Author Topic: Any idea what this is?  (Read 3950 times)

Offline beardylondon

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Re: Any idea what this is?
« Reply #15 on: November 22, 2021, 06:09:04 PM »
Here are some photos, I know it is painted the wrong colour, it was like it when I bought it!





1976 CB550 K2 (USA import)

Offline deltarider

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Re: Any idea what this is?
« Reply #16 on: November 22, 2021, 08:21:49 PM »
Oddjob got it. Unfortunately I cannot consult the Parts List CB550, CB550K1, CB550K2 right now, because the Honda4Fun site has been down for weeks now, but if you go to p.170 of the Shop Manual Honda CB500-550, you'll find the specifics of the CB550K2 or K76 as it is also named. It's about the rerouting of the breather tube. It has puzzled me for years because as far as I know the K2 was for the US only and they had the breather tube connected to the airfilter case. So the bracket has no use, unless... the K2 was also destined for other countries (Asia? Japan itself?) that are not documented in the sources we have.   

Offline beardylondon

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Re: Any idea what this is?
« Reply #17 on: November 22, 2021, 08:57:01 PM »
So it’s basically pointless on my bike?
1976 CB550 K2 (USA import)

Offline deltarider

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Re: Any idea what this is?
« Reply #18 on: November 22, 2021, 09:13:11 PM »
Well... if it was my bike, the first thing I'd do, is to undo that blow-by gas route and reroute as is shown in p.170. Recently on the German forum an owner had connected the breather to the air filter case, but was alarmed by how quick the air filter element got wettened/fouled. When the CB550F2 was tested in Germany, Das Motorrad (which is the best motor mag in the world IMO) had also noticed that connection could be problematic. At the time, they have cured it by having the oil no higher on the dipstick than halfway the upper and lower mark. Your choice, but keep an eye on the airfilter element if you choose to maintain the blow-by gas route to the air filter case. I've seen quite a few CB550K3s that had that typical soft (wettened) spot in the airfilter element...

Offline beardylondon

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Re: Any idea what this is?
« Reply #19 on: November 22, 2021, 09:44:34 PM »
I’ve got no idea what you are on about! Also I don’t have the workshop manual, so page 170 is meaningless to me. I’ll just carry on and hope for the best!  ;D
1976 CB550 K2 (USA import)

Offline Bryanj

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Re: Any idea what this is?
« Reply #20 on: November 22, 2021, 11:48:44 PM »
The manual is in alladins cave and can be downloaded

Offline deltarider

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Re: Any idea what this is?
« Reply #21 on: November 23, 2021, 10:29:20 AM »
My model, the CB500K2 GENERAL EXPORT, which has many parts in common with the CB550K2, also has one, be it with a different partnumber: https://www.cmsnl.com/products/guidebreather_90514323610/
It is exclusively for the CB500K2 GENERAL EXPORT and the 90514-374-700 is exclusively for the CB550K2. Both parts are named: GUIDE BREATHER. Note that it is unusual that another guide, the WASHER, BATTERY BREATHER GUIDE has the identical first number 90514: 90514-323-000

Offline beardylondon

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Re: Any idea what this is?
« Reply #22 on: November 23, 2021, 11:12:33 AM »
Many thanks!

The manual is in alladins cave and can be downloaded
1976 CB550 K2 (USA import)

Offline beardylondon

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Re: Any idea what this is?
« Reply #23 on: November 23, 2021, 11:15:36 AM »
Interesting, do you have a breather pipe connected?

Many thanks!

The manual is in alladins cave and can be downloaded
1976 CB550 K2 (USA import)

Offline Nurse Julie

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Re: Any idea what this is?
« Reply #24 on: November 25, 2021, 12:41:28 PM »
Was looking for something totally unrelated this morning and found this in an old parts bin. No idea where it came from as never had a 500/4 that late. It could have came in a load of assorted used parts bundles we bought. I'm sure it's the same part but yours looks bent 🤔🤔🤔

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Offline beardylondon

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Re: Any idea what this is?
« Reply #25 on: November 25, 2021, 02:34:56 PM »
So you mean this:

http://manuals.sohc4.net/cb500/service_manual/HSM500550_15.pdf

My question is, what exactly do you mean by "undo that blow-by gas route", sorry I am unfamiliar with this term.

If I follow page 170, what size and type of breather pipe should I be using?

Well... if it was my bike, the first thing I'd do, is to undo that blow-by gas route and reroute as is shown in p.170. Recently on the German forum an owner had connected the breather to the air filter case, but was alarmed by how quick the air filter element got wettened/fouled. When the CB550F2 was tested in Germany, Das Motorrad (which is the best motor mag in the world IMO) had also noticed that connection could be problematic. At the time, they have cured it by having the oil no higher on the dipstick than halfway the upper and lower mark. Your choice, but keep an eye on the airfilter element if you choose to maintain the blow-by gas route to the air filter case. I've seen quite a few CB550K3s that had that typical soft (wettened) spot in the airfilter element...
1976 CB550 K2 (USA import)

Offline Nurse Julie

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Re: Any idea what this is?
« Reply #26 on: November 25, 2021, 02:45:53 PM »
This pic shows a blow by gas circulation. This is on a 400/4 but the theory is the same. The gases are re cycled instead of just being dumped.

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« Last Edit: November 25, 2021, 02:48:12 PM by Nurse Julie »
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Offline beardylondon

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Re: Any idea what this is?
« Reply #27 on: November 25, 2021, 02:59:38 PM »
Thanks Julie, so I guess this is something I should do if Honda suggested it back then?
1976 CB550 K2 (USA import)

Offline Nurse Julie

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Re: Any idea what this is?
« Reply #28 on: November 25, 2021, 03:05:03 PM »
Thanks Julie, so I guess this is something I should do if Honda suggested it back then?
I personally have never had any issues whatsoever with keeping the system just as Mr Honda intended.
They only advised re routing the atmosphere end of the breather anyway. That's obviously why that clip thingy is fitted to your model, just to hold the breather tube there, instead of its previous place. It only shows it being done on the 550 though for 1 year, which is mighty strange.
« Last Edit: November 25, 2021, 03:13:24 PM by Nurse Julie »
LINK TO MY EBAY PAGE. As many of you know already, I give 10% discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline beardylondon

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Re: Any idea what this is?
« Reply #29 on: November 25, 2021, 03:12:43 PM »
OK, fair enough thanks!
1976 CB550 K2 (USA import)

 

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