Dodging exhaust flap bullets!!

General discussion of the BMW R1200RT/R1250RT
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Re: Dodging exhaust flap bullets!!

Post by Excellence »

It'd be interesting to keep an eye on that.
Thanks for your advice on the flap, etc.
Yes I watched that video among the many others!!
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Doctor T
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Re: Dodging exhaust flap bullets!!

Post by Doctor T »

There is a realy easy anwser to the flap problem. Get a older bike 8-)
Trust me I am a retired Doctor and lecturer at Oxford University of Structural and Mechanical/Electrical engineering.
"Blessed are the cracked, for they shall let in the light". Groucho Marx
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David.
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Re: Dodging exhaust flap bullets!!

Post by David. »

Doctor T wrote: Sat Mar 04, 2023 11:07 amThere is a really easy answer to the flap problem. Get a older bike.
Agreed, the vintage ones are the best. My flap is still operational after 11 years and 43,000 miles. If it fails, it can be removed and a bobbin piece fitted.
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Re: Dodging exhaust flap bullets!!

Post by hammo »

Has no one ever asked BMW why they cannot sort this out ? After it did not bother Yamaha .
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Stu
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Re: Dodging exhaust flap bullets!!

Post by Stu »

hammo wrote: Sat Mar 04, 2023 11:40 am After it did not bother Yamaha .
Oh it did!

They had the same issue of it seizing up as did other manufacturers who fitted them

Some got it better than others though
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Re: Dodging exhaust flap bullets!!

Post by David. »

The difference between the vintage bikes and the modern ones is that the flap spindle was in the horizontal position, nows it's vertical. I wonder whether this is a contributory factor the the more recent failures.
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Re: Dodging exhaust flap bullets!!

Post by Doctor T »

Being vertical, i wonder if water is dripping in on the top ceasing the spindle. Whereas the older type, the water would run past the spindle
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Re: Dodging exhaust flap bullets!!

Post by David. »

On the modern bikes, the bottom spindle bearing will also be contaminated internally with condensation from exhaust gases.
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Re: Dodging exhaust flap bullets!!

Post by Stu »

Its the same issue on the RnineT and thats mounted differently
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I think its just a bad design
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Re: Dodging exhaust flap bullets!!

Post by David. »

The R nineT is the same as a Camhead.
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Re: Dodging exhaust flap bullets!!

Post by simbo »

David. wrote: Sat Mar 04, 2023 11:20 am Agreed, the vintage ones are the best. My flap is still operational after 11 years and 43,000 miles. If it fails, it can be removed and a bobbin piece fitted.
My vintage bike (2011) had had the flap removed when I bought the bike 7 years ago with 15k miles, I can only presume it had been removed due to failure.
The GS 'is' the better bike :-)
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Re: Dodging exhaust flap bullets!!

Post by David. »

hammo wrote: Sat Mar 04, 2023 11:40 amHas no one ever asked BMW why they cannot sort this out. After it did not bother Yamaha.
sakm wrote: Sat Mar 04, 2023 11:45 amThey had the same issue of it seizing up as did other manufacturers who fitted them.
If Highland Rider is correct, Yamaha ditched the Exup valve and both Ducati & KTM have experienced the same problems as BMW.

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Re: Dodging exhaust flap bullets!!

Post by exportman »

On my 2016 bike I had the valve replace within 12 months under warranty the valve went again about 18 months later I just ignored it. The valve both times stuck fully open so the only issue was a little extra noise at low speed, I saw no discernible difference in performance. On the 2016 model it did not add any warning lights

I wonder why BMW and the other manufacturers have not made this a separate section of the exhaust, a replaceable part that must cost considerably less than replacing the whole header for them to replace.

I now have the 2023 with TFT so I I guess I will get the engine management light if it stick, Once its out of warranty and BMW won't replace it FOC I will just buy an eliminator. It should not impact the insurance as it not going to increase the performance of the machine.
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Re: Dodging exhaust flap bullets!!

Post by David. »

exportman wrote: Sun Mar 05, 2023 10:59 amI wonder why BMW and the other manufacturers have not made this a separate section of the exhaust, a replaceable part that must cost considerably less than replacing the whole header.
On a Camhead, the flap is a separate section which can be replaced but that's old fashioned.
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Re: Dodging exhaust flap bullets!!

Post by Stu »

@exportman Thats right, On the 1200 it brings up no warning light but stores an error code in the ECU

The 1250 brings up a warning light and as such maywell fail an MOT

I agree it would have been so much easier for them to make it an addon rather than build it in! I wonder if a change in legislation dictates that it has to be built in and not removable.
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