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Horn mount part number?
#746389 08/22/18 3:16 am
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My 56 DB came in a scrambler setup, and if there was a horn and mount on it new, it was not in evidence when I bought it.
Looking through the BMS parts list, I cannot find any mention of one.
Does anyone know a part number and/or an illustration of one?

Thanks for any leads.

JR

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Re: Horn mount part number?
Jerry Roy #746399 08/22/18 5:08 am
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Originally Posted by Jerry Roy
Does anyone know a part number and/or an illustration of one?
If you mean #37, it's 42-9046.

What we learn from this is either a) I misunderstood your question, or b) you don't own a parts manual.

Attached Files horn.jpg
Re: Horn mount part number?
Jerry Roy #746478 08/23/18 1:39 am
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Thanks MM,

You answered the question to perfection, and the only parts list I have are the illustrated parts pictures in the BMS "The Gold Star Book".
And now I know what I am looking for. If worst come to worst, I'll make one.
Thanks again,

JR

Re: Horn mount part number?
Jerry Roy #746519 08/23/18 1:59 pm
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The horn mounts show up quite often and are pretty easy to locate. I prefer the mount with a kink in it. It will give you just a bit more room for the wiring. The straight one is a very close fit and leaves almost no room between the distance from the engine cases, frame tube and horn wiring terminals.

Dave

Last edited by ToolBox Dave; 08/23/18 2:03 pm.

1961 BSA DBD34 Clubman
1966 Triumph T120TT
1972 Rickman 250MX


Re: Horn mount part number?
ToolBox Dave #746529 08/23/18 3:44 pm
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Howdy Dave,

Since there only seems to be one mounting hole that goes on the through bolt of the frame. what keeps the mount from pivoting if the bolt gets a little loose?
Or is that an early warning method to indicate that it is time to go through and check all the nuts? laugh
There seems to be a reinforcing doubler piece on the bracket where the through bolt hole is. Does that lock against some part of the frame?
This is when it would be nice to have a stock one to kook at.

Thanks again

JR

Re: Horn mount part number?
Jerry Roy #746546 08/23/18 6:54 pm
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JR,

It is just a tight lock/split washer and a nut. It will stay tight without moving around but needs to be checked as with all bolts. The reinforcing doubler on the bracket is very much needed. It also helps with spacing or pushing the horn out a bit. Even with the doubler i have seen pieces that were re-welded at that spot. The horn is a pretty heavy and bounces around a bit. If you do a search on eBay for Lucas altette horn bracket you will see a bunch of different options. I like the stainless steel ones but that is just my opinion. The new Lucas themselves are also reproducing them and they are priced well. I have rebuilt a few horns so feel free to reach out if you have any questions. Also you must check out Taffthehorns.com. They/he is the person in the know on parts and restoration of the Lucas series of cycle and automotive horns and their history. They even will rebuild yours for you. My Altette horn is presumed original and does not have Altette stamped in the bezel ring. It had a black body and a silver tone disk. Some say the the body came silver or black. never seen a original silver one though. Tone disks for the BSA Gold Star were all rippled and silver to the best of my knowledge.

Dave

Last edited by ToolBox Dave; 08/23/18 7:12 pm.

1961 BSA DBD34 Clubman
1966 Triumph T120TT
1972 Rickman 250MX


Re: Horn mount part number?
Jerry Roy #746568 08/23/18 10:45 pm
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Originally Posted by Jerry Roy
This is when it would be nice to have a stock one to kook at.
Does the photograph below help? I don't know what bike it was originally was attached to.

Attached Files Horn.jpg
Re: Horn mount part number?
Magnetoman #746589 08/24/18 4:13 am
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Thanks Dave and MM,

From the picture that MM sent, and the picture in the BMS book, I will hazard the guess that the mount came as part of the horn, under it's number.

I gave some thought to making one out of 1/8 in stainless, just because it is less susceptible to fatigue cracking, and no problems with rust. Dunno yet
Anyway, both of you helped clear up my confusion. It is appreciated.

I got the engine in today. I rigged a tripod with a rope hoist above the bike, ran a strap up between the rocker cover, and it was enough offset so that the engine was centered when the strap was next to the frame
Kicked one leg of the tripod to move the support eye over from where I picked the engine up next to the bike. No scratches on the frame.
From there on, it was a doss, as our British members might say. thumbsup

JR

Last edited by Jerry Roy; 08/24/18 4:15 am. Reason: spelling error
Re: Horn mount part number?
Jerry Roy #746656 08/24/18 11:31 pm
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MM, that looks suspiciously like a Clearhooter.

Re: Horn mount part number?
Jerry Roy #746697 08/25/18 12:47 pm
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Horns are effectively a cantalever mounting and the mount vibrates a lot.
To prevent the mount from fatigue failures BSA ( at least ) spring treated their horn mounts so if you are thinking of having one made consider sending it out for heat treatment.
SO you are looking to make a single leaf spring.
As such it would be a good idea to have a chat to your heat treater first for suggestions about suitable grades of steel to fabricate it from.


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Trevor
Re: Horn mount part number?
BSA_WM20 #746761 08/26/18 12:48 am
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Thanks for the input Trevor

4130 steel is readily available, and can be hardened easily. Another route is to attach a rubber snubber to the free edge bearing against the engine case or frame.
I'll figure that out when I get the horn mounted.
Anyway, nice to know the spring scenario.

JR

Re: Horn mount part number?
Jerry Roy #746778 08/26/18 4:57 am
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Wow! Who knew horn mountings were so complicated. The need for that level of attention to detail - heat treating, etc, says the problem is really elsewhere, surely! Mass of the horn or engine balance?


No generalisation is wholly true, not even this one.
Oliver Wendell Holmes
Re: Horn mount part number?
Jerry Roy #746782 08/26/18 6:31 am
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Nothing is ever as easy as it looks.
So since when can you make a single cylinder engine that does not vibrate ?
Even on cars it is common to have horns rubber mounted to protect them from vibrations


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Re: Horn mount part number?
Jerry Roy #746786 08/26/18 9:24 am
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I agree - making the engine vibrate ain't easy (or even realistic, in the day)...though horn technology seems to have progressed - smaller, lighter, etc.


No generalisation is wholly true, not even this one.
Oliver Wendell Holmes

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