Honda-SOHC
SOHC.co.uk Forums => The Black Bomber Board => Topic started by: mo goldie on October 28, 2023, 12:17:37 AM
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Hi Guy`s
very new to the black Bomber and new to here so be gentle.
I have just got a 1967 bomber and been trying to fix as many problems as I can, one being the ign to change this out for electronic ign so went for the "Shockwave" Electronic Ignition from COMMON MOTOR COLLECTIVE as i am in the UK I have to wait for it to get here, but they say to change the rectifier as it could damage there system..... they also say to make sure the coils have coils a minimum resistance of 3.5 ohms. but don't know how to test them to see that but they are a new set on the bike..... but the thing is I need to take out the old rectifier and don't know how to wire in the new....its this one if you can see it ?
https://www.ebay.co.uk/itm/314005383176
do anyone know which wire go`s where please ...... as I say I am new to here and the Black bomber so keep it easy lol
Cheers Mo
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Have you tried the link on the Common Motor Collective site at a glance it appears to cover the wiring of the combined unit in some detail?
Have you checked the coils for any markings if they are branded you might be able to obtain the coil specs from the manufacturer?
https://support.common-motor.com/hc/en-us/articles/360020830392-Installing-Your-Regulator-Rectifier-Combo-Unit
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This chap is the one you want by to go to he has everything.
Email him with what you need and they’ll mail you back super quick. Used him 4 times and every time, second to none.
https://ricksmotorsportelectrics.com/?gclid=CjwKCAjwv-2pBhB-EiwAtsQZFM818XLdfYwFkXI3XMaA1Pt1oT2dQYQQd2pw3AOCkOFbNwdexnIkghoCE90QAvD_BwE
Sent from my iPhone using Tapatalk
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Yellow to Yellow (AC)
Brown to Pink (AC)
Red/White To Red (positive output)
Green to Green (Ground)
That's old wiring colours to new rectifier colours
The original rectifier was selenium and you are changing to silicon which is much more reliable and does not deteriorate with age, Most 50 + year old seleniums are very leaky and will discharge battery when the engine is off. That's if they work at all.
Later 450's and CB250/350K's etc had a voltage clamp unit to prevent over-voltage/over charging by dumping excess charge to ground., I can explain how to fit one if you are interested. There are tons of used ones around .
Manuals here in my Dropbox links if you don't have already.
CB450 DOHC
HONDA CB450K0 Black Bomber Shop Manual
https://www.dropbox.com/s/typ5a2r2mjaxtvs/CB450%20K0%20BLACK%20BOMBER%20SHOP%20MANUAL%20.pdf?dl=0
CB450 DOHC Shop Manual 1968 5-Speed
https://www.dropbox.com/s/stqw7jm89xtt1rz/CB450%20Factory%20Service%20Manual%20.pdf?dl=0
CB450 K0 Black Bomber Parts Manual
https://www.dropbox.com/s/jj3kxdzg2k8rklb/Honda%20CB450%20K0%20Parts%20List%20Manual.pdf?dl=0
CB450K0 CB450P Late Parts Manual
https://www.dropbox.com/s/mmtjjpjy4gydrre/CB450%20CB450P%20PARTS%20MANUAL%20ED4%20%28flattened%29%28Searchable%29.pdf?dl=0
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Wow Ash your depth & width of knowledge is brilliant.👍👍👍
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well thanks for all the comments and help as I will have to look at all what you have said.... I cant remember seeing a red wire coming out of that rectifier tho... I did see a brown and a yellow I think but the wires being that age has changed colour over the years but will check that red out, Oh I did check out the guy brenden and looked at his Video but they just said about unplug and re plug but the black Bomber dont have a plug cumming out of the rectifier just 3 wires out of the wiring harness going to the 3 round screwed terminals on the rectifier. any other help guy`s gratefully Received.
Thanks Again
Mo
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Attached is the wiring diagram and a picture of a NOS original selenium rectifier. You can just make out the colours. The centre terminal is the positive output (connect to red on your new rectifier) The stud of the original rectifier connects to the chassis (negative) and so you need to connect the GREEN wire of your new rectifier to the chassis of the bike ..... there was probably an eyelet connector with a green wire to do this on the original loom, which connected to the stud of the selenium rectifier.
[attachimg=1]
[attachimg=2].
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Hi guy`s
Well Ashimotoko you have solved the problem's so I just got a better better one to work with on the bike this one
https://www.ebay.co.uk/itm/123754925999
so as you say the Red on the new one go`s to the centre one what was on the Selenium rectifier ...... and the yellow on the old one to the yellow on the New one........... the Green on the new one go`s to Grund ( earth ) .............. and the brown on the old one go`s to the pink on the new one.
I hope that is all right what I have said ?
Cheers for all your help Mo
Ps can`t wait to fit the new Electronic Ign when it gets here too...... Just hope it don`t Go like my BSA did ;D
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I have never tried one of those combined units. They basically do what the original rectifier and the voltage rectifier did on later bikes. Not sure on the quality of the Chinese made ones though. Perhaps someone else on here has experience of using one on Honda twin model.