SOHC.co.uk Forums > CB350/400

Oil in my air filter

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Oddjob:
Nope, perfectly fine to do it. Most of the early SOHC models vented to atmosphere.

Trigger:
If that is oil staining, it shows that you have a problem from the vent system ;)

Athame57:

--- Quote from: Trigger on August 16, 2023, 08:59:42 PM ---If that is oil staining, it shows that you have a problem from the vent system ;)

--- End quote ---
I think I shall give up with it, stuff net zero, ULEZ and Sadiq Khan! I used to think the thing mattered but it doesn't seem so.

Trigger:

--- Quote from: Athame57 on August 16, 2023, 10:26:48 PM ---
--- Quote from: Trigger on August 16, 2023, 08:59:42 PM ---If that is oil staining, it shows that you have a problem from the vent system ;)

--- End quote ---
I think I shall give up with it, stuff net zero, ULEZ and Sadiq Khan! I used to think the thing mattered but it doesn't seem so.

--- End quote ---

It is showing a problem that needs addressing. If you bypass, you are ignoring the problem that could get worse  ;) 

McCabe-Thiele (Ted):
Out of interest what is the condition of the inside of your vent pipe itself not just the long section but the drain section as well,  it might look good on the outside, it could   be well deteriorated internally.

This can lead to high resistance of air flow with a pressure build up squirting out oil that has collected on the walls of the pipe work.

Might be worth removing the top vent cover to put your mind at rest over any excess venting. Just my thoughts it's often not something serious but something simple. Too easy to think the worst.

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