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  1. #1
    mrbtd's Avatar
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    D-Plate missing ?

    Ok..I am feeling like a moron right now. I Removed the upper part of my pipe and was surprised to see no D-Plate or Cat Converter..
    Am I missing something - Isnt this where it would be ?

    Do I simply add the plate here after piece 3 ? It seemed to run ok without anything in there. What does the plate do - restrict flow ?

    My ski was loud as hell with the Free Flow does this have anything to do with it ?
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  2. #2
    philip_gpr's Avatar
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    Part 3 looks like the Jetworks D plate

    I would replace it with a Riva D plate

    There should be a gasket on each side of the D plate


    yes the ski is loud with a FF - it has nothing to do with this

  3. #3
    mrbtd's Avatar
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    But there is nothing that reduces the flow. I double and triple checked there are no markings anywhere.
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  4. #4
    Moderator RX951's Avatar
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    That opening is too big to be the jetworks O-plate.
    I have the Jetworks Plate in my ski.

    There was nothing installed in your pipe.




  5. #5
    Thats probably the old CROSSBONES "O" Plate. Basically just an open plate.

  6. #6

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    Quote Originally Posted by mrbtd View Post
    Ok..I am feeling like a moron right now. I Removed the upper part of my pipe and was surprised to see no D-Plate or Cat Converter..
    Am I missing something - Isnt this where it would be ?

    Do I simply add the plate here after piece 3 ? It seemed to run ok without anything in there. What does the plate do - restrict flow ?

    My ski was loud as hell with the Free Flow does this have anything to do with it ?

    Yes, that is where the "D" plate should be, and yes it will run fine without the "D" plate, but it will run much better with it on the top end. Replace that open plate with the "D" plate as others have suggested.... you will get a much better top end at the expense of a little bottom. People would use that plate to maximize bottom torque and hole shot. We have since learned that the Jet Works valve modification will maximize bottom emd torque by not allowing water into the water box at low rpm and at the same time keep your top end by injecting water into the box at higher rpms.

    Do not buy a new plate, as there are many used ones out there for sale. As I understand it, the "D" plate effects the sonic wave created in the pipe.

    The free flow takes the place of the sound supression system in your exhaust. It is almost like removing baffels in you cars exhaust system. That is why your boat is so loud in the mid range.

    Do a search on the Jet Works mod and the sound supression systems for more details..... but get a DEEE plate.... you will be glad that you did

  7. #7
    Bringing this one back.

    Co-worker just had his XL1200 rebuilt, railed rear piston.

    Mechanic (friend of mine) did the work. Said the Converter is gone. No D Plate, nothing. Sound like it is just open. Any issues with it this way.

    Also, heat sensor wires were just cut. (Brad bought the ski 3 months ago like this. What needs to be done. What about the Riva sensor, what does this do? Does he need it.

  8. #8
    Chris03HD's Avatar
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    Just bought an XLL today, and while sorting thru the removed exhaust and intake pieces, it seems my cat con was already replaced with an o-plate.
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  9. #9
    Mike xsockguyx's Avatar
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    Quote Originally Posted by BigKahuna View Post
    Bringing this one back.

    Co-worker just had his XL1200 rebuilt, railed rear piston.

    Mechanic (friend of mine) did the work. Said the Converter is gone. No D Plate, nothing. Sound like it is just open. Any issues with it this way.

    Also, heat sensor wires were just cut. (Brad bought the ski 3 months ago like this. What needs to be done. What about the Riva sensor, what does this do? Does he need it.
    The d-plate is needed because it helps create back pressure. The riva chip stops the exhaust temp alarm from going off.

  10. #10
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by Chris03HD View Post
    Just bought an XLL today, and while sorting thru the removed exhaust and intake pieces, it seems my cat con was already replaced with an o-plate.
    Those actually work pretty good for a 1200

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