Hi forum members,
if there is anyone out there who might have the schematics for the HF1441 horn Please email or post the details as I have one that's been pulled apart and I'm unsure how it all fits together? Main concern is where the three 1" discs with a 1/4" dia hole fit. The only identifying number I can find is 700322 inside the casing (if that helps ??) The horn, which comes as part of a 1942 WM20 I'm restoring looks like pictures I've seen of the HF1441 rather then the HF1235 which is supposed to be on this model.

email (option): lxmrtn55@gmail.com

Hope this helps...

email (option): wd.register@gmail.com

Thanks for the quick reply Jan.
Would you have schematics for the HF1441 horn as well? There is a little bit of difference in the construction between the HF1234/1235 and the 1441.
I hope the photo of the parts comes through....first time using imgbb....
There is a large outer disc which fits outside the diaphragm and three smaller discs inside, with a clamp holding the diaphragm to the horn body. the correct position of the three small discs is my problem!

email (option): lxmrtn55@gmail.com

Hi Alex.
You can download the Lucas HF1440-41-44 Workshop Instructions from The Magneto Guys website at www.brightsparkmagnetos.com/library/Workshop%20Instructions/index.htm
Hope this helps.
Nick

Thanks Nick, everything helps.
I've checked out the 1440-1-44 schematics on the website and now I'm really confused. From teh outside my horn looks like a 1441 with the outer clamp over the diaphragm rather than the screwed face of the 1234-5 horns but internally its quite different, and as you can see from my photo there are three discs which i'm trying to work out where they go. So clearly i have another model which just looks like the 1440....
But hey -its not rocket science - i'll just keep trying different configurations til it works. Ignorance is bliss.

email (option): lxmrtn55@gmail.com

Your photo is not showing for me? Have you checked out "electrical" in the technical section of this site. It might help ID your horn. Lucas horn numbers are very confusing!! I think the HF1440-1-4 are post war models. The wartime models which I have on two of my bikes are HF1140 and 1141. Ron

email (option): ronpier@talk21.com

G'day Ron.
confusing is hardly the word! Not sure why my photo isnt showing for you as it comes up in preview and when i reply....????

I did check out the electrical section of the website and found it really good which then led on to Lucas E and F website PDFs and a multitude of photos of various HF horns. The 1441 looks on the outside like the 1140-1's. The 1140 has the same dome nut and outer disc and clamp as the 1141 but the terminals are on the side whereas the 1141 terminals are at the back. is this what you've got?

in my photo it shows the dissembled horn from front to back and it is very much like the photo of the HF1141 in the Electrical section only repainted in matt green, with the terminals at the rear. In the Lucas parts pdf (Section F) the re is a breakdown of parts but not for the 1141-1 horns. However the diaphragm (700714) and outer disc (700728) match mine and my casing /backplate has the number 700322 stamped on the inside(?)
on Lucas Horns Parts List page F3 there is an anomalous reference to HF1140 as the model is not mentioned anywhere else that I could find.

bottom line - where do the three small discs sit in relation to the base plate,the diaphragm and the outer disc?

I think I've worked it out by trial and error but its galling to not be able to find the schematics and be able to find that particular model!
If you do have an exploded view of the two horns please let me know before I run a current through my horn and blow a fuse or burn something out. (apart from my peanut brain!:confounded: )

email (option): lxmrtn55@gmail.com

Unfortunately I haven't got any dismantled pictures. I try to only buy working horns and then do the minimal amount of disassembly for painting them.

Yes the earlier model 1140 has the terminals on the side, the 1141 are on the back. As far as I know, these are the two war time models of this design.......The Altette's are a whole other kettle of fish. Ron
PS, email your picture to me if you want and I'll post it.

email (option): ronpier@talk21.com