Honda-SOHC

SOHC.co.uk Forums => CB500/550 => Topic started by: bbrian66 on March 28, 2026, 03:22:38 PM

Title: Cb550 F2 Horn Mounting
Post by: bbrian66 on March 28, 2026, 03:22:38 PM
Hi All

Does anyone have images of how the horn should mount on a 550 F2? I think I must be missing some parts. I've attached a photo of my frame.  Is this where it should go?

Thanks
Bbrian66
Title: Re: Cb550 F2 Horn Mounting
Post by: mickwinf on March 28, 2026, 03:55:20 PM
no thats where the coils mount. horn mounts on a small bracket with 2 screw holes in front of downtubes, just out of sight on your pic. will see if i can find a pic
Title: Re: Cb550 F2 Horn Mounting
Post by: mickwinf on March 28, 2026, 04:04:16 PM
here you go look just under the rh indicator and you can see the horn
Title: Re: Cb550 F2 Horn Mounting
Post by: bbrian66 on March 28, 2026, 04:29:46 PM
Thanks Mick. What i need is to understand how the horn mounts to the frame.
Title: Re: Cb550 F2 Horn Mounting
Post by: Bryanj on March 28, 2026, 04:58:52 PM
Look up the parts list on cms
Title: Re: Cb550 F2 Horn Mounting
Post by: bbrian66 on March 28, 2026, 05:10:34 PM
Quote from: Bryanj on March 28, 2026, 04:58:52 PM
Look up the parts list on cms
Thanks - I have,  but it doesn't show where the horn mounts or what it bolts to. I acquired this bike completely dismantled and many parts missing. Some areas are really not obvious.
Title: Re: Cb550 F2 Horn Mounting
Post by: Sesman on March 28, 2026, 05:20:22 PM
Like dis…..
Title: Re: Cb550 F2 Horn Mounting
Post by: Sesman on March 28, 2026, 05:29:21 PM
BTW. The horn is only loosely mounted as I’m refurbishing….before anybody comments.
Title: Re: Cb550 F2 Horn Mounting
Post by: bbrian66 on March 28, 2026, 05:42:59 PM
Ok that makes sense.  But my frame has no mounting holes in this area. Any ideas why not?
Title: Re: Cb550 F2 Horn Mounting
Post by: bbrian66 on March 28, 2026, 05:43:48 PM
Is the F2 frame different to the others?
Title: Re: Cb550 F2 Horn Mounting
Post by: Bryanj on March 28, 2026, 05:59:16 PM
What is the frame number?
Title: Re: Cb550 F2 Horn Mounting
Post by: Sesman on March 28, 2026, 06:25:45 PM
That picture I supplied is from a 1977 F2. I’m not totally convinced that the frame section you have photographed is original, but I’m definitely not an expert.
Title: Re: Cb550 F2 Horn Mounting
Post by: bbrian66 on March 28, 2026, 07:00:38 PM
Quote from: Bryanj on March 28, 2026, 05:59:16 PM
What is the frame number?
2110300.
Title: Re: Cb550 F2 Horn Mounting
Post by: Oddjob on March 28, 2026, 07:24:29 PM
Looks like the frame has been either damaged in the past or the bolt holes have been filled in.
Title: Re: Cb550 F2 Horn Mounting
Post by: Sesman on March 28, 2026, 07:36:03 PM
I tend to agree, Ken. The welding around the brace is about as bad as I’ve seen….cosmetically that is. It certainly doesn’t look original and the heavy paint coating can’t hide it. I’ll take some detailed photos of mine tomorrow with the horn off for comparison.
Title: Re: Cb550 F2 Horn Mounting
Post by: bbrian66 on March 28, 2026, 07:55:20 PM
Thank you guys. I wondered if the holes had been filled in.  I'll take a better look tomorrow.
Title: Re: Cb550 F2 Horn Mounting
Post by: McCabe-Thiele (Ted) on March 28, 2026, 08:09:15 PM
Theses photos might help, one shows the horn in place with the bracket, other shows the front mounting point on the right side of my frame. Zooming in is required. The parts manual might also show the frame mounting points - not checked that.

#(https://live.staticflickr.com/65535/55173861843_e47783556f_b.jpg) (https://flic.kr/p/2s4wsU4)52670411081_9c2f8607e9_b (https://flic.kr/p/2s4wsU4) by Macabe Thiele (https://www.flickr.com/photos/187487200@N03/), on Flickr

#(https://live.staticflickr.com/65535/55173936064_17e3bde1da_b.jpg) (https://flic.kr/p/2s4wQXJ)500 horn mount (https://flic.kr/p/2s4wQXJ) by Macabe Thiele (https://www.flickr.com/photos/187487200@N03/), on Flickr

Title: Re: Cb550 F2 Horn Mounting
Post by: McCabe-Thiele (Ted) on March 28, 2026, 08:38:53 PM
In the 500 downloadable manual here F36 Page 140 shows the frame horn mounting.
My bare frame photo is a side shot so is of no help.
Title: Re: Cb550 F2 Horn Mounting
Post by: bbrian66 on March 29, 2026, 06:22:31 PM
 Hi Ted - many thanks for sharing this. I've been through all of the downloadable manuals on this site and I can't find anything that matches the reference you quote.

I'm really stumped why my frame should have lost the horn mounting. I've taken a couple of much clearer pics of the frame. Despite  all the helpful images posted on here, I still can't see exactly what I'm missing. Should there be something welded across the front of the frame to take the horn?
Title: Re: Cb550 F2 Horn Mounting
Post by: Nurse Julie on March 29, 2026, 06:29:38 PM
I found this photo on tinternet, it may help. You have the bracket that's welded to the frame missing. The horn bolts to the bracket.

[attachimg=1]

[attachimg=2]
Title: Re: Cb550 F2 Horn Mounting
Post by: Nurse Julie on March 29, 2026, 06:38:51 PM
On this photo, you can see where the bracket is welded to the frame, the bracket on this one has snapped off and all that's left is the stub. It looks like yours has snapped off where it actually joins the frame.

[attachimg=1]
Title: Re: Cb550 F2 Horn Mounting
Post by: McCabe-Thiele (Ted) on March 29, 2026, 06:55:33 PM
This photo shows the bracket as seen from the right side of the frame, to the left of the lower steering shaft bearing.
IIRC the lug is only welded on the right side of the frame (consistent with your frame that shows the welded up lug point), the integrated bracket provides the second mounting hole to the right side.

The Chassis plate on my frame  is clearly not an original fitting btw.

#(https://live.staticflickr.com/65535/52526719149_e334fb9808_b.jpg) (https://flic.kr/p/2o2BaAM)Tool in place (https://flic.kr/p/2o2BaAM) by Macabe Thiele (https://www.flickr.com/photos/187487200@N03/), on Flickr
Title: Re: Cb550 F2 Horn Mounting
Post by: bbrian66 on March 29, 2026, 07:37:12 PM
Thank you both! This is hugely helpful. Im glad I liked into this before going much further!