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Re: Exhaust valve seized

Posted: Thu Apr 16, 2020 3:01 pm
by Beagle
I thought the cat was part of type approval. Im suprised if BMW approve the fitting without it.

Re: Exhaust valve seized

Posted: Thu Apr 16, 2020 3:08 pm
by David.
The Akrapovic silencer is the only one approved for use by BMW.

Don't know if these headers are approved for use by BMW. The observation is that the valve has been retained.

If fitting the non-cat. version Akrapovic recommend the following.

When installing optional headers E-B12R7, remapping the ECU is recommended in order to prevent »check engine light« warning signal and achieve optimized performance and throttle response.

THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.

Re: Exhaust valve seized

Posted: Thu Apr 16, 2020 3:34 pm
by Beagle
“ THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.”


Exactly!

Re: Exhaust valve seized

Posted: Thu Apr 16, 2020 4:01 pm
by David.
I wonder if the Akrapovic header with a catalytic converter is approved for use by BMW.

Re: Exhaust valve seized

Posted: Thu Apr 16, 2020 5:03 pm
by Casbar
David. wrote: Akrapovic manufacture exhaust headers for the 1250, https://www.akrapovic.com/en/moto/products/BMW/R-1250-RT?brandId=44&modelId=994&yearId=5778

Options are available in Stainless Steel or Titanium. In both cases, they have an exhaust valve, with or without a catalytic converter.

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Interesting that the exhaust valve has been retained in all cases.
I wonder if they have had to do this to have them approved for use by BMW.
"Featuring exhaust valve for improved rideability in lower rpm."

Check out the installation instructions to see photos of the different Akrapovic v's BMW exhaust valve.
https://d1sfhav1wboke3.cloudfront.net/ImageServer/Apim2media/Documents/20687/a97ade48-8c42-4717-85de-617698a7ee92.pdf

That link is for a GS and GSA, different headers, is there one for the RT as well? Could look myself I suppose :)

Re: Exhaust valve seized

Posted: Thu Apr 16, 2020 6:04 pm
by guest4915
It's a bit late after you've traded it

Re: Exhaust valve seized

Posted: Thu Apr 16, 2020 6:09 pm
by David.
These Akrapovic installation instructions cover all R1250 models,
https://d1sfhav1wboke3.cloudfront.net/I ... 358c0b.pdf

Re: Exhaust valve seized

Posted: Thu Apr 16, 2020 7:15 pm
by Casbar
David. wrote: These Akrapovic installation instructions cover all R1250 models,
https://d1sfhav1wboke3.cloudfront.net/ImageServer/Apim2media/Documents/20688/a3e289b7-8b0f-41c1-94f4-507ea6358c0b.pdf

Great, its just they show the GS headers, which are different to the RT. But let's be honest, its not rocket science to change headers - is it

Re: Exhaust valve seized

Posted: Thu Apr 16, 2020 8:09 pm
by simbo
Casbar wrote:
Great, its just they show the GS headers, which are different to the RT. But let's be honest, its not rocket science to change headers - is it

Not for anyone with any mechanical skills it's not, it's a very straightforward job.

Re: Exhaust valve seized

Posted: Tue Apr 21, 2020 12:46 pm
by David.
Beagle wrote:Took silencer off to lube the flapper pivots.
What lube was used, was the flap seized and is it free now.
Beagle wrote:Service light now comes on but will have to wait till dealer will do it.
Can the service light be reset with the GS-911, https://www.youtube.com/watch?v=HmYQDuQyPFA

Re: Exhaust valve seized

Posted: Tue Apr 21, 2020 2:01 pm
by Beagle
Borescope Pictures of Flapper Valve and Cat

Re: Exhaust valve seized

Posted: Tue Apr 21, 2020 3:30 pm
by David.
That flap looks very clean, no sign of carbon or lubricant.

Re: Exhaust valve seized

Posted: Wed Apr 22, 2020 12:07 pm
by Beagle
I only use Shell Nitro both in the bike and the X1.

Re: Exhaust valve seized

Posted: Wed Apr 22, 2020 12:34 pm
by David.
David. wrote:What lube was used, was the flap seized and is it free now.

Re: Exhaust valve seized

Posted: Wed Apr 22, 2020 1:35 pm
by Beagle
Wasnt seized just relieving boredom. Used Graphite/Copper spray.