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  1. #1
    mrbtd's Avatar
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    mrbtd's GPRXP conversion

    First of all a special thanks to Hydrotoys,Lvnspeed, Jeffsntx, GPRXP Steve and the many others that have shared so much information with their projects. There is no way in the world a Systems Analyst with very little mechanical experience could do this without you guys.

    My 10 hour GPR let go in the last 15 minutes I was down @ Mudbug. I didn't let it bother me that much because I new it was nothing more than an opportunity to do something new.

    I bought a bone stock RXP @ the end of June and rode it through the first week in September. After the 4th of July I couldn't help myself and started modding the RXP with a 4" Intake, Greenwheel and Grate. It ended up a 73 MPH ski by the time I was done. It was hard to take apart a perfectly good RXP but I knew it was the only way I could do a conversion.

    As of today I have EVERYTHING except the mid shaft support. I have a friend making something up for me. I hope to be on the water sometime in the next couple of weeks.

    For this Fall it will just be the motor I ran in the RXP with a 14/20 DF pitched as needed.

    In the spring/winter I will install the ET-137, XS Inter-cooler and address the Valvetrain and Valves. No plans for an aftermarket ECU but you never know .


  2. #2
    Moderator RX951's Avatar
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    awesome !! Share plenty of pics too bro !

  3. #3
    mrbtd's Avatar
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    And now the porn....This is how it started.
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  4. #4
    mrbtd's Avatar
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    This is how it ended up
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  5. #5
    mrbtd's Avatar
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    Gas tank fit in nicely much to my surprise. I did end up pushing in the corners maybe 3mm just to keep it off of the hull in the front.

    To push them in all I did was heat up with a basic heat gun. I pressure tested it afterwords and had no leaks.

    Practiced on the GPR oil tank I had in the shed .
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  6. #6
    mrbtd's Avatar
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    MPEM Bracket is in front. My first experience with a Rivet gun (really was). It clears the storage bucket with no modification.

    I really fought the Battery cables on this. My battery is mounted in the back of the motor so the positive cable needs to be about a foot longer. I didnt know anything about wire gauges lugs and splices until this was done.

    Even after reading it about 1000 times in the from Hydrotoys How-To thread I realized when the motor was in the battery NEEDS to be in back of the waterbox. Especially if using an aftermarket I/C. I plan to get it back there in the spring.

    I kept fighting changing the connection mounted to the MPEM since I didnt know what it was.
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  7. #7
    mrbtd's Avatar
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    Here is the GPR naked with the hull cuts. The bottom was cleaned up by icerat's crew. They did a nice job. The white is brite and the black is black. Not sure what I will do for graphics. I like it simple so probably a couple of OEM Rotax stickers.

    If I had to do this over I would of copied what I saw in one of Dukes threads. After the hull cut backfill with expanding foam then cut a piece of the SMC left from the upper cut and make a triangle to fit.

    Will get some better pics of the hull tomorrow.
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  8. #8
    mrbtd's Avatar
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    The gauges turned out great. Beerdart and boostaholic showed us all how to melt and mold the plastic to fit the gauge. I did not have to touch the hull when installing.

    I did run into a little trouble when installing the rubber gasket. It seemed to push up and out a little so there is a small gap in the middle. I plan to fill with RTV or similar.
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  9. #9
    Moderator RX951's Avatar
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    did you use a heat gun to make the two humps so the guages look like a contour fit? what else did you use. it looks good

  10. #10
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    When finishing up the vent lines for the fuel tank I broke off the vent line. It is part of the fuel pump . After freaking out I decided to use this fitting for the vent line. Believe it or not this little mistake cost me about 6 hours.
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