Airhorn replacement

The "Pimp my Ride" section for Soviet bloc bikes. Everybody seems to have their own custom add-ons, modifications & accessories. Share your tips and post pictures of them here.
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Lokiboy
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Airhorn replacement

Post by Lokiboy » Thu Nov 08, 2018 4:02 pm

Recently installed a Samgar 130db Airhorn. Bought off eBay for $15 (one I bought didn’t come with a relay or wiring harness). https://www.amazon.com/dp/B074NBJFRM/re ... 7240a09845

- Incredible sound
- uses existing spade connectors

Took a piece of aluminum and mounted the horn on the support strut. Reason being, not enough clearance between the fender using original OEM horn location, and in addition, the wires were too short to reach and I didn’t feel like doing any surgery to lengthen them. Mounting on the strut solved both problems.

Sounds louder in person: https://youtu.be/fpqPUqVKYiI


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Last edited by Lokiboy on Fri Nov 09, 2018 10:39 am, edited 3 times in total.
2011 Gear Up - "Erika"
Yorktown, VA

Mains: 127, Idle: 40, Needle: 1 shim
MKIII air filter
80,000 km and counting

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Snakeoil
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Re: Airhorn replacement

Post by Snakeoil » Thu Nov 08, 2018 4:36 pm

Sounds good. A relay may be required, however. The purpose of the relay is to handle the current load rather than the contacts on the switch. Assume that the air horn has an electric motor and a blower so probably a higher load than the OEM horn. Might worth the effort to put an ammeter in the circuit and test both horns to compare. The argument against that is you don't use your horn very much so might be years before the contacts are damaged.
Regards,
Rob
Proud member of the Peanut Gallery
2000 Ural Tourist
40 Pilots, 122 Mains
Before you say something stupid, always ask yourself, "What would Harpo say?".

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Lokiboy
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Re: Airhorn replacement

Post by Lokiboy » Thu Nov 08, 2018 4:45 pm

Snakeoil... Everything you said maybe true, but I know nothing about electronics (it all sounds Greek to me). For this I’ll stick with “ignorance is bliss.” :D
2011 Gear Up - "Erika"
Yorktown, VA

Mains: 127, Idle: 40, Needle: 1 shim
MKIII air filter
80,000 km and counting

rivers
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Re: Airhorn replacement

Post by rivers » Thu Nov 08, 2018 6:18 pm

Loki, looks good...But... a horn is a high load/ current draw accessory. You really do want to run the load through a relay and just trigger the relay with your Ural (switch) rather than running the main power/current load through the switch directly to the horn. Your switch gear and stock barely adequate Russian wiring will thank you. Plus your horn will work crisper, cleaner and louder. For high current loads "relays are your friends".
According to the ebay pics the horn did come a a relay(for a reason) :) If you didn't get one with the horn just pick up a generic common 12v 30/4A automotive relay from any auto parts store. For a horn it don't need to be a deluxe crazy expensive Bosch/Rolls Royce etc brand. A cheap $8 genuine China/Taiwan relay is all you need. I'm no electric guru by anyones stretch of the imagination but over the years have learned after much critical magic smoke escaping($$) from my wiring, relays really are our friends.
Joe
014 GU
"I'm lost but I'm making good time."

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Lokiboy
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Re: Airhorn replacement

Post by Lokiboy » Thu Nov 08, 2018 6:39 pm

Hummm... it seems I selected the wrong link. Naturally I can’t find the correct one now. Anyway, mine didn’t come with any relay nor was it on the EBay listing. Oh well.
2011 Gear Up - "Erika"
Yorktown, VA

Mains: 127, Idle: 40, Needle: 1 shim
MKIII air filter
80,000 km and counting

DneprTim
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Re: Airhorn replacement

Post by DneprTim » Thu Nov 08, 2018 6:52 pm

I wonder if Ural already uses a relay for the horn ?
Anybody got a wiring diagram to check ?

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Snakeoil
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Re: Airhorn replacement

Post by Snakeoil » Thu Nov 08, 2018 6:52 pm

But... a horn is a high load/ current draw accessory.
Maybe yes, maybe no. Most motorcycle horns do not draw a lot of current so horn relays are not common on bikes. But I would expect that the current draw on that air horn is higher than a simple vibrating coil type horn.

By coincidence, I just happened to measure the current on the 4 fused circuits on my Tourist in response to a thread in the Newbie's section on 650 electrical and fuse ratings. In the case of my 2000 Tourist, the current load on the circuit for the horn and the brake lights with both on was 4.6 amps. That's a long way from the 15 amp rating of 14 gauge wire.

So, since I am a crusader against ignorance because I believe it is not bliss, but rather an invitation for disaster, I looked up an equivalent horn, a Wolo, of which your Sakapoopi brand seems to be a knock-off. That horn comes with a 30 amp relay, which is clue number 1. Clue number 2, which is painfully obvious, is the specs say that the horn draws 16 amps. So you are already 1 amp over the rating of 14 ga circuit wire just by blowing the horn. That same circuit has your brake lights included. So, blowing the horn and stepping on the brakes means even more current thru that 14 ga wire. And lets add to this that your particular horn was probably made in China by prisoners so the efficiency and hence amp draw of the compressor motor is probably higher.

Your bike, your call, your fire. But Old Man Rivers is right on the money! :cheers:
Regards,
Rob
Proud member of the Peanut Gallery
2000 Ural Tourist
40 Pilots, 122 Mains
Before you say something stupid, always ask yourself, "What would Harpo say?".

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Lokiboy
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Re: Airhorn replacement

Post by Lokiboy » Thu Nov 08, 2018 6:57 pm

Great, now I’ve got to figure out how to install a relay. Thanks for the insights.

Update: I’ve since ordered a wiring harness and relay
Last edited by Lokiboy on Thu Nov 08, 2018 7:32 pm, edited 1 time in total.
2011 Gear Up - "Erika"
Yorktown, VA

Mains: 127, Idle: 40, Needle: 1 shim
MKIII air filter
80,000 km and counting

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Tomcatfixer
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Re: Airhorn replacement

Post by Tomcatfixer » Thu Nov 08, 2018 7:28 pm

Hmm... if only you knew someone nearby that recently installed upgraded horns and a horn relay... :oops:
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2018-11-08 18.24.59.jpg
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Oh that's right! I did! :lol:
If you want help installing a horn relay, just let me know. Piece o' gluten-free cake. :wink:

Nice work on the horn install. Jeez, new brighter headlight, new louder horn... Erika is one 'yorange' paint job from being completely conspicuous! :lol:
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- Chad

Virginia Beach, Virginia, USA

Current rides:
2015 Ural cT "Mobile Chernobyl", 2001 Ural Patrol "Britney", 1999 Ural Tourist "Desert DisGrace: the Iron (Oxide) Curtain", 1994 Honda VFR750F, 1986 Yamaha FZX700S Fazer

Previous rides:
2007 Honda VTR1000 FireStorm (Super Hawk in U.S.)
2001 Buell Blast! - - - - - - - 2005 Yamaha FJR1300
1993 Honda CBR600F2 - -1984 Yamaha FJ1100
1986 Yamaha FZX700S (a different one than above)

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Lokiboy
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Re: Airhorn replacement

Post by Lokiboy » Thu Nov 08, 2018 7:33 pm

Tomcatfixer wrote:
Thu Nov 08, 2018 7:28 pm
Hmm... if only you knew someone nearby that recently installed upgraded horns and a horn relay... :oops:
-
2018-11-08 18.24.59.jpg
-
Oh that's right! I did! :lol:
If you want help installing a horn relay, just let me know. Piece o' gluten-free cake. :wink:

Nice work on the horn install. Jeez, new brighter headlight, new louder horn... Erika is one 'yorange' paint job from being completely conspicuous! :lol:
I’ll get up with you as soon a I buy a new fire extinguisher :lol:
2011 Gear Up - "Erika"
Yorktown, VA

Mains: 127, Idle: 40, Needle: 1 shim
MKIII air filter
80,000 km and counting

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Tomcatfixer
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Re: Airhorn replacement

Post by Tomcatfixer » Thu Nov 08, 2018 7:37 pm

I’ll get up with you as soon a I buy a new fire extinguisher :lol:
a04c1a458b9c3db9512bb5706f2ac1e6.jpg
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- Chad

Virginia Beach, Virginia, USA

Current rides:
2015 Ural cT "Mobile Chernobyl", 2001 Ural Patrol "Britney", 1999 Ural Tourist "Desert DisGrace: the Iron (Oxide) Curtain", 1994 Honda VFR750F, 1986 Yamaha FZX700S Fazer

Previous rides:
2007 Honda VTR1000 FireStorm (Super Hawk in U.S.)
2001 Buell Blast! - - - - - - - 2005 Yamaha FJR1300
1993 Honda CBR600F2 - -1984 Yamaha FJ1100
1986 Yamaha FZX700S (a different one than above)

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Snakeoil
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Re: Airhorn replacement

Post by Snakeoil » Thu Nov 08, 2018 8:14 pm

You have Chad as your guide. But this is a simple mod that requires one additional wire.

Connect the input side of the relay to the horn wires. Might need a ground. I've never looked. Run a hot wire from the battery to the output side of the relay and another wire from the other relay output side to the horn. Ground the horn if not already grounded. You could put a 20 or 25 amp fuse in the feed from the battety to protect the relay. Use 12ga. wire for the feed to the relay and from relay to horn. Also 12ga. from horn to ground if horn does not ground thru mount.
Regards,
Rob
Proud member of the Peanut Gallery
2000 Ural Tourist
40 Pilots, 122 Mains
Before you say something stupid, always ask yourself, "What would Harpo say?".

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Re: Airhorn replacement

Post by INSUBORDINATOR » Fri Nov 09, 2018 1:46 pm

Various small Air horn pumps draw different amps. On my previous 1994 Ural 650, I tried several of the pumps I'd collected over the years, & used the one that worked LOUD with very little delay & no relay. I never had a problem with it without a relay. I was not happy with one of the BADBOY folded compact air units. The small sports car Fiamms I had - did fine. Now I'm satisfied using a FIAMM "hi note" electro magnetic snail horn on my present Ural.
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Snakeoil
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Re: Airhorn replacement

Post by Snakeoil » Fri Nov 09, 2018 7:40 pm

Measuring the current draw with your horn will tell you what you need to know.
Regards,
Rob
Proud member of the Peanut Gallery
2000 Ural Tourist
40 Pilots, 122 Mains
Before you say something stupid, always ask yourself, "What would Harpo say?".

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