I had a Stebel Nautilus installed on my Honda Nighthawk when I wrecked it this summer. Instead of letting the insurance benefit from my hard work, I took it off the bike before I let them run off with it to the boneyard. Since I got my 919, I've wanted to get it on there. That pathetic excuse for a horn that came with it was just plain dangerous.
So, this past weekend, I went about getting it installed.
Typically what you see with a Stebel install is the compressor and horn unit all mounted together in one tidy package. Tidy as in all together, but that doesn't mean it necessarily LOOKS tidy. In fact, they look rather obnoxious to me. So it was my intent on my 919 to go against the grain and make it less visible. What I did was take the horn off of the compressor. Once I did this, I cut off most of the "ears" of the horn that wrap around the compressor. I left enough (by accident, actually) to drill holes in and run zipties through. I then bought about 5 feet of 5/16" ID fuel line from Lowes. I bought fuel line because 1) it was black and would blend, 2) because I knew it was going to be in close proximity to the engine, and therefore would end up a little warm. Below is what I started with:
I took the horn itself and mounted it to the tube that goes in front of the engine and behind the exhaust that you are supposed to mount your frame sliders to (my next project, hopefully). The hose attaches to the horn via a brass 5/16" plumbing barb that was press fitted into the original port that the compressor blows air into. I wasn't to sure how well the horn would hold up to the heat, but so far I haven't had any problems after about 60 miles and a few 100+ mph streaks. If you look really close, you can see where the horn is behind the exhaust here:
As you can tell, the horn is MUCH less obtrusive than the standard install on a naked bike. Or at least it is to me. Since this picture was taken, I have removed the stock horn. Originally I wanted to have both horns function at the same time, but I decided not to mess with the wiring of it. If you look closely at that picture, you should be able to see the fuel line running from the horn. I routed that up over the engine, under the tank and into a space on the left side of the bike under the seat. This picture might clear it up for you where it goes:
As you can see, the fuel line runs into this area and connects to the compressor that was originally attached to the horn. I have zip tied the exhaust port extension back onto the compressor just because I had read where someone else did this and it seemed like a good idea.
I installed the compressor in this empty space using a rubber band like thing that I'm not sure what it's original OEM use was supposed to be. I'm assuming that it's actually there for a reason, but for me, it was there to hold down my compressor.
(NOTE: The manufacturer recommends that the compressor be mounted in a vertical position no more than 15 degrees off of vertical. Obviously I have not followed this recommendation. I don't know how this will affect the compressor and any damage that is caused is my own problem. If you choose to follow my lead, and damage that is caused by you mounting your compressor this way is YOUR problem.
I mounted the relay with super strong double sided tape to an area just above the battery box. You can ALMOST make it out in this picture (sorry, decided to take this picture after everything was back together again).
In all, I think it turned out to be a fairly clean install. Unless you are looking for it, you'd never know I have this horn installed on my bike. I like to keep things hidden like that. Even more, I like to roll up on pedestrians walking down the sidewalk and blast the daylights out of them. I'm a mean guy.
Hope this helps someone else wanting to install this horn.