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  1. #1
    Eastside Powersports Slow 91's Avatar
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    Slow91's GP1300R Ported Top End

    I bought this ski in Feb of 2010 from Beerdart. It ran mid 73's when i bought it. The only mod i did was a custom Free Flow. In 90* Humid weather, it would run high 72's breaking into the 73's. Until 2 weeks ago when # 3 prox piston came apart and caused non fixable damage in the stock 1200 cylinder. I had purchased a TJ ported 1300 top end from N8r, was hoping to see some 75mph on the 1200 before i went 1300 but i never was able to reach that goal and was forced to put the 1300 top end on. Ordered some brand new PRO X pistons, Yamaha Gaskets, rejet the carbs, etc. I really wanted to thank Beerdart for the help getting this motor back together. We found multiple leaks while pressure testing it, and had to take the carbs on and off like 4 different time. I Finally was able to start it up today. Sounds VERY good. Here are the pics, these are the mods. Im hopin to reach 80mph, but i really want something that accelerates HARD.

    TJ ported 1300 top end, honed by Northeast Automachine ( my work)
    Riva Heads, Cut by TJ.
    Riva Gas Valves
    VF2 reeds
    Beerdart jetted carbs
    Nujet 6.5 Prop repitched
    Non Jims plate
    800 intake grate
    Proxs
    Advent Yam84 curve


    Here are some pics of the build:

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    Sorry for the poor quality pics, i didnt have time to take good pictures, i wanted this thing back together asap.


  2. #2

    Join Date
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    Nice! Thats a Strong 1300 top end. With a '05 pump and dynafly about a 14/23+ it should do 80mph no problem.

  3. #3
    WATER WOODY's Avatar
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    Nice, be sure to turn your gas valve caps 180 degrees from the 1 pictured.

  4. #4
    Eastside Powersports Slow 91's Avatar
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    Quote Originally Posted by WATER WOODY View Post
    Nice, be sure to turn your gas valve caps 180 degrees from the 1 pictured.

    Yeah, i clocked it once i put the others on. Everything went together very well and it sounds like a beast. I will def be in touch during the off season to get some work done woody.

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