Hella twin-tone horn

[jtk1531]

finally managed to replace the original horn which everyone on the road was ignoring anyway.
bought a Hella twin-tone set, comes with 2 snail type horns + one 30amp relay. used it in various cars and bikes for the past 6-7years without any problem. air-horns are difficult to find here, and i don't want to deal with international shipping if i can avoid it.

couldn't bear the agony of removing the side fairing again, so i installed it at the same Y bracket that the original horn was mounted.
plenty of clearance from the top of the front mudguard.
L shaped terminal connectors are definitely required as there isn't much clearance between the plastic guard (lower triple-tree) and the horn. i didn't want to bend the horn terminals. i used the yellow connector with the insulated portion cut off.

some pics of how it was mounted attached.
14 gauge wire used, instruction sheet says 16amp fuse required.

[Phil]

I had looked at the Hella horn kit was was concerned with the thickness of the horns hitting the fender if the shocks ever bottomed out.  After researching it more, I found the Stebel HF/2 hi/lo horn set, which is made up of Stebel HF80 340Hrz & HF80 430Hz horns.  They are thinner by 44 mm and draw

I found this set had a thinner profile, draw 3 fewer amps, and are actually louder by 2 dB.  Here are the specs of 3 horns.

Comparison Specs:
Stebel Nautilus Compact Air horn
Stebel HF 80/2 Twin electric
Hella Twin-tone Horn Set

Stebel Nautilus Compact Air Horns (Model 11690051)
Loudness:  115 dB
Tones:  530 Hz & 680 Hz.
Current:  18 Amps
Dimensions:  150 x 112 x 95mm
Located behind the radiator, or stuffed up high and mounted on
the forks.  Note: Lack of a suitable location will lead to loss in effective loudness.

Stebel HF 80/2 Twin electric horns
Loudness:  112 dB
Tones:  340 Hz & 430 Hz
Current:  9 amps (pair)
Dimensions:  38 mm x 80mm diameter   (Measured)

Located at factory horn location
Found on ebay for $40 for the pair separately.  Murphs Kits $39.95. 

Hella Twin Tone Horn Set
Loudness:  110dB
Tones:  400 Hz & 500 Hz
Current:  12 amps (2 x 72W)
Thickness:  82mm 

Sources
Stebel: http://www.stebel.it/public/stebel.pdf
Hella:  http://www.myhellalights.com/index.php/default/horns/twin-trumpet-horn/