Author 2019 Dynamic Pro XR - should I disconnect the ‘flapper’ wires?  (Read 671 times)

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  • Offline Beemah   us

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    Offline Beemah

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    2019 Dynamic Pro XR - should I disconnect the ‘flapper’ wires?
    on: August 09, 2022, 05:29:44 am
    August 09, 2022, 05:29:44 am
    What are flapper wires? What are the pros/cons of disconnecting them on my 1st Gen dynamic pro? How do I do it?

    Some guy on Reddit just posted a picture of his new, 2nd Gen XR and said he just took the flapper wires out for a little more noise out of the exhaust. I have never heard of this, so I looked it up and am intrigued. What exactly is it? How does it work?

  • Offline Antares   gb

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    Re: 2019 Dynamic Pro XR - should I disconnect the ‘flapper’ wires?
    Reply #1 on: August 09, 2022, 07:03:34 am
    August 09, 2022, 07:03:34 am
    "Flapper wires" refer to the bowden cable  that actuates the exhaust valve via a servo motor. Disconnecting them will simply mean the exhaust flap is always open by spring tension and therefore more noise. On the gen 1 there is some difference but it's not massive.

    Pros:
    More noise
    Maaayybee better power/response down low

    Cons:
    More noise
    Slight possibility of exhaust valve slamming shut at high RPMs due to exhaust flow, I recommend security wiring the exhaust valve so it's locked open.

    It doesn't damage or affect the bike in anyway apart from this. It will throw a hidden code on the Gen 1s but no warning triangle so I wouldn't worry.

  • Offline Beemah   us

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    Offline Beemah

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    Re: 2019 Dynamic Pro XR - should I disconnect the ‘flapper’ wires?
    Reply #2 on: August 09, 2022, 04:15:42 pm
    August 09, 2022, 04:15:42 pm
    All I could find on the topic was this video, removing the servo from a 2016 RR. Seems simple enough, does the muffler have to be removed for this? How do you make sure the flapper is in the 'off' position?


  • Online smithy   au

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    Re: 2019 Dynamic Pro XR - should I disconnect the ‘flapper’ wires?
    Reply #3 on: August 09, 2022, 10:54:06 pm
    August 09, 2022, 10:54:06 pm
    Just disconnect the cables, pretty simple. The valve "defaults" to.... and is spring loaded to open. As Antares says, it will throw a fault code but not a fault light.

    Smithy.
    Last Edit: August 09, 2022, 10:55:35 pm by smithy
    When I die, I want to go peacefully in my sleep like my Grandfather....not screaming like the passengers in his car..!

  • Offline Beemah   us

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    Offline Beemah

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    Re: 2019 Dynamic Pro XR - should I disconnect the ‘flapper’ wires?
    Reply #4 on: August 09, 2022, 11:35:59 pm
    August 09, 2022, 11:35:59 pm
    *Originally Posted by smithy [+]
    Just disconnect the cables, pretty simple. The valve "defaults" to.... and is spring loaded to open. As Antares says, it will throw a fault code but not a fault light.

    Smithy.

    The best info online I have been able to find regarding this mod is your post. Just disconnect the cables - I will zip tie them to secure them.

  • Online smithy   au

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    Re: 2019 Dynamic Pro XR - should I disconnect the ‘flapper’ wires?
    Reply #5 on: August 09, 2022, 11:57:04 pm
    August 09, 2022, 11:57:04 pm
    *Originally Posted by Beemah [+]
    The best info online I have been able to find regarding this mod is your post. Just disconnect the cables - I will zip tie them to secure them.

    Ideally you should remove the cables and servo itself and fit a servo buddy....but tying the cables up out of the way will work, you'll just get a fault code as the ECU will think the servo is not working properly. The "stop & start" points of the servo will now be different to when it was fitted at the factory, hence the fault code.

    Smithy.
    When I die, I want to go peacefully in my sleep like my Grandfather....not screaming like the passengers in his car..!