Honda-SOHC
SOHC.co.uk Forums => CB350/400 => Topic started by: smoothoperator on April 21, 2022, 07:33:17 PM
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Bike not charging so I have been reading through the posts on the issues. Regulator seemed a good place to start. The upper contacts were badly pitted so I cleaned them up with 800 grit, as well as the two lower contacts. Put it back on with no improvement. Next I looked at cleaning two connectors from the alternator, the white and the green - maybe striped I can't recall. All the yellows looked good so I left them alone. Started up and now charging OK by testing the voltage across the battery. I then disconnected the battery with the engine running and it kept going, which gave further reassurance.
Here's the but... Sorry it is a bit long winded
I've included photos which should help. Basically, the post that holds the contacts is adjustable, I removed it to get better access to the contacts for cleaning, then noticed the retaining screw goes through a slotted hole, allowing for up and down movement. Securing it in the upper position means more force is needed to pull the upper contact down and therefore a higher voltage? My question is, is there an optimum height to set this post.
I fitted the regulator to the bike with the cover off so I could see it in action. When the ignition is turned on, the electromagnet pulled the contact down, this is one of the clicks you commonly hear when turning the key. When I started the bike, the contact moved up, into the charging position and the voltage increased across the battery. After stopping the engine and waiting a minute or so, then turning the ignition on, the contact didn't move down this time, presumably because the voltage was now a bit lower. Started the engine and charging commenced straight away. I'm concerned with the post height where it is, it could be overcharging.
https://photos.app.goo.gl/371c31D4Nqcc2iQx8
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My Cycleserve 400 service book has some detailed information on the Regulator. I will scan you the pages in the morning and e mail them to you Steve.
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There is a set up/testing procedure in the Honda manualBUT it needs to be done at the correct temp and load