Home » General » Workshop » CD125S black wire needs to go somewhere (Wiring issue to resolve)
CD125S black wire needs to go somewhere [message #300793] Mon, 27 May 2019 21:14 Go to next message
Barrie is currently offline  Barrie   South Africa
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Registered: May 2019
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(1) Club Racer
Hi Guys,

Recently acquired a very cool project - a 1970's era CD125S which has a black wire just dangling from next to the HT coil that surely needs to go somewhere. Any ideas anyone? There isn't a spark at present and thought maybe this could be the problem child.

I've attached a picture - this from under the fuel tank. Thank you in advance for any assistance provided
Re: CD125S black wire needs to go somewhere [message #300794 is a reply to message #300793] Tue, 28 May 2019 07:13 Go to previous messageGo to next message
spagiratwink is currently offline  spagiratwink   United Kingdom
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Registered: January 2016
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(6) Moto1 GP Racer
/forum/index.php?t=getfile&id=22433&private=0Hi , check this small circuit to the Emergency switch, if the 2 other wires are your condenser and contact Breaker and this one is a Black one, also do you need the workshop manual
Re: CD125S black wire needs to go somewhere [message #300795 is a reply to message #300793] Tue, 28 May 2019 10:18 Go to previous message
Kakugo is currently offline  Kakugo   Italy
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Registered: August 2003
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(18) Geoff Duke
I am not familiar with the CD125S: I suspect it's based around the 70's CB125/CL125, right? think

Those small 70's Honda ignition coils had two wires coming out of it, usually one black and one blue: blue one went to the contact breaker and black one to the stop switch. On smaller models, and I am going by memory here so take this at face value, the ignition connected to the stop switch on the main wiring harness somewhere near the horn connection.

It's likely you are not getting spark because the points have have worn out and/or the condenser has rusted. While parts are available for those old Nippondenso/Daiichi ignition systems, consider upgrading the bike to an electronic ignition. Cheap, maintenance free and far more reliable.
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