting a set of 46mm Buckshots but will quite likely end up with a set of 48mm Novi's long term...

    First couple pics are of the GSX exterior and gutted hull...
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  2. #2
    Legend in my own mind Sirhc7897's Avatar
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    OK here are pics of the interior of the GSX hull stripped and prepped (and discoloration is due to the fact that it just got a bath and hadn't completely dried out yet...)
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  3. #3
    Legend in my own mind Sirhc7897's Avatar
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    Just for starters I dropped the bare 1200 motor to see what initial fitment issues I was going to have:

    Looks like the motor is going to require I fabricate some custom cross bars as the stock ones sit the motor too high...However, there is plenty of room under the hull as without the motor mounts in place the centerline of the crankcase is lower than the centerline of driveshaft meaning I just need to get enough rise out of the crossbars to slide in motor mounts...This is the next hurdle and I will begin measuring up for these tonight...
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  4. #4
    Legend in my own mind Sirhc7897's Avatar
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    So the next hurdle is coupling the Polaris motor to the Sea Doo pump...As you can see the driveshafts are obviously different...
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  5. #5
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    scoot that motor back as far as you can, that hull rides better on the back half...

  6. #6
    Legend in my own mind Sirhc7897's Avatar
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    So with the obvious difference in coupling betwene the two brands the question becomes what is the simplest way to solve the dilemna...In steps the Masters...CrazyA and his tremendously gifted father and boy what they whipped up was a doozy:

    A one of a kind driveshaft coupler (made from a heavy duty Polaris unit and the Doo unit) threaded on one end to mate to the Polaris crank and splined on the other end to accept the Sea Doo HX driveshaft this thing uses (because that's a added twist that this thing does not use the GSX driveshaft...)

    These boys do some pretty work...
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  7. #7
    ph2ocraft's Avatar
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    That's an excellent looking hull!
    This is going to be a nice project to follow and man that carbon fiber looks killer.
    You looking at total speed numbers or a little speed, quickness and handling?

    I think it's cool they even installed the zirk fitting with the coupler, nice touch.

  8. #8
    Legend in my own mind Sirhc7897's Avatar
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    Quote Originally Posted by ph2ocraft View Post
    You looking at total speed numbers or a little speed, quickness and handling?
    This is a good question as I really don't know...

    I do know that with the 951 motor, stock pipe and big buckshot carbs it had a holeshot as good or better than my Stage II RXP (or my triple piped SLX which was stronger than the RXP) and topped out at about 60...With the factory twins it had a mind blowing holeshot and topped 66ish...

    You figure the motor as it will go in for testing will be in the 200hp range and the final motor will be well and beyond that so who knows?

    Throw into that I have heard this hull style does not do well above 70 but who really knows...

    Tons and tons of unanswered questions and variables...


    But let's just say that for what I want to be able to do with it blistering acceleration and anything in the 75 rnage (all said and done) would thrill me...If it can go even faster that's just icing on the cake...I took my 78mph RXP to some drags last summer and got ate alive out of the hole by people set up for drag's...This is going ot be my drag ski...

  9. #9
    Water Bum Rodneyae's Avatar
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    That's just killer!! Take lots of pics and keep us up to date.

  10. #10
    Moderator beerdart's Avatar
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    Fiberglass/Carbon fiber is repairable but performance is Priceless. The words of Master Randy.

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