SOHC.co.uk Forums > CB350/400

Car type oil filter on 400/4 ???

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AshimotoK0:
Thanks Nigel... I reckon it's something like this

https://www.oldbikebarn.com/honda-cb350f-400f-500-chrome-spin-on-oil-filter.html

Discussion here also:-

http://forums.sohc4.net/index.php?topic=108562.0

AshimotoK0:
Here are the pics of the blocked off port.

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Nurse Julie:
I could be talking out of my backside here but, I'm sure that only 1 hole is patent on my CB400/4. I'm trying to find a good pic in my photos to show it but can't find one.

Nurse Julie:
Yes, one hole is plugged as standard as photo. Just looked at a CB500/4 one as well and that only has only one hole patent also

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K2-K6:
I'm not familiar enough with the 400 engine to say that it's normal just from that picture,  you need another to compare as Julie says.

But my read of it is that it's the manufacturing process that needs to go through there to connect an internal gallery to the filter output route into the engine.

Looks like they've machined then plugged it to get in there that way. 

If left open,  it would just allow the oil to bypass the filter route on it way to the internal galleries. 

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