Valve in muffler

[Garry Richards_imp]

Hi - what is the cable activated valve in the muffler that open and shuts the piece of metal in the end of the muffler

[Randy B]

I don't understand the question. That is not something that came to the states, but is on the AU and Japan market bikes for sure.

[Garry Richards_imp]

Thanks Randy - I guess it is some sort of emission control. If I put on an after market exhaust I might just have to disconnect it.It's a weird contraption - a flap opens and shuts at the tailpipe but I'm not too sure how it all works. I only picked up the bike today.

[flynrider]

Welcome Garry! That valve is not present on U.S. models, but I recall a pretty detailed discussion on the forum.

I found it :

http://cb1100forum.com/forum/showthread.php?tid=2754

Looks like at least one aftermarket exhaust manufacturer (Staintune) recommends removing the linkage if you install their can.

[Garry Richards_imp]

Thanks for all your help. I intend to fit a Staintune so I'll speak to them about it . It's not really like an "exup" as they are fitted before the muffler. This thing is just a piece of thin metal that sits right at the end of the pipe.

[CIP57_imp]

Gary,

The flap/Valve comes on the CBR1000RR here in the US on 2008 up, i had to positioning the valve to fool the ECU into thinking it was still hook up. I'm sure any aftermarket exhaust will come with a full explanation of the process.

The valve stays shut and opens once it reaches a certain RPM.

[Lord Popgun]

Here is an explanation. And a pitch for a product naturally.

http://www.skutr.net/exhaust-valves-and-...explained/

[Xyzzy_imp]

Gary,

The flap/Valve comes on the CBR1000RR here in the US on 2008 up, i had to positioning the valve to fool the ECU into thinking it was still hook up. I'm sure any aftermarket exhaust will come with a full explanation of the process.

The valve stays shut and opens once it reaches a certain RPM.

On my CBR1000RR I just disconnected the cable. The servo still moved so the ECU was happy.

Some people want to save some weight so they use a "[url=http://www.revzilla.com/motorcycle/servo-buddy-honda-cbr1000rr-vfr1200]servo buddy".

My VFR1200F had the same cable setup as well.

[Cormanus]

Garry, Pterodactyl in Sydney has fitted a Staintune. He's been traveling but, when he gets back, I'm sure he can help with this question.

[Tyke57nz_imp]

G`day
Exhaust system and Air Induction both have "flap valves" installed and are operated by a vacuum line from the Airbox to a Solenoid Valve located behind the RH side cover. The Solenoid Valve is easily identifiable as it gets in the way when you want to remove the Air Filter cover to inspect the Air Filter. I run my machine with a Staintune, the cable is disconnected from the servo which still operates on the signal from the ECU but does nothing. I have plans to fit a US/UK Air intake to my machine and remove the associated pipework and solenoid replacing the Solenoid with the requisite resistor buth have yet to get round to it.
The explanation from Red Mist in http://cb1100forum.com/forum/showthread.php?tid=2754 covers the subject quite well I thought.
Cheers