[DNA]

Greetings to all , I have owned my R9T two weeks now and having never sa on it prior to purchasing it i was amazed at how good a package it is .

Keen to make it "mine" out came the exhaust baffles and next on the sights was the exhaust flapper valve , this was duly removed and replaced with a plain piece of stainless tube, 60.5 OD x 75mm long do not purchase the commercially available part that costs £35 ( $50) just go to your local exhaust specialist and purchase an off cut. Mine was free in fact .
Having already removed the flap valve on my hP2 Sport and a GS1200 I know that it does not make any massive improvement on performance however the exhaust "crackle" on over run is to die for especially if you keep throttle off the stop a bit so some fuel is being dragged in.
Performance wise it does remove the slight dip in power/TQ between 2600-4000 rpm .

No warning lights come on the connector to the motor is simply taped up and hidden out of sight .
Next is to get rid of the KAT, this I will do by fitting Akropovic headers feon an twin can 1200GS ( yes they fit I already tried the ones of my mates GS).

It is not about performance gain it is just the noise ....

Happy riding ...

Dave.

 

[pistonbroke]

Hi Dna
Isn't it possible just to uncouple the cables which leaves the flap open.?
Cheers piston.

 

[DNA]

Hi Dna
Isn't it possible just to uncouple the cables which leaves the flap open.?
Cheers piston.

Hi,
I suppose yes it is however you are then left with the servo motor etc just hanging around , It takes literally ten minutes to remove the valve and replace it with the tube , it will take you longer to uncouple the cables ,you can alternatively just remove the connector from the unit it stays open all the time then , I did this on my HP2 as the valve was welded into the pipe an valve was open all the time , I later removed it by changing exhaust .
Removing the whole thing including motor , cleans up the bike a bit .

Sometimes less is more .

 

[delirii]

... and hidden out of sight

Where did you hide it?

 

[DNA]

Where did you hide it?

I just tucked the wire up behind the frame and secured it with cable ty , it is not visible now .

 

[BigD]

Good job!

 

[jkmalo]

please share a video please please

 

[DNA]

please share a video please please

Are pictures not enough , I am old school fart do not do video, only just started using camera!

 

[1561]

Are pictures not enough , I am old school fart do not do video, only just started using camera!

me too , so far I've managed to avoid ALL special deals on GoPro white/silver/black/ super black / matte black 2.0.1 / ....

 

[Cruisincruzan]

When you say remove the whole thing including the motor, by motor I assume you mean what the microfiche calls the servo unit? The wire you zip tied to the frame was the electric cable that goes into the servo unit? I would also like to remove that bit of clutter.

 

[DNA]

When you say remove the whole thing including the motor, by motor I assume you mean what the microfiche calls the servo unit? The wire you zip tied to the frame was the electric cable that goes into the servo unit? I would also like to remove that bit of clutter.

Yes I removed the servo motor and valve , if you really need to remove the wire trace it back and cut it off , just insulate the bare ends , I personally just tucked it up out of the way, it really does not weigh that much ...

 

[landski]

Next is to get rid of the KAT, this I will do by fitting Akropovic headers feon an twin can 1200GS ( yes they fit I already tried the ones of my mates GS).

Now this I´d like to see pics of!

 

[Bonkorama]

Let mere be the first retard to ask this but...
Why is all this necessary?

I don't get it.

 

[Mr. Bones]

Let me refer to DNA's first posting:

It is not about performance gain it is just the noise ....

 

[Bose]

Let mere be the first retard to ask this but...
Why is all this necessary?

I don't get it.

It's a personal choice thing (removal)
It will make no difference to anything really apart from you may loose a very small amount of engine braking 1.3% as the valve won't be shutting to slow down exhaust gasses escaping ,but it doesn't close fully on throttle release
If as and when the valve seizes through carbon build up just remove it then .
As stated its a noise retarder exhaust valve that's all and it's not a vital part

 

[Bonkorama]

I forgot about that first post.
Since I can hardly effing hear anyway from years of blasting music, less noise is my motto... not more ( except when it sounds sooooo good)...

 

[VintageBMWbiker]

Exhaust valve removal

I thought I'd create a new thread for this since it didn't really fit under removing the baffles.

Is anyone who wants a throatier exhaust note considering removing the Butterfly valve? Unlike EXUP, the BMW version is apparently only there to quiet the bike at lower (read testing) speeds. Here's an online tutorial I ran across on how to do it: Removal of the exhaust control vavle

I love the stock sound but I want more! It's just too civil a note for the badass looks of the bike IMO...especially around here in the land of Harleys. So...a full de-cat'ing, de-exhaust valve'ing Remus system is on its way to me. A booster plug is included to help with the expected lean mixture issues. I'll post a before and after video if there's interest.

If anyone is considering an aftermarket Akrapovic can, their sales page might be of interest. I was surprised how similar the notes were and that the measured dB levels were identical.

 

[path]

cool, thanks.

existing thread here:

http://www.ninetowners.com/forum/engine-technical-discussion/51010-exhaust-flap-valve-removal.html

 

[Lost Rider]

Merged with existing flapper thread.

 

[VintageBMWbiker]

Merged with existing flapper thread.

Thanks, Lost.
I'll make a point of searching the archives thoroughly next time!