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Richard Phillips
Richard Phillips
San Luis Obispo, CA
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74 Commando Horn
#740434 07/01/18 7:03 pm
Joined: May 2007
Posts: 10,954
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Moto Mojo
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My horn is dismal at best, I can hear it fine sitting still but even moving a little bit, the sound just disappears. I guess the mount is up under the rear wheel fender, beneath or behind the battery box? In a PIA location is the best I can get from asking. Posted some stuff on the F ace ok Commando page asking what folks have done and got many many smart ass answers with not a lot of helpful info. One guy did send me some pix on fa ce book messenger of mounting small air horns up under his seat somehow but these pix are tough to see whats what.

Its not a huge priority but at some point, I'd like to addresss this. Thought I'd ask what (if anything) people are doing or have done to "fix" the seemingly crappy Commando horn situation without mounting massive horns where they can be seen?

Thanks in advance for not posting wise ass comments. grin


"It is no measure of health, to be well adjusted to a profoundly sick society."

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Re: 74 Commando Horn
ricochetrider #740437 07/01/18 7:39 pm
Joined: Sep 2007
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The original location is dismal, so I opt for altertive locations. In the past, I have mounted them to the front tank mounts, with the trumpets pointing forward. Gives good sound dispersion, but is susceptible to rain water.

On the most recent Commando, I used FIAM horns (no trumpets), and installed them one on each side, just to the rear of the seat knobs.

.. Gregg


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Re: 74 Commando Horn
ricochetrider #740451 07/01/18 9:22 pm
Joined: Aug 2001
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Twin fiaams, one bike on brackets hanging below coil bracket. From where reflector would mount.

Other bike used standoff brackets from air filter plate.


Rich (last remaining member ThreeMustGetBeers)
"It's not always about going fast. Sometimes it's nice to slow down" (Wendy E.2016)

69 bonney
72 commando
75 commando interstate
06 Suzu..Suzu.. uh appliance
couple of beesas a ducati
and the Snake Bike
and a Honda?
Re: 74 Commando Horn
ricochetrider #740490 07/02/18 8:24 am
Joined: Nov 2009
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The position of the horn may be awkward, the advantage (if any) is that it is out of sight, most alternative solutions that I have seen stick out like a sore thumb.

In my "smart ass" reply to your question on Face ache, I mentioned that the original horns can usually be repaired, just drill off the rivets. clean the internals, that often suffer from water ingress, and reassemble the thing with small screws and nuts.



Peter.
1974 Commando 850
1972 Trident T150T
1961 Goldie DBD34
1969 Benelli 250 sport special
Re: 74 Commando Horn
ricochetrider #740498 07/02/18 1:27 pm
Joined: Jul 2011
Posts: 10
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I went to harbor freight and bought their dual horn set. It is chrome but I painted them black and mounted them to the air filter back plate. Being black they kinda disappear and they are real loud. Makes me laugh at how loud they are. $10 at harbor Freight


'71 Bonnieville
'73 Commando Roadster
'74 Commando Roadster
Robbing the '73 for parts to keep the '74 on the road.
Re: 74 Commando Horn
Peter R #740500 07/02/18 1:36 pm
Joined: May 2007
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Moto Mojo
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Originally Posted by Peter R
The position of the horn may be awkward, the advantage (if any) is that it is out of sight, most alternative solutions that I have seen stick out like a sore thumb.

In my "smart ass" reply to your question on Face ache, I mentioned that the original horns can usually be repaired, just drill off the rivets. clean the internals, that often suffer from water ingress, and reassemble the thing with small screws and nuts.



Peter, thanks for making one of the few sensible comments over there. At some point, I'll address this issue, and will definitely look at repairing the original horn. I do have two BIG, RED Fiamm horns. I'd love to use them, but sure don't want them to be "sticking out like a sore thumb".


"It is no measure of health, to be well adjusted to a profoundly sick society."

Re: 74 Commando Horn
ricochetrider #740507 07/02/18 2:30 pm
Joined: Aug 2012
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Here are 2 horns I have been thinking about. Right now I am using a horn off my BSA mounted between the coils.
http://www.aerostich.com/ear-cannon-air-horn.html
http://www.aerostich.com/fiamm-freeway-blaster-horn.html

I am looking for a place to keep horn a bit out of sight.


Bill
1974 Norton Commando
1966 Lightning
1965 Lightning Rocket
1966 Norton Atlas
1967 Norton Atlas
1948 Panhead
Re: 74 Commando Horn
ricochetrider #740525 07/02/18 5:02 pm
Joined: Dec 2011
Posts: 60
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I replaced the original horn with a pair of used horns from a 2002 Subaru Forester. I chose them because of their small size and one has a high note and the other a low note. To install them I moved the mounting holes on the horns' stocks 3/4 of an inch inboard and then shortened the stocks accordingly. I fabricated a couple of angle brackets that mount the horns to the same place as the original. I also welded a couple of tabs on the new brackets so that the mounting bolts won't turn. That way you don't need a wrench to hold the heads of the bolts.

The horns can be repositioned on the stocks in 90 degree increments if desired. However, make sure that the adjusting screws do not turn at all. Also I used a relay which was more or less required in my installation because I rewired my bike using an ammeter. One advantage to this horn installation is that the return oil hose can be routed in a much more natural position without any sharp bends to the oil tank.

Getting to the horn is really not that difficult. You need to remove the rear wheel and then the rear fender. It should only take maybe 20 minutes to do that. Probably the hardest part of the whole deal is disconnecting the wires at the tail light assembly (wires could be delicate and possibly break in that area). It is pretty straight forward.

Here are a couple of pictures of my Subaru horn 'upgrade':


Sideview:

[Linked Image]


Rear View:

[Linked Image]


I hope this gives you some ideas,

Peter Joe

Re: 74 Commando Horn
ricochetrider #740589 07/03/18 5:02 am
Joined: Jul 2011
Posts: 10
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That is a nice setup. When I get my e start I'll have to move mine. If I can fit them then thats where I'll put them. Clean bike!


'71 Bonnieville
'73 Commando Roadster
'74 Commando Roadster
Robbing the '73 for parts to keep the '74 on the road.

Moderated by  Dave Comeau 

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