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Topics - SteveD CB500K0

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Misc / Open / Site Stats 2007-2020
« on: January 01, 2021, 12:21:59 PM »
My annual update for site usage:

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Humour / We’re OK here …
« on: November 26, 2020, 01:42:02 PM »

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Humour / Cut-out-and-keep Stress Reduction Kit
« on: October 08, 2020, 03:27:15 PM »

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Charging System Checking on SOHC4s

All of our bikes are now getting old and electrical problems are the most common problem encountered.

This is, I hope, meant to be a relatively easy way to test and diagnose which element is likely to be faulty.

Firstly let me say since starting work at a dealer in 1974(ish) I have NEVER seen an electrically faulty field coil or stator; I have seen them physically damaged by traffic accident or being dropped. Whilst doing all tests at connectors check for melting plastic, burning, blackening or loose fit.

Testing equipment required is a multimeter that can read both AC and DC volts plus resistance. You will also need a fully charged battery installed correctly.

OK start by turning off the kill switch and disconnecting the headlamp and tail light, especially on US models where lights come on with ignition. Also disconnect the 3 wires at the voltage regulator.

Set multimeter to DC volts scale of 20
Firmly connect the  red lead to +ve post on the battery and then use the black lead to check and note battery voltage at –ve post; move the black lead to the engine end of ground lead and re-check the voltage If there is any variation, the ground lead needs cleaning/tightening/replacing.

Now firmly connect the black lead to the battery –ve and using the red lead, check and compare the voltage at the solenoid connection, then the main fuse in, main fuse out and the red wire at the ignition switch.

If at any one point the voltage falls by more than a fraction of a volt there is a bad wire or connection between the point being tested and previous test point and this needs to be rectified.

Turn the ignition switch on and check the voltage at the black wire (switched 12V). Again there should ideally be NO voltage drop (a small fraction is permissible). Go to the black connectors in the headlamp shell and finally to the black wire at voltage regulator.

The MAXIMUM voltage drop between battery and regulator should be less than 0.5V (preferably less).

Connect just the black wire to the regulator and measure the voltage at the white connector on the regulator, reconnect the white wire to the regulator and check the voltage at the white field connector just outside generator case.

Reconnect all wires disconnected to test voltages but not the lights.

The next test gets a bit more difficult as you need to disconnect the block connector that goes to the generator but re connect the green and white wires that go to the field coil; this also means that the oil and neutral light won’t work. On the 750 you can disconnect the wires just outside the generator cover and leave the block connector alone.

Remove your multimeter from battery and reset to AC volts of about 100.

Start the engine then if you look at the block connector from generator there are 3 yellow wires which gives 3 “pairs” (Imagine wires labelled 1, 2 and 3 that makes 1-2, 1-3 & 2-3)

Test the AC voltage across the 3 pairs of wires. This should read between 15 and 60 depending on revs.

There is a testing procedure in the Manual for rectifiers but you could say that if you have done all the tests above and get the ac voltage above but no charge at battery the rectifier or it’s wiring is suspect

Bryan Jones May 2020

CB500/550 / Battery charging without removing side panel
« on: April 11, 2020, 11:45:48 AM »
Lazy I know but Menno’s exquisite sidepanel will not come off with the normal amount of force.  Probably down to the new rubbers.

I can’t reach the positive terminal to charge the battery.

Where else could I connect it that’s accessible in a crowded garage.

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Misc / Open / The Covid Thread
« on: March 23, 2020, 06:47:17 AM »
As we move inexorably towards lockdown here in the UK (some of you in other countries may already be locked down), I thought we should have a general chat thread.

We’re not Facebook so can’t do instant messaging or chat (other social media products are available) but I look forwards to reading all your posts every day and would hate to see the volume drop as we all hunker down.

So, jokes, pictures, notes, thanks welcome.

Anything goes (except blatant politics please)

Keep safe.


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Humour / At the Gym
« on: March 15, 2020, 08:55:17 PM »

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Misc / Open / Poor old Pam (sadiassa)
« on: February 13, 2020, 05:16:43 PM »
I’ve no idea how this spammer managed to register as I have it set to manual approval and I certainly never approved anyone today.

A bit worrying that.

Anyhow, they are in the bin. Unfortunately James’ post about the 24,000mg ketamine tablet (shaped like an apple) is also in the bin

Beverley (my wife) laughed out loud at that - and there’s not much on here that she finds interesting (or amusing)

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Misc / Open / Pictures not showing on Tapatalk
« on: January 06, 2020, 12:40:00 PM »
This is a bit more complicated than I thought at first...

Anyone seeing this problm please report back here with the version of iOS or Android that they are using.

Me: iOS 13.3

Misc / Open / Toy Runs?
« on: December 08, 2019, 03:12:33 PM »
Just got back from the Reading Toy Run. A good turnout of about 1500 bikes. One blue 750, two Kettles, a KZ1300 and loads of 1960s scooters with mirrors and blue smoke. Love that smell!

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Announcements / Changing your displayed name on the forum
« on: November 24, 2019, 09:15:56 AM »
One of the things that have been fixed on this forum from the beginning (2007) is that the users are not allowed to edit their displayed username (not their actual username - just what shows on the posts)

This always caused mayhem on the US site as some people would change their name every other day - some to political slogans etc.

Sorry that it has taken 12 years to trust you lot...

I ran the forum for my local IAM advanced motorcyclist group for many years ( and still run the website. There I decided that members could only use their real names. I'm sure it contributed to a much more polite discourse.


Go to "Profile" on the menu
Select "Account Settings"
Edit your displayed name

Please don't let me down here :)


PS: Having met quite a few of you, it would be nice to see a few real names - it's hard enough to remember sometimes!

Announcements / Email notifications
« on: October 17, 2019, 09:42:11 AM »
Hi all.

I've just had a note from my hosting company that the server has sent 77 emails in a very short time (and they suspect I have been hacked)

It seems that these are all new post notification emails which for some reason have been queued and all sent at once!

They have suspended my outgoing emails as a protection against their server being black flagged as a spam source.

I've told them the emails are OK and asked them to reinstate the service. In the meantime you may not receive your normal notifications. Sorry.

It also means that the new members won't get their welcome/password email :(


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