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  1. #1
    Bartlesville OK syclonedriver's Avatar
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    Jul 2008
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    2mph & 100rpm for $25

    My first post didn't make so this one will be a little shorter.
    Indexing plugs is worth about 10 - 20 rpms.
    Pulling the slack out of the trottle cable is worth 80 - 90 rpms.
    Rpms from 6970 to 7080.
    Speed from 60 to 62 mph gps.
    Started with full tank of gas.
    R&D grate & plate shimed down with 1 washer to control ride, need to add 1 more washer.
    Riva trim tabs.
    Weather was a hot 95deg.
    Rider 230lbs & old.
    I managed to find some calm water to test on.

    More testing to be done soon.
    Troy


  2. #2
    WATER WOODY's Avatar
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    Aug 2005
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    Minden, Nevada, United States
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    Welcome to GH.Looks like you have found some more speed in your throttle cable and setup.Keep up the good work.

  3. #3
    Good job not forgetting the basics, many times they are overlooked..Welcome

  4. #4

    Join Date
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    You shimmed down the intakegrate?
    ive never heard of this!! i actually milled mine down so that it fits even with the pump shoe!!! did i screw mine up?

  5. #5
    If your not doing something, its hard to screw up. stlouisramsfan's Avatar
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    Quote Originally Posted by syclonedriver View Post
    ...R&D grate & plate shimed down with 1 washer to control ride, need to add 1 more washer..
    Troy
    I think he was just combining the 2 into one sentence, no shim under grate....

  6. #6
    Bartlesville OK syclonedriver's Avatar
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    I shimmed my plate down in the back to control porpoising. I just changed the shim from .030 to .070.
    I am going to fill the holes in the shoe & grate next.
    At the lake I will do some trimming to get some more air into the hull.
    I may have to shim the trim tabs down. I have Riva tabs shoud these be shimmed down?
    Last edited by syclonedriver; 08-03-2008 at 06:48 PM. Reason: clarity

  7. #7
    Moderator RX951's Avatar
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    League City, Texas
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    welcome to the forum

  8. #8
    Yellow93's Avatar
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    San Antonio, Texas, United States
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    I have Riva tabs shoud these be shimmed down?
    No they should be cut to stock length!

  9. #9

  10. #10
    Bartlesville OK syclonedriver's Avatar
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    Jul 2008
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    did some more testing

    I did this a few days ago.
    I lowered the back of the ride plate some more and crued the porpoising. I filled the holes in the pump shoe & intake grate.
    The weather was a little cooler low 80s.
    Had about 3/4 tank of fuel.
    I used the peak speed feature of the gps unit this time so my test method changed a little. I am using an old Cobra gps500 and it stinks.
    The peak rpm is more consistant after adjusting the throttle cable for wot. RPM peaked at 7110 & peak speed was 62.6 but I'm not sure I trust that gps unit.

    I did this today.
    I opened up the hull to get a little extra air flow by cutting away some plastic on the right side.
    The weather was cooler still mid to low 70s.
    3/4 tank of fuel.
    The motor was a little cooler than the previous tests.
    Peak RPM was 7180 to 7190.
    I did not get any speeds, the lake was too rough. That and I got hurt jumping wakes. Don't jump with metal framed glasses.

    This thing is getting faster!

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