Who's online: JamesJ, dev1, skirtster, Guests: 109
  • FATTY1 Posts: 8
    Stock Poster FATTY1
    09 Jan 2020 08:17 PM
    Hi All,

    Does anyone know what the round fitting does on the original exhaust. Its a cable fitting with a wire that runs to the engine, it seems to spin at some point. How does it come off? and why doesnt my replacement have this fitting to re attach?

    thankyou

    alex


    HD Forums Australia - 20200109_192801.jpg

    HD Forums Australia - 20200109_182855.jpg

  • Ken in Cairns Posts: 635
    Cairns FNQ
    Performance Poster Ken in Cairns
    09 Jan 2020 08:28 PM
    Is it an O2 sensor ?
  • tussuck Posts: 2591
    Melbourne
    Forum Legend tussuck
    09 Jan 2020 08:31 PM
    About 8" from the exhaust port at the heads?  O2 Sensor.
  • paulybronco Posts: 13493
    Forum Legend paulybronco
    09 Jan 2020 08:32 PM
    Quoting FATTY1 on 09 Jan 2020 08:17 PMedited: 09 Jan 2020 08:42 PM
    Hi All,

    Does anyone know what the round fitting does on the original exhaust. Its a cable fitting with a wire that runs to the engine, it seems to spin at some point. How does it come off? and why doesnt my replacement have this fitting to re attach?

    thankyou

    alex


    HD Forums Australia - 20200109_192801.jpg

    HD Forums Australia - 20200109_182855.jpg

    Maybe a pic......
  • Ken in Cairns Posts: 635
    Cairns FNQ
    Performance Poster Ken in Cairns
    09 Jan 2020 08:38 PM
    Come on Paul what is the fun on that ;)
  • FATTY1 Posts: 8
    Stock Poster FATTY1
    09 Jan 2020 08:43 PM
    hi all,

    thanks for the replies, pics uploaded...

    anyone?

    alex
  • joey Posts: 165
    End of the Woods
    Stock Poster joey
    09 Jan 2020 08:56 PM
    It’s ya flapper valve
  • FATTY1 Posts: 8
    Stock Poster FATTY1
    09 Jan 2020 08:58 PM
    ????

    ok, so what does it do? can i remove it safely and how?

    thankyou all.

    alex
  • Grease Monkey Posts: 1029
    Performance Poster Grease Monkey
    09 Jan 2020 09:05 PM
    If you have a flash tuner turn it off in the cal and unplug it, you can then take all the actuator stuff off, if you can't turn it off get a dealer to do it for you. It's just a valve to limit gas flow.
  • paulybronco Posts: 13493
    Forum Legend paulybronco
    09 Jan 2020 10:50 PM
    Grease Monkey is on the money. It acts like a butterfly valve and is a twofold purpose. Supposed to increase TQ at lower rpm by remaining closed then opening up for better flow at higher rpm. The second was to limit exhaust noise for epa at lower /idle speeds. As Grease Monkey said you can deactivate it with your tuner
  • Retroman Posts: 1105
    The far west
    Performance Poster Retroman
    25 Jan 2020 07:40 PM

    Fugg me this question 13 years on !

    This is the "Active Exhaust" in Harley speak , it is NOT on US "Domestic" bikes only on some market 5HD vin numbers including EUROPE

    We in Australia get the Euro spec bikes 100% ( bar the LHD headlights !). Have done since October 2006

    I said the 'zact same thing to Frasers HD in Perth in October 2006. "What the fuggzthat ?" Re my new 2007 FXSTC just arrived in Oz

    AND THEY DID NOT KNOW I KID YOU NOT !

    So I found out and told 'em you betcha. I Worked out you could "fool" it and not trigger a fault code by just screwing or riveting the flapper in the open position.

    So I tells Frasers and they started doing it at PDI on many bikes. I did many bikes for mates , and 13 years on they are still running allright, flapper screwed open.

    I have now worked on many "Grey imports" both from the USA and Japan and they do not have this "Active exhaust' system. ( we also get "active air" they don't !)

    It is not to increase torque , it is purely for Euro spec "drive-by" noise testing while you are in metro areas like Paris for example.

    They strangle the bikes to buggery and always did.

    If you change out the stock headers , as in fitting a V&H system for example you just unbolt and unplug all that bullshit along with the stock exhaust.

    If you have a "race tuner" for the bike then there are calibrations or "'MAPS" that allow you to switch off or more accurately "disable" active exhaust and air.

    You may then have to over flash the bike again with a calibration for your model/cams etc etc. Not all calibrations allow toggling OFF and ON

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