SOHC.co.uk Forums > CB350/400
OOps, always worrying!
exvalvesetdabbler:
Ah ha. Looks like someone has relocated the OEM rectifier. That lump with fins looked like an aftermarket combined unit. I can see the original regulator in the most recent image.
The original rectifier on the 400 was on the other side
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Regards
Dave
McCabe-Thiele (Ted):
It might not be an issue, I thought the rectifier was mounted where it was originally to aid air flow/cooling.
Otis:
--- Quote from: exvalvesetdabbler on August 20, 2026, 09:42:59 PM ---Here is the original regulator, bolted to the air filter box. (Attachment Link)
Regards
Dave
--- End quote ---
OK, mystery solved.
I'm a bit confused about regulators, rectifiers and combined units but if the unit with the white strip containing green and black rectangles is the original regulator then that is what I have and the bolt fitted the upper fixing. It was concealed behind a part of the harness so I missed it. I must have started to remove this unit and then realised it didn't need to come out.
Anyway, thanks to all for the help and guidance which as always, is educational.
McCabe-Thiele (Ted):
--- Quote from: Otis on August 21, 2026, 10:19:12 AM ---
--- Quote from: exvalvesetdabbler on August 20, 2026, 09:42:59 PM ---Here is the original regulator, bolted to the air filter box. (Attachment Link)
Regards
Dave
--- End quote ---
OK, mystery solved.
I'm a bit confused about regulators, rectifiers and combined units but if the unit with the white strip containing green and black rectangles is the original regulator then that is what I have and the bolt fitted the upper fixing. It was concealed behind a part of the harness so I missed it. I must have started to remove this unit and then realised it didn't need to come out.
Anyway, thanks to all for the help and guidance which as always, is educational.
--- End quote ---
If a combined unit has been fitted, the one part replaces the original Rectifier and Regulator.
Yours has what looks like the original Regulator, it's held in place by the top and bottom bolts via rubber mounts fitted to the regulator.
The Rectifier is the unit with the alloy fins in your photo.
It might be worth checking if you have the lug on the right side of your frame where the original Rectifier is bolted in place by one bolt.
Seems unusual that yours is fitted where it is, makes me wonder if the wiring lead is too short to mount it in the correct place. Might be worth investigating a possible move to a cooler position on the right side of the frame.
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