SOHC.co.uk Forums > CB350/400

Electrical charging question.

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Oddjob:
I'd advise doing a really simple test first.

Get a screwdriver, turn on the ignition and put the screwdriver against the rotor badge area, if it gets pulled onto the badge then the field coil is working, if it doesn't then it isn't. Most failures these days seem to be field coil related, either it's buggered but more often the 2 spade connectors are corroded and failing to make a good contact. The field coil becomes a big magnet when the ignition is on, no magnetism, no charge.

It's a quick and very easy test and should always IMO be the first test you do when suspecting a charging problem, mainly because it requires almost no tools and it's so easy to do.

Carbs PD or the more normal 550 carbs? PD carbs are harder to balance in my experience as they have one which isn't adjustable, be thankful it isn't a GL1000/1100, those are impossible to balance until you know the knack.

McCabe-Thiele (Ted):
Good tip Ken, I'll save that one for future use.

I've read something about lithium batteries being sensitive to over voltage thus shortening their life?

K2-K6:
I'd see the fixed "reference" carb as an assest which prevents arbitrary setting of all slides to inappropriate overall positioning relative to the throttle operating mech.

In essence, it prevents a distortion of slide to operating mech by having that single one fixed. Just means that you only have to match the other three to that one.

It's a method used on some car twin carb setup too. Stops people wandering off track to get everything completely out of synch, not with each other but intended installation of overall throttle "system" etc.

K2-K6:

--- Quote from: ComfySofa on March 02, 2025, 03:10:40 PM ---Cheers - thanks for that. Well, its a whole new electrical system - the Reg/Rec is specifically for Lithium batteries. Ill make a start on cleaning and checking connections....as i say it seems to be steady at 12.6/7 volts....

--- End quote ---

Original spec (albeit for 750 system) is regulator to cut @ 14.5v with most common system being similar.  Most of the cars and bikes I check are similar at approx 13.9 to 14.7v generally. 

Didn't think lithium was ordinarily targeting less than that.

Is there data for target output of lithium system  you've used?

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