Exhaust flapper valve issue

Captain Greg · Mar 21, 2017

I know this topic has been discussed on here, I mentioned to my dealer it's been said that disconnecting the cable from the servo may reduce heat build up?
He says no it will make no difference? And it may throw a code?
Guys what's the consensus to removing the cable from the valve ? I see the spring rotates it to a position? Is that open or closed?
Is there any tangible advantage?
I'm not concerned with regulations or emissions laws

RetardedTiming · Mar 21, 2017

Before I bought the Akra header my dealer disconnected the servo when they installed the slip ons. Spring holds it open. No code.

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Captain Greg · Mar 21, 2017

Thanks
Any advantage in a standard bike?

redfire · Mar 21, 2017

If you disconnect when the bike is off will it keep open?

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RetardedTiming · Mar 21, 2017

The spring does not snap it closed, it snaps it open. The servo closes the valve.

rrgermanlv · Mar 21, 2017

Captain Greg said:
I know this topic has been discussed on here, I mentioned to my dealer it's been said that disconnecting the cable from the servo may reduce heat build up?
He says no it will make no difference? And it may throw a code?
Guys what's the consensus to removing the cable from the valve ? I see the spring rotates it to a position? Is that open or closed?
Is there any tangible advantage?
I'm not concerned with regulations or emissions laws

I completely removed the flap from my exhaust and the heat is the same.

Also, you shouldn't get a code on the display/dash (at least on the 1199) but for sure you get an internal code that you are only able to see if you have a scanner. Even if you put a servo buddy or the duc.tee or whatever name it is, you will get the internal error.

The only way I was successfully able to get rid of that error was after the Rexxer flash.... (exhaust valve disabled)

bradp51 · Mar 21, 2017

Captain Greg said:
I know this topic has been discussed on here, I mentioned to my dealer it's been said that disconnecting the cable from the servo may reduce heat build up?
He says no it will make no difference? And it may throw a code?
Guys what's the consensus to removing the cable from the valve ? I see the spring rotates it to a position? Is that open or closed?
Is there any tangible advantage?
I'm not concerned with regulations or emissions laws

Is there any tangible advantage ? In short Yes.

The valve is there to confirm to noise regulations. It operates at certain revs and speed to pass a ride by test.

When we all got the 1199 way back when (2012) and we first got our bikes you could suddenly hear the exhaust note dropped. Lots of people including me in the first few weeks of ownership thought some was going wrong. I thought a cylinder was losing spark.

So we all just disconnected cable. Its been funny because for the next few years one of the most common questions was "does it throw a code on the dash" Not on the 1199. But the dealer can see it when he puts his diagnostic tool on it.

Can you tell any performance increase ? Nah. But it does stop that annoying on off sound "quiet mode" what ever you want to call it.

On the 1199 you can ever save some weight by removing the servo motor.

The servo moto and wiring weighs 420 grams. Cheap weight saving.

Now you know the history and everything you need to know about the flapper valve. 1199 specific.

MB Duc · Mar 21, 2017

No code on the 1299 for me.

redfire · Mar 21, 2017

If disconnecting the cable open the valve why people should remove the butterfly? I remember to watch a video with that procedure

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rrgermanlv · Mar 22, 2017

redfire said:
If disconnecting the cable open the valve why people should remove the butterfly? I remember to watch a video with that procedure

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Because people are OCD (or at least me) and want to get rid of it to have 100% free flow inside the pipe and I guess to get rid of that weight (that butterfly and rod are heavy-ish).... You don't have to if you don't want to.

Sirpudgealot · Mar 22, 2017

Although I technically did it so my termi's would quit hitting my rear tire. you could cut it out. (not the greatest but it was the first time ever tig welding)

bradp51 · Mar 22, 2017

Sirpudgealot said:
Although I technically did it so my termi's would quit hitting my rear tire. you could cut it out. (not the greatest but it was the first time ever tig welding)

Well done for having a go. Always impressed to see people do something for themselves rather than go to a dealer. And no one is going to see much of that weld.

karrl · Mar 23, 2017

No code on the 1299 for me.

I read that some 1299 get an update for the spring that should hold the flapper valve open.

Stronger spring and a adapted software for those 1299 having problem reaching top speed as it should be.

Ask your dealer, he could check that with the 1299 serial no.

karl

TurboLag · Mar 23, 2017

Shouldn't be a problem. There has been a few cases where the spring wasn't strong enough to keep the flapper open on the 1299, but you could solve that by safety wiring it open

mquaedflieg · Mar 23, 2017

TurboLag said:
Shouldn't be a problem. There has been a few cases where the spring wasn't strong enough to keep the flapper open on the 1299, but you could solve that by safety wiring it open

That is why I physically removed the flapper and the rod with a dremel.

rja4z3 · Mar 23, 2017

You can also just disconnect the flapper valve wiring harness (highlighted yellow) and seal both ends with electrical tape. Once disconnected, the flapper valve will no longer function (stays open) and on start you won't here the flapper initiate. I'm too lazy to remove the servo motor etc, and disconnecting the cable just bothered me for some reason. haha

redfire · Mar 23, 2017

Great pic! Where is the cable? Left or right side?

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rja4z3 · Mar 23, 2017

Ah, sorry! It's on the clutch side (left). You just need to remove the middle and lower fairing.

Ryfly05 · Mar 23, 2017

It's like an extra 5 - 10 mins to remove the servo motor if you're already in there. Very easy plus weight savings.

rja4z3 · Mar 23, 2017

Ryfly05 said:
It's like an extra 5 - 10 mins to remove the servo motor if you're already in there. Very easy plus weight savings.

Could you share a tutorial?

Exhaust flapper valve issue

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