SOHC.co.uk Forums > CB500/550
Any idea what this is?
beardylondon:
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?
--- Quote from: deltarider 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...
--- End quote ---
Nurse Julie:
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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beardylondon:
Thanks Julie, so I guess this is something I should do if Honda suggested it back then?
Nurse Julie:
--- Quote from: beardylondon 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?
--- End quote ---
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.
beardylondon:
OK, fair enough thanks!
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