SOHC.co.uk Forums > CB500/550
Any idea what this is?
beardylondon:
Yeah, it’s just for fun, so I won’t worry! Thanks.
deltarider:
A quick look at Fig. K2-1. p.170 of the Shop Manual Honda CB500-550 shows it is the crankcase breather tube.
When testing the CB550F2, which has a similar recirc. system, the German magazine Das Motorrad found out that the airfilter element did indeed got fouled by the recirc. system and that this robbed performance.
When it is about things that can be missed, that recirc. system is certainly what one can do without.
BTW, does any of you know why the site www.honda4fun.com is down? I've tried to contact them, but the two persons I know there, have an email adress ending in @honda4fun.com, so messages do not arrive.
I miss the site dearly; they have the most complete collection of documents. Moreover they are the only site - at least that I know - that offers the Parts List CB550, CB550K1, CB550K2. It is a brilliant part list as all three models' columns are right next to each other, so one can see in one glance, what has changed from one model to the other. Too bad I never downloaded it. But maybe any of you knows another source.
Beardylondon, if you have an Owner's Manual of your K2 (AKA K76), the international SOHC Four community would be very grateful, if you'd do the effort to scan and upload it to a site of your desire. It is one of the few manuals that is still missing. It looks like... [see below].
beardylondon:
Thanks, no alas I don't have the owners manual.
Nurse Julie:
I do agree with you Delta, the drawing on page 170 does appear to suggest it is the main engine breather tube they are talking about. But.... Firstly the main breather tube is not long enough to reach down below the footpeg and knowing how innacurate some of Hondas drawings (and other Manufacturers) are, I'm wondering if the top tube shown in that drawing is the engine breather tube, then the person drawing the picture saw a tube coming out from under the side panel and down to the clip and did the drawing assuming this. I think the top breather tube in the drawing is correct and the tube showing coming out from under the side panel, is the drain tube that goes to atmosphere. I wonder if it had been reported to Honda that oil vapour coming out of the drain tube had blown onto someone's back tyre and caused an issue. The drain tube usually goes down behind the swing arm pivot and is in direct line with the tyre. By re routing the drain tube to come out of the side and through the clip would avoid this? Also, it appears it was only done for 1 year, why didn't Honda carry on with this re routing on the 550 F1/F2 models 🤔🤔🤔
deltarider:
That's very plausible, Julie. The bracket was then meant to accomodate DRAIN TUBE ASSY, 17358-341-000, a drain tube the CB550K2 shared with the later models K3 and K4 and that differed from the one on predecessors CB550(K0) and K1, which had 17358-374-000.
Then not only the drawing in Fig. K2-1, p.170 is incorrect, but the tube also has been misnamed BREATHER TUBE where in fact it is about a drain tube.
That would make sense.
cf: https://www.cmsnl.com/honda-cb550-k2-four-1976-usa_model464/partslist/F++05.html
Question for me remains, what is that bracket 90514-323-610 doing on the CB500K2 GENERAL EXPORT model, that has no drain tube at all, that is: not from the bottom of the airfilter case? https://www.cmsnl.com/products/guidebreather_90514323610/
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