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2019 R1250rt
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Discussion Starter · #1 ·
Well finally someone listened. The horn on this bike is an air horn. Not as loud as the Denali SoundBomb but loud enough..

BUT!!!!!

On my first ride I tested the horn with my earplugs in and I could hear it so all good. The ride was nearly 400kms...mostly in rain.

Then on my next day I tooted and the horn didn't sound right. I tested it again and could feel a vibration but couldn't hear the horn.

On my final day I needed the horn and same again.

Once home I tested it and yes it was certainly not working as it should. More a gurgle than a loud BEEP.

Wondering if maybe some debris had got into it I decided to take it off and check it.

No debris...But certainly some water came out....and more...and more.

Seems on my first days ride the rain had caused the horn to fill up. The actual horn part as pointing forward so I guess the rain was invited in.

I've emptied it and it works. And I've reinstalled it facing downwards. Hopefully that stops future issues.

Suggest a check if you have one. Just loosen the screw and turn downwards.
 

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I just looked at mine. The front horn faces forward but slightly down, no chance to hold water, the rear has more of a chance to act as a water jug. Which one was holding water for you?
 

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Discussion Starter · #3 ·
I just looked at mine. The front horn faces forward but slightly down, no chance to hold water, the rear has more of a chance to act as a water jug. Which one was holding water for you?
That was the same as mine. It appears the excessive rain (at speed) must have been forced into the horn tube. I think internally it goes around and the water became stuck in some holding area.
Even holding it vertical didn't empty it. I had to sort of "unwind it" to get the water out.
I didn't notice a rear? Just the one horn.
 

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Discussion Starter · #5 ·
I just looked at mine. The front horn faces forward but slightly down, no chance to hold water, the rear has more of a chance to act as a water jug. Which one was holding water for you?
OK checked again and yes there is the rear one a bit higher.
Also not easy to turn down as it will impede with the forks at full lock. Bad design.
 

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When Twisted Throttle used to sell the Stebel Nautilus air horn, they had this note on the product page:

Per the manufacturer, this horn should be mounted so that the cylinder is vertical (with the horn facing down). There should be no more than a 15 degree variance from the vertical position. If it is not mounted per these specifications, then the horn may cease to function after a period of time.

Stebel itself used to have documentation about this sort of thing with their products, but the web site seems to have only non-hyperlink placeholders these days. See, for instance:


While TT no longer appears to sell Stebel products, I know that quote because I've done a few cut-and-pastes over the years, on assorted forums when discussing this issue, because I added air horns with separate trumpets and a compressor on a 2000 Valkyrie, and then nothing but the one-piece Nautilus on all (three) bikes since.

If the trumpets are covered by a fairing, for instance, it's not an issue, and they are usually still plenty loud, as most fairings have a lot of open area at the bottom. If they are not covered, then, yep, you should be careful to mount them so water can drain.

On my Valk, with the two-piece system I used, the trumpets were underneath the bike, and pointing only slightly downward (due to space limitations). For those, I also used to spray WD-40 inside the trumpets every few months, to keep the vibrating parts in tip-top shape; this was a procedure recommended back then by some other folks, and seemed to be a good PM practice, for what otherwise wasn't a very good mounting angle. Since then, I've adhered to the point-it-down-and-also-covered system, no PM required.
 

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Discussion Starter · #9 ·
Maybe BMW should learn from specialists before changing. I think the new horn is great but seriously...horns 101!!
Dealer has ordered new horns.
About to head off on another trip - 2000kms and it looks like same again - RAIN!!!
Oh well...lets test it again.
 
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