HEADER VALVE QUESTION

[CPJS]

My bikes were '14 E3 and now '17 E4. I also fitted a full system for a friend on a '16 E3 no error codes on any of them. I don't know if E5 is different.
My OE headers are in the loft with the cable attached all wrapped up by the dealer who swapped the full Akra system over from the old bike before the new bike turned a wheel.
I had made up a little sealing plate to cover the cable holes, so, rather than mess around with it all the dealer just swapped the actuator over as well.

 

[r1happy]

I had a full decat system on my 2015 GSA with no fault codes. My dealer fitted a Remus decat system to my new 2019 1250 GS, before it left the shop, and got the fault code. Dealer could not get rid of it, and said the bike exhaust valve cables had to travel enough to turn the valve through 90 degrees to not get the fault code. It was only sorted with a servo buddy.

 

[casbar]

I am pleased that you have an idol to worship, but the OP asked about 1200/1250 bikes and your idol has admitted that he is talking about an older bike that was Euro3!
How many people will now disconnect the valve and find that it does throw a code, so saying that it won't is fake news.

The 1200s were Euro 3 until the 1250s came along, the flap behaved the same on bikes from 2014 right up to 2019 and the 1250s. Then all that changes was a visible engine warning light when the flap was stuck as opposed to an error on the ecu which you wouldn’t know about. Later software updates also stopped the flap cycling on start up. My only question is if disconnecting the cables stops the error codes, why is there a need for a servo buddy device to fool the ecu. The testing I did, showed the servo pulled the flap closed, but the spring on the flap reset the servo. Therefore no cables didn’t allow the servo to reset, so an error code was posted. But that might have just been an error on the bike I was messing with. I still have access to that bike so can have another play in the future

 

[knutk]

I'm on the road now, but I return for home over the weekend.
In order to clearify l'll pull the cover off on my 1250 and get a verification.
Then again, my 1250 is a -19, so we may never be sure that BMW have done minor internal changer to their later bikes.
But frankly, this is not very complicated.
After removing/disconnecting the exhaust flap, it's as simple as reconnecting the servo to the bike.
If the bike then trigger a warning, get a Servobuddy. If no warning or faultcode is triggered, then money are save....

 

[casbar]

I'm on the road now, but I return for home over the weekend.
In order to clearify l'll pull the cover off on my 1250 and get a verification.
Then again, my 1250 is a -19, so we may never be sure that BMW have done minor internal changer to their later bikes.
But frankly, this is not very complicated.
After removing/disconnecting the exhaust flap, it's as simple as reconnecting the servo to the bike.
If the bike then trigger a warning, get a Servobuddy. If no warning or faultcode is triggered, then money are save....

It will be good to see the results. Would save on buying the servo buddy jobber, although they are not that expensive. I am interested to see if the servo actually works both ways, as I said, the last time I played with it (4 years or so ago), the servo only moved one way and didn't reset without the help of the spring on the flap pushing it to reset. Of course the servo could have been duff

 

[Pukmeister]

I'm on the road now, but I return for home over the weekend.
In order to clearify l'll pull the cover off on my 1250 and get a verification.
Then again, my 1250 is a -19, so we may never be sure that BMW have done minor internal changer to their later bikes.
But frankly, this is not very complicated.
After removing/disconnecting the exhaust flap, it's as simple as reconnecting the servo to the bike.
If the bike then trigger a warning, get a Servobuddy. If no warning or faultcode is triggered, then money are save....

My '19 1250 GSA is back with the dealers to investigate an oil leak so I can't check mine.

Can you check your bike to see if the flap cycles on pre-start ?

 

[knutk]

My '19 1250 GSA is back with the dealers to investigate an oil leak so I can't check mine.

Can you check your bike to see if the flap cycles on pre-start ?

I'll check it as soon as I get back home.
This will be beginning of next week.

 

[casbar]

My flap no longer cycles on pre start, it was a software update (1250). It used too, but after the update, it only moves now once the engine has started

 

[Alan R]

I am pleased that you have an idol to worship, but the OP asked about 1200/1250 bikes and your idol has admitted that he is talking about an older bike that was Euro3!
How many people will now disconnect the valve and find that it does throw a code, so saying that it won't is fake news.

Not an idol, don’t be silly. It never hurts to be polite and helpful and less acerbic. I have no answer to your question about how many will now disconnect the valve. Maybe people will read, consider and arrive at their own conclusion without either idolatry or Trumpian dismissal.
Alan R

 

[Micko123]

Not an idol, don’t be silly. It never hurts to be polite and helpful and less acerbic. I have no answer to your question about how many will now disconnect the valve. Maybe people will read, consider and arrive at their own conclusion without either idolatry or Trumpian dismissal.
Alan R

I have read, considered, and arrived at my own conclusion...
and agree totally with Alan R's comments . Unfortunately there is a certain section on this wonderful forum where acerbity is the natural default reply to a post, such bigotry deserves Alan's polite response.
Now both knutk and Alan R have become my idols ! .

Sent from my SM-G981B using Tapatalk

 

[knutk]

My '19 1250 GSA is back with the dealers to investigate an oil leak so I can't check mine.

Can you check your bike to see if the flap cycles on pre-start ?

My -19 1250 GSA do cycle the exhaust valve during startup. By observing the valve, when running the engine at idle, the valve appears to stay open or partly open after it has started.

If I then stop the engine by turning the ignition off, the valve remains in it's latest position. The recycling of the valve during power-up ensures that the exhaustvalve stay in it's correct position prior to restarting the engine.

Then I diconnected the cables from the valve allowing the cables to run freely in the open air.

This triggered a faultcode claiming the wrong position of the valve. No warning is showing on the instrument panel, which I interpret as BMW having installed a potmeter monitoring the motors movement where the motor is stopped in it's movement both directions by the valve hitting it's mechanical stops.
Besides the codes issued internaly, it did not sound like disconnecting the valve affected the running of the engine. No trace of any kind of limpmode.

But that said, my -19 1250 is still a Euro 4 bike where it seems to ignore the output from the rear O2 sensor. Decating the Euro 5 bikes where the rear O2 sensor is activly monitored will probably need some dongle that emulates a proper reading from the rear O2 sensor. I have no experience with this setup, but the natural thing when making an emulator to fix the O2 issue would be to also include a dummy replacing the flapper valve servo.

Anyway, this is the what I learned, and I take it that most inmates are sensible enough to use this information to make their own descission, based on the year of the bike and type of header they install.

 

[casbar]

My 2019 1250 no longer cycles the valve at stat up (ignition on). This changed after a software update. The valve only moves now when the engine is running