SOHC.co.uk Forums > CB350/400

Oil warning light

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Nurse Julie:

--- Quote from: Athame57 on April 09, 2025, 09:22:04 PM ---
--- Quote from: Bryanj on April 09, 2025, 06:09:43 PM ---The sender units have been known to fail on 350/400/500/550 which i think are all the same unit, idealy fit a pressure gauge temporarily or replace the unit, i think Julie does a better priced one than Honda dealers

--- End quote ---
Where do I find that on the bike?

--- End quote ---
It looks like this George and is on top of the top crank case. But, if you only changed the oil and filter last week, I would be double checking the filter spring, spring seat washer and pressure relief valve. It could just be a coincidence but worth checking everything is where it should be.

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Athame57:
Thanks for this Julie. I havn't managed to spot it on the CMSL diagram which is a brand new platform, looks like there it less on it. I see it is the oil pressure switch ( sender?) is it a crank splitting job to replace if indeed here is a problem with it?

Athame57:
That's it were I've circled yes? Looks less of a worry, if this happens anymore I'm getting a new one.

Nurse Julie:

--- Quote from: Athame57 on April 09, 2025, 10:01:16 PM ---That's it were I've circled yes? Looks less of a worry, if this happens anymore I'm getting a new one.

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Yes, that's it George.

exvalvesetdabbler:
Another possibility is the wire from the oil light bulb down to the pressure switch getting grounded somewhere between the two,  most likely inside the headlamp shell if the sleeve on a bullet connector is not in place or damaged and its touching the headlight unit or the chrome rim. More so if vibration or pot holes is introducing the fault.  As well as what others have mentioned, what else has changed or been messed with since it last behaved itself. If I remember right it's just a bare wire termination to the switch which if stripped back too much could ground out if it's bent over.

If my bike hasn't run for a a while , I always kick it over with the run switch off until I see the oil light flicker off/on with each kick a few times just for piece of mind that the oil switch isn't sticky and the oil starting to move.  Doesn't need much pressure to turn the oil light off.

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Regards
Dave.

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