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Old 19-03-17, 08:59 AM   #1
DryRob
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Default Replacing the horn

My horn seems to be on it's way out so I've decided to replace it with something a bit louder.
Can I stick anything that's 12V on?
I was thinking of going to a scrap yard for a car horn
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Old 19-03-17, 09:14 AM   #2
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Default Re: Replacing the horn

Can't see why not if it fits, they all work the same way

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Old 19-03-17, 10:23 AM   #3
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Default Re: Replacing the horn

If a new horn is louder it's either more efficient or, more likely, it's drawing more current. On a brief google, a typical bike horn is about 2.5A and a typical car horn is about twice that. It would be safest to replace your old horn with a relay and then use the relay to switch the new horn. Doing it that way would enable you to fit air horns and play "La Cucaracha"!

The relay would be available from Halfords/anywhere and would cost 6 ish.

Last edited by Seeker; 08-11-17 at 03:34 PM.
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Old 19-03-17, 11:42 AM   #4
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Default Re: Replacing the horn

I used a Stebel Nautilus, split the compressor from the horn and used the relay supplied with it, as above.

Compressor in the seat unit, horn in the fairing, connected by some plastic tubing.

Much louder than stock
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Old 19-03-17, 12:36 PM   #5
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Default Re: Replacing the horn

As maviczap says.If you use a high powered one watch the current draw.

I have an older single Stebel on a CX500 which didn't need a relay as it came as a pair which would have needed a relay.

I'd take a punt on one of these:Advertised @115 Db.

5.95

http://www.ebay.co.uk/itm/12v-Replac...cAAOSwmLlX83AI

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Old 19-03-17, 02:34 PM   #6
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Default Re: Replacing the horn

Ive got a genuine pointy horn you can have for 5 + p&p
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Old 19-03-17, 08:28 PM   #7
Adam Ef
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Default Re: Replacing the horn

Are you sure it's on it's way out? The screw on the back of mine drifts undone sometimes and then then rise in temp from the radiator causes it to stop working mid rides. Took me a while to work out why it worked on startup all the time and stopped once warm. The heat was enough to make the misadjustment slightly worse to the point that it didn't function. Once I readjusted the screw it was all good again.
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Old 19-03-17, 09:27 PM   #8
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Default Re: Replacing the horn

I got this:

http://www.ebay.co.uk/itm/221675979432

Like Maviczap's suggestion, but cheap and comes with the required relay. It can be mounted without splitting it but it's neater if it is. Mine isn't split, mounted on a custom bracket hanging off the side of the radiator near where the original was. The relay is mounted on the original horn bracket.

They do wear out quite quickly though. I'm on my third in about 5 years. The first was a genuine Stebel. From what I can see there's barely any difference between these and the cheap copies.
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Old 20-03-17, 08:28 AM   #9
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Default Re: Replacing the horn

Yeah, twice I've pulled up alongside a car and tooted my standard horn and they haven't noticed at all. I want something very loud but very compact to replace it.
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Old 20-03-17, 09:45 AM   #10
DryRob
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Default Re: Replacing the horn

Quote:
Originally Posted by Adam Ef View Post
Are you sure it's on it's way out? The screw on the back of mine drifts undone sometimes and then then rise in temp from the radiator causes it to stop working mid rides. Took me a while to work out why it worked on startup all the time and stopped once warm. The heat was enough to make the misadjustment slightly worse to the point that it didn't function. Once I readjusted the screw it was all good again.
That's more or less the problem, I'll have a look tonight.
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