Topic: Ear Cannon Horn install

[Porscheguy912]

So I got the Ear Cannon 139 dB horn for my bike. Here is the Link: http://www.aerostich.com/ear-cannon-air-horn.html
Its sure to be loud enough to wake up the sleepiest of soccer moms.

Installing on my 78' CB750F

The problem is that its freaking huge and also too unsightly to mount on the forks where the old horns are.

So, Since removing all that breather mess from under my battery box there is a big empty space left.
 I decided this would be the best place.

So I welded a Tab to the bottom of the battery box to attach the horn.
I needed a spacer to go in between the horn and the battery box because of the shape of the top of the horn is not flat. I found a piece of carb linkage on a set of junk carbs that worked perfectly.

Then on the other end:
Because this horn uses a Relay, I decided the best place for it was at the electrical panel.
I ran the horn switch lead (which is actually a ground) and a hot lead from the head light bucket to the electrical panel via a length of vacuum hose I had laying around the shop. I did this because when I first got the bike I re-wrapped the entire wiring harness and I never want to do that again unless I'm relocating the electrical  panel. So to avoid having to cut into my nice new harness and to avoid seeing two bare wires running out the back of the headlight bucket and winding under the gas tank I decided that the vacuum line was a nifty alternative. I sprayed some silicon grease in the tube to facilitate getting the wires through easier.

After that it was just a matter of a 20 amp in-line fuse from the battery and some female disconnects with some heat-shrink tubing to keep everything dry.

Just don't make the mistake I did and not connect the wires to the actual horn before bolting down the battery box in place. I thought there would be enough room to get them on with it in place but I was wrong.

There is plenty of room in between the swing arm and the horn too. I jumped up and down on the seat while a friend made sure the horn was not being contacted by the swing arm.

One thing I recommend is that if you can, Square punch the hole in the tab before you weld it on to the battery box. This would enable you to use a carriage bolt to secure the horn to the bottom of the box.
This is a nice advantage because the bolt head, even though not directly below the battery could damage the bottom of the battery if the battery slides around a bit.  I cut a section of leather and folded it up underneath my AGM battery just incase.

And just like that, you have one loud ass horn!

[Porscheguy912]

More pics

[MoTo-BunnY]

I have that same horn but called the "Stebel Nautilus" (I've also seen it sold as the "Bad Boy"). It is L-O-U-D and has saved my butt a few times now from clueless drivers asleep at the wheel suddenly drifting over in unsignaled lane changes, etc. It really wakes 'em up, as they think they are about to be run over by a Mack truck or something. . he he he (evil bunny smirk)

[img width= height=]http://farm3.static.flickr.com/2753/4456517266_662ee5c809_o.jpg[/img]



You CAN mount it in the stock location (see older pict o' my bike, below) but it's real tricky as you have to mount it as high up and as tight against the frame as possible otherwise you will get a dent in your front fender the first time you hit a big bump (don't ask me how I know this. . . he he).

[img width= height=]http://farm5.static.flickr.com/4049/4456512132_bb14bc3fd2_o.jpg[/img]

Also, here are a few diagrams below that may help others in wiring these types of horns (as they require a direct power connection, relay, and big fuse to do it right as they use a LOT of juice. They are basically a mini air horn with built in air compressor.

[Porscheguy912]

Wow that looks like the same horn!
I wonder if it has the same tone or if it is at all different.

When i first saw your photo of your bike i thought you had mounted it inside of that fork bag!
(that's the stock location of the horn on the 78 750F)

Did you run a tube on the air inlet?

Thanks for the diagrams!

[MoTo-BunnY]

Wow that looks like the same horn!
I wonder if it has the same tone or if it is at all different.

When i first saw your photo of your bike i thought you had mounted it inside of that fork bag!
(that's the stock location of the horn on the 78 750F)

Did you run a tube on the air inlet?

Thanks for the diagrams!

Yeah, I have seen the same exact horn body style like these under like 3 or 4 different brands now?  lol  They even have them at Harbor Freight. Mine says Stebel Nautilus and Made in Italy on it. Also, is the only model I have seen in chrome?

LOL. . ..in the fork bag, eh? actually, I never thought of that and that certainly would have simplified things!

No, no tube on the air inlet as I didn't see the air inlet and also the instructions that came with it didn't say anything about doing so?

The diagrams were found on some guy's site where he put a similar horn on a Goldwing or something-I would give credit if I recalled where it was. (his name is on one of the diagrams, though).    They saved me a bunch of guesswork with the relay wiring and everything, for sure, so I thought I would share them here.

This loud horn mod is still one of my fave things I have done to my bike and has literally saved my tail from clueless, inattentive drivers. It's not just a macho thing or something, you REALLY need a loud horn to wake some of the ass clowns I have seen on the road with their stereos all bumping and #$%*, as they just start drifting over into your lane.


If anyone else is thinking of doing an aftermarket horn install, note a couple of things (that will save you a bunch of hassle):

1. the stock Honda horn setup uses the button with the ground on/off (unlike any aftermarket horn setups!) Wiring like you would THINK it should be will lead to a nasty surprise once you turn the key on and before you even touch the button (HOOOOOOOOOOOOOOONK!)

2. you will need thick wire, a good fuse setup, and a relay to do it all right. the relays are readily available for like $5 or less. I just happened to have an old VW one and they seem about all the same (down to the numbering on the terminals-see diagrams above)