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Thread: Bosch Horn - no rivets, how does it come apart?

  1. #1
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    Bosch Horn - no rivets, how does it come apart?

    Next winter project - Fix the horn....

    Found many links on how to take apart the Bosch horns that are riveted together... but none for the style that I have. I've taken the nut off the back and have tried to unscrew/pry the front cover off, but it's seems to be very solid. It looks as though it's crimped on around the edges?

    Does the bolt go straight through to the front?
    I have not yet banged on the bolt with a hammer, should I?

    Anyone ever taken this one apart?
    photo.jpg

    Kevin
    R90/6 - 1976

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    Putty

    Also, does anyone know what the purpose of the grey rubber like substance is? I thought it was just on mine, but I've found one on ebay that has the same stuff in the same spot.

    http://www.ebay.com/itm/BMW-Bosch-Horn-R50-R60-R75-R80-R90-R100-/220898471150

    Kevin
    R90/6 - 1976

  3. #3
    Hopelessly lost subagon's Avatar
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    Kevin,

    First, I don't have an answer to your question

    What year bike is this horn from? Your sig line shows a '76 R90/6. I have a '75 R90/6 and can look and see if my horn is the same as yours and maybe get some ideas
    Mike Barfield - Plant City, FL
    '07 R1200 GS - '75 R90/6 - '93 R100GS PD - '71 R60/5 - 2 X '73 R75/5 LWB - '83 R80 ST
    Picts

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    same

    Hiya Mike,

    We have the same year
    Mine is from the end of the production year Dec. 1975, but the bike has had at least 2 owners before it came to me... not sure if it's the original horn or not. Thanks for checking!

    Kevin
    R90/6 - 1976

  5. #5
    Registered User lmo1131's Avatar
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    What does the other side look like?

    There is a small adjusting screw under the "goo"; or should be. It has a locking nut but it doesn't always prevent the screw from backing off. The "goo" does.

    The screw allows you to change the sound/volume of the horn.

    You will have to drill out the rivets, there's no other way to open this unit up. You can then use some machine screws with nuts to reassemble it. There's not much going on inside ... unless the coil wire is broken.

    EDIT - MY BAD. You have a late model horn; it can't be rebuilt. Time for new; they're like $25 anywhere.





    Hucky's sells a pretty close replica, I have one.



    I have one.
    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

  6. #6
    Hopelessly lost subagon's Avatar
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    The horn on my R90/6 looks just like yours. Lmo1131 had a lot of good information in his post. I noticed that my R60/5 has the /6 style horn, must have been replaced at some point. Guess if the R90/6 ever needs a horn I have a spare on-hand, I'll just replace the R6-/5 with one of the Hucky repos.
    Mike Barfield - Plant City, FL
    '07 R1200 GS - '75 R90/6 - '93 R100GS PD - '71 R60/5 - 2 X '73 R75/5 LWB - '83 R80 ST
    Picts

  7. #7
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    new

    well, looks like it's time for a new horn! maybe I'll get two.

    Thanks again for the help! Now I know it can't be serviced... I searched for hours trying to find info on that horn and could only ever find info on the ones with the rivets that CAN be serviced.

    Kevin
    R90/6 - 1976

  8. #8
    Registered User lmo1131's Avatar
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    You need to spend some time at the MAXBMW site reading through their microfiche. Other on-line dealers have the same resource; I just use MAX's most.

    Here's the part number for their replacement horn

    14 61 33 1 243 486

    Here's the horn





    But frankly, there are much better horns available. Maybe some of the others will chime in on the subject. It doesn't have to have B-O-S-C-H stamped into it.
    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

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