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Lucas Horn Repair? #330102
08/26/10 6:51 pm
08/26/10 6:51 pm
Joined: Dec 2009
Posts: 10
Texas
D
DavidH Offline OP
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DavidH  Offline OP
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Joined: Dec 2009
Posts: 10
Texas
I'm closing in on completing the restoration of my 1966 T120R, and finally got around to reinstalling the horn. This is the original Lucas 8H, and it seems in good shape except for its refusal to make noise.

Unlike the earlier Altette, the 8H is riveted together and perhaps not intended to be serviced - but it's easy enough to drill out the rivets and poke around. Before I do, is there anyone who's done this and has experience to share?

(I know there are millions of replica/substitute horns available, most of which work - but I want to keep the original 8H if possible.)

Cheers,

Dave

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Re: Lucas Horn Repair? [Re: DavidH] #330111
08/26/10 8:18 pm
08/26/10 8:18 pm
Joined: Mar 2006
Posts: 3,679
gastonia nc
R
raf940 Offline
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raf940  Offline
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Joined: Mar 2006
Posts: 3,679
gastonia nc
i did it.........drill out rivets...carefully pry apart the two halves...there are points in there like Lucas fuel pump points...clean points...clean out dirt etc. inside shell...there is a little piston that might be frozen in there...use a little dab of WD40 to clean it so it moves freely...it moves up and down in response to electrical impulses and makes the diaphram move up and down and that makes the noise...put a teeny smear of silicon on the halves and bolt them back together with little tiny bolts and nuts...
you adjust the sound with the screw on the back...hook it up and push the horn button and turn the screw til it is at the loudest .......to tell you the truth i was not impressed by the bleeting so i got a horn off eBay for $10 from a Hinckley triumph and painted it flat black and hid it under the steering head on my A65 and it is loud and shrill and the Lucas one is just for looks........PS google Taffthehorns.com

Last edited by raf940; 08/26/10 8:20 pm.

1972 Triumph T120
1968 BSA A65
1968 MGB Roadster
1979 Chevrolet Camaro Berlinetta
1969 Honda Mini Trail
1939 farmall f30 tractor
2004 Honda Shadow Aero
1972 BSA Thunderbolt
1975 yamaha xs650b
1972 Norton commando project
Re: Lucas Horn Repair? [Re: DavidH] #330463
08/28/10 9:47 pm
08/28/10 9:47 pm
Joined: Mar 2003
Posts: 39
Texas
D
DH Offline
BritBike Forum member
DH  Offline
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Joined: Mar 2003
Posts: 39
Texas
David:
I have restored many sets of Clear Hooter Windtones, and they are also riveted together. I have found that using drive rivets work very well and the heads look like the original rivets. Drive rivets have a rivet head and the shank has a spiral type thread that screws into the housings. Drive rivets are easily available. I even powder coated the rivet heads before installing the rivets...now that is way over the top. Good luck

Dave
T120C
Texas

Re: Lucas Horn Repair? [Re: DH] #330500
08/29/10 4:04 am
08/29/10 4:04 am
Joined: Sep 2006
Posts: 731
Melbourne Fl
T
Terry_tr6 Offline
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Terry_tr6  Offline
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T
Joined: Sep 2006
Posts: 731
Melbourne Fl
the Stebel is the way to go.
http://www.amazon.com/Stebel-Nautilus-Compact-Motorcycle-Horn/dp/B000NPRTII
amazingly small but LOUD

Re: Lucas Horn Repair? [Re: Terry_tr6] #330503
08/29/10 6:35 am
08/29/10 6:35 am
Joined: Dec 2009
Posts: 10
Texas
D
DavidH Offline OP
BritBike Forum member
DavidH  Offline OP
BritBike Forum member
D
Joined: Dec 2009
Posts: 10
Texas

Thanks to all for the input. I opened up the horn, and found all it needed was for the points to be cleaned with fine sandpaper. It's back together, on the bike and works. As a bonus, it polished up pretty well - I thought I'd have to replate it or paint it. Here are some pics:

Lucas 8H 1
Lucas 8H 2
Lucas 8H 3

Cheers,

Dave


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