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  1. #1
    Myself's Avatar
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    Homemade GP trim tabs

    Well, I hauled off some scrap and spotted some 1/4" thick aluminum plate brackets of some sort. I got a wild hair and figured I could probably cut some tabs out of it. So I bought a couple for $10. Our son rides on the GP1200 with my wife, anything to help the porpoising. I just barely got them cut out in between some slotted holes, whew. Here is a pic of them roughed out. So far just a sawz-all the angle grinder and a drill. They stick out 1.5" past the hull near the ride plate and taper back to 1/4" at the outside. Just a little more truing and shaping and they'll go on.


  2. #2
    Yamaha artisan Cutlass's Avatar
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    Not too bad!

  3. #3
    redneck71's Avatar
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    let us know how they work i cut out some for my gp800 that should extend out about an inch hopefully get a chance to install them in the spring

  4. #4
    how do they bolt to the hull? are you going to just drill new holes? I guess I will have to go look at my gp

  5. #5
    Myself's Avatar
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    I will drill pilot holes of the proper size and use sealant to to "bond" them to the hull along with the stainless screws. You could also tear out some of the styrofoam in the rear and use backing plates from inside the hull if it makes you feel better.

  6. #6
    Can you snap a picture of the finished product so I can get my head around this?

    I read some posts about shim with washers the ride plate at rear with 10mm washers at 1mm thick.
    Did anyone do this?
    If so, how many mm did you end up with?

    Thank you

    This video is with no shims.

    Speedo is also wrong (got a little epoxy on it when I repaired the hull).


  7. #7
    Yamaha artisan Cutlass's Avatar
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    Quote Originally Posted by Severn River Runner View Post
    Can you snap a picture of the finished product so I can get my head around this?

    I read some posts about shim with washers the ride plate at rear with 10mm washers at 1mm thick.
    Did anyone do this?
    If so, how many mm did you end up with?

    Thank you

    This video is with no shims.

    Speedo is also wrong (got a little epoxy on it when I repaired the hull).

    Most people only need 1 or 2 or 3 washer/shims. Maybe 4 but never more then that. every hull is a little different so you'll need to experiment. I'd try 2 washers and see how it goes.

  8. #8
    Myself's Avatar
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    Have not any any smooth water testing yet so I'm not really sure if they helped or not. My wife ride's it with our son on back. They are holding on just fine and stick out about 1". I'll get pics.

  9. #9

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    looking into it, it seems OEM thickness of these is .345, correct? so do you have a step between hull and plates? will this be negligible, or effect performance? thinking on doing some in stainless with backing plates

    can you get some photos of your mounting? do you mean
    you epoxied them to the hull, then also used screws? they look nice btw
    kinda cart before the horse for me, but something to think about.
    Last edited by nickmm; 06-17-2013 at 09:21 AM.

  10. #10
    redneck71's Avatar
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    I have the R&D ride plate with 2 washers on the rear with pro-tech trim tabs and have almost no porpoising with the trim in the neutral position in mild chop

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