Honda-SOHC

SOHC.co.uk Forums => CB500/550 => Topic started by: Trigger on May 17, 2014, 05:31:03 PM

Title: Alternator problem (maybe)
Post by: Trigger on May 17, 2014, 05:31:03 PM

I have the 500K not charging. Now on a three phase system you check between the yellow wires for a reading. Everything seems fine. So i checked between the white and green, ok. But i have a signal between all wires and ground. I know on modern bikes this is a problem but, is it a problem on these old girls??? 

Title: Re: Alternator problem (maybe)
Post by: AshimotoK0 on May 17, 2014, 07:27:22 PM

Is it a 500/4 k, if so  ,there, should not be any resistance between any of the yellow wires and ground. If there is it is usually  due to breakdown of insulation of the laquered 'magnet' copper wire. I had 2 400/4 stators fail in this mode, back in the day. I think it's because they don't run in oil like the twins/CB750 and you can get corrosion of the laminated steel part.

Cheers .... AshD

Title: Re: Alternator problem (maybe)
Post by: Trigger on May 17, 2014, 07:38:42 PM

Cheers Ash, just wanted to double check.

Title: Re: Alternator problem (maybe)
Post by: Bryanj on May 17, 2014, 11:35:04 PM

On the US site I put up an e Honda document explaining the 3 phase charging circuit PM me your emaail addy again (I don't keep them!) and i will send you a jpeg copy

Title: Re: Alternator problem (maybe)
Post by: AshimotoK0 on May 18, 2014, 08:44:15 AM

Quote from: Bryanj link=topic=6619.msg36312#msg3631
2 date=1400366104

On the US site I put up an e Honda document explaining the 3 phase charging circuit PM me your emaail addy again (I don't keep them!) and i will send you a jpeg copy

It's a brilliant design Bryan, as it does not use brushes for the field like car versions of the time. OK it has an electromagnetic voltage reg. but hey it was probably designed in 1968.

Cheers ...  AshD