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  1. #1

    Join Date
    May 2006
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    Orange Park, FL
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    23

    Is 67.6mph good for my setup?

    I know, nothing crazy here...it's pretty boring compared to many skis on this site.

    HOWEVER, I've finally got mine done to where I like it, and hit 67.6mph today (per my Garmin eTrex)...it's a 2000 GPR with ~75hrs.

    Mods:

    Stock motor GP1200R (w/ a home-made D-plate)
    I just rejetted the carbs to the recommended specs for a rec. boat...with the accel pump removed.

    R&D ride plate (out of the box, untouched)
    R&D 2-bar intake grate (the one with the scoop)

    ...and as of this last Friday, a Concord 13/19 impeller (thanks SHOOTER!)

    ...

    So - Does that seem right?

    I hit ~65mph before today...and the impeller made a HUGE difference out of the hole, plus the extra MPH up top.

    Plugs look good, and the RPM seems to be good per the stock tach (not very precise, I know).

    Any input is appreciated...thanks.

    - Brian


  2. #2
    Moderator RX951's Avatar
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    Apr 2005
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    League City, Texas
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    Thats about right ! pretty good

    stock compression ? you can get more speed with a little work on that rideplate.

  3. #3

    Join Date
    May 2006
    Location
    Orange Park, FL
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    Thanks for the reply - And yes, stock compression.

    That's the only thing I might change...I'll mill the heads a little, maybe someday.

    But for now...I'm set!

    I prefer to wave jump...and the impeller made that A LOT more fun...the top speed is purely a bonus!

    - Brian

  4. #4
    Fast1's Avatar
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    Dec 2005
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    Minneapolis, MN
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    97
    as a comparison..

    My 01 GPR with milled head, extended nozzle, 13/19 impeller, stock plate, stock jetting and ppk would turn 67.5 mph in cool (65 degree) weather.

    The additional compression really helped my 01 GPR. My ride conditions and use did not allow an aftermarket plate. The two bar 1200 top loader would aid acceleration but reduce top speed by 1 to 1.5 mph.

  5. #5
    MPower's Avatar
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    May 2005
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    Raleigh, NC
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    Send your plate to Jim and you will be knocking on 70.

  6. #6
    WATER WOODY's Avatar
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    Minden, Nevada, United States
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    Orian,you are right were you should be.

  7. #7
    PuprleNuprleGPR's Avatar
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    Jul 2006
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    Central FL
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    Thats pretty damn good...compared to my 04 1300 (90hrs). It goes 61.8 with 1200 grade, D-plate, and jetworks mod
    We'll see how its on the next outting with Jims plate and PPK, but pump not sealed.

  8. #8
    Orion, yours sounds about right.

    PuprleNuprleGPR, Yours has issues.
    When you do the ppk make sure the pump shoe is not hanging to low.
    Check to make sure your trim is tight and working properly.
    check for damage to the prop or an obstruction in the pump tunnel
    Make sure powervalves are functioning properly.
    Check compresion.

    Unless you weigh 800+ lbs there is something not right with your setup. Its running 3-4 mph below a normal stock 1300. Im sure its probably something simple holding you back.

    Do you know what RPMs its running?

  9. #9
    PuprleNuprleGPR's Avatar
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    Central FL
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    Quote Originally Posted by porksword View Post
    Orion, yours sounds about right.

    PuprleNuprleGPR, Yours has issues.
    When you do the ppk make sure the pump shoe is not hanging to low.
    Check to make sure your trim is tight and working properly.
    check for damage to the prop or an obstruction in the pump tunnel
    Make sure powervalves are functioning properly.
    Check compresion.

    Unless you weigh 800+ lbs there is something not right with your setup. Its running 3-4 mph below a normal stock 1300. Im sure its probably something simple holding you back.

    Do you know what RPMs its running?

    I will make sure that the shoe doesnt hang too low when I bolt it up. I can hear the powervalves opening/closing when I shut off the ski, so Im pretty sure thats not it. I am guessing the trim works, since I notice a diff. when jumping waves, when its in neutral or all the way up. Pump tunnel seems fine, and the prop also looks fine. I dont know my compression or RPMs. I've been thinking that its roughed up hull from beaching the ski, as well as a good sized gash in my rideplate from hitting a submerged rock. I could take some pictures to try and get it solved.

    Sorry, semi-jacking your thread, but as everyone has already said, you have a pretty strong ski (for its age atleast).

  10. #10
    BertInTexas's Avatar
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    May 2005
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    Albeit there are skis here that do over 80 mph,but 67.5 is nothing to sneeze at either! Far from boring. It seems like only yesterday I was riding my old 580 cc SeaDoo SPI at 45-50 mph thinking gawd this thing is fast. I do sometimes miss that lightweight hull though.My RXP feels like I am riding an engine block around in comparison.

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