Honda-SOHC
SOHC.co.uk Forums => CB350/400 => Topic started by: Mikep328 on September 11, 2023, 06:16:38 AM
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Sounds useful if the 400 shares the same electrical system
https://support.common-motor.com/hc/en-us/articles/360038003951-The-White-Yellow-Wire-Stator-Coil-Mod-How-To-Increase-Charging-System-Output-CB175-CB350-CB360-CB450
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Most definitely not ! Only for single phase Honda's with day/night charging stator coil type alternators.
I don't think that article is strictly correct anyway because when the bikes were new, the daytime coil was perfectly capable of supplying the charge but 50-> 60 years later the permanent magnets in the rotor have lost a fair amount of magnetism. The single phase system uses 'current-dumping' of excess charge into the shunt type regulator fitted to the later Honda twins. For bikes without the regulator (i.e Black Bomber CB450K0 and CB72/77) if you connected the night time charge coil permanently, you would have fried the battery. But for a 50+ year stator the reduced magnetism means you would need to connect the night time coil to maintain a constant positive charge into the battery, mindful that if it's a model without a regulator then best to fit one from a later model (i.e CB250/350K twin) or there may well be an aftermarket rectifier/regulator for the twin bikes.
On your 400F, the 3-phase system modulates the current into the battery in a more sophisticated way (i.e it adjusts the current in the field coil via the regulator to meet the electrical demand of the bike and has no permanent magnets in it) . This has been discussed in details many times on here.