SOHC.co.uk Forums > CB500/550
stator overheating
Brian Cairns:
Cheers,
I'll have a look.
Thanks
Brian
AshimotoK0:
This is a good info Honda Bulletin on the early Honda-4 3-phase charging system. Pretty clever in that it doesn't use slip rings and modulates the magnetism in the rotor, by adjusting the field coil current to suit the charging/power delivery. As said by others, any aftermarket solid-state system, which doesn't replicate that mode of operation is to be avoided IMHO.
Honda's 3-phase charging Service Bulletin.
https://www.dropbox.com/s/2oqrx5cvv7byqao/3-phase%20Honda%20Charging.pdf?dl=0
Brian Cairns:
Thanks ,
Auto spark coming today, still have old rec/reg so will get spark to look at it .
Cheers
Brian
Oddjob:
I'd be interested to know your reasoning behind saying that aftermarket solid state combined reg/rec don't do exactly the same job as the old separate reg and rec.
From what I've read the Mosfet type units switch between the 3 modes much faster than the old Honda equipment, there is no chance of a point face burning and sticking for instance, so are more reliable. Manufacturers know exactly how the Honda system works, as the bulletin says it's like other automotive systems employed by other contemporary vehicles and they've been using electronic systems in those for many many years.
AshimotoK0:
--- Quote from: Oddjob on September 01, 2023, 01:40:52 PM ---I'd be interested to know your reasoning behind saying that aftermarket solid state combined reg/rec don't do exactly the same job as the old separate reg and rec.
From what I've read the Mosfet type units switch between the 3 modes much faster than the old Honda equipment, there is no chance of a point face burning and sticking for instance, so are more reliable. Manufacturers know exactly how the Honda system works, as the bulletin says it's like other automotive systems employed by other contemporary vehicles and they've been using electronic systems in those for many many years.
--- End quote ---
Not sure Ken .. Never owned or used an aftermarket one and not sure how they operate ... always stuck with original electro-mechanical type myself. Comparing the Honda system with automotive alternators of the same era, then they had slip rings and carbon brushes which fed the field current into the field coil ... but yea they would have electronics in them too. I would imagine that the Genuine Honda (Hitachi etc). combined reg/rectifier units, as used on later bikes, would replicate the electromechanical system though and hence be OK. It's someone else who suggested that some aftermarket units use 'current dumping' ... as Honda did on the twins with single phase night/day coils on their stators but not really ideal for the 3-phase system models.
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