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  1. #1
    Eastside Powersports Slow 91's Avatar
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    Questons about my GPR

    Ok, since i bought Beerdarts GPR, i have added only a free flow. Today my PET tach showed up so i went out for some #'s.

    Full tank of fuel, on the seat 78 or so degree air temp got me 7140 rpm's and 69.9-70.7mph

    Half tank, still on the seat, Air temp cooler...73-74 degrees i was getting 7180 and 72.7mph


    Basically i have a unported 1200, ADA Head 145psi, VF2's, Dynafly prop (not sure on the size) stock pump, free flow, 800 intake, Non Jim's plate. My question is, before i go and put on my Advent, and a start modding the ski more ( 1300 tj ported top end) i want to know if i have a solid starting point. I want to make sure im not missing RPM's or anything before i start adding parts one by one. thanks guys.


  2. #2
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    you have a very solid starting point and a very well tuned ski by the sounds of it.

    I did not get over 72 until i went to a 1300cc top end...

  3. #3
    Eastside Powersports Slow 91's Avatar
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    i bought an Advent from Tommy Jordan, and before i put it in i wanted to make sure i wasnt down on RPM's. So i will install the advent, with tha yam94 curve and see what i get from there. Id love a solid 75mph unported 1200 before i go with my ported 1300 top end.

  4. #4
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    the advent should add about 60-80rpm and the response will be wayyyyyyyyyyyyyyyyy better.
    .
    make sure you set the 94 curve up right with 7500 rev limit and leave the warning options on

    looking forward to your results, make sure you post them in this thread please.

  5. #5
    Eastside Powersports Slow 91's Avatar
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    Def will!!! thanks for the support. Im going to ride one more time today without the advent, and ill throw in the advent monday and go for some testing. Its supposed to be in the high 90*s air temp this week so im not sure how much that will effect my results.

  6. #6
    Moderator beerdart's Avatar
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    Your prop is a tweaked Nu-Jet

  7. #7
    Eastside Powersports Slow 91's Avatar
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    Update:

    Yesterday i took the ski out first thing in the am. Fuel on the buzzer sitting on the seat i was getting 7220 RPM was netting me 73.3 mph. Cruised around for a few after the run and all of a sudden out of a no wake zone it lost power and just shut off. If i hit the start button the starter tries to engage and nothing. I did notice the exhaust pipe and cylinder head were quite warm and almost hot. I know for a fact i didnt have an oil issue because im using my oil injection, AND running a 100:1 premix in the gas. Not sure if it siezed because of over heating or not. No buzzer or warning came on. Sooo i think im going to bring it over steves and start taking it apart. I still havnt gotten a chance to put the advent in yet.

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