CT70/Lifan Electrical??

CT70 Wiring to Lifan

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Keith Diederichs

New Member
Hey all, first time poster here, love the stuff I read already, and it seems there are a lot of experts here so I hope you can help. I am building/restoring a '72 CT70K1 and long story short, I have a Lifan SSR 125CC engine I bought off T-Bolt that I could not use in my original plans. I want to use the original harness so I can use all original accessories. To the issue.
This is what I have....

https://tboltusa.com/store/lifan-ssr-125cc-engine-br-sale-price-usa-only-p-1811.html

Unfortunately it came with no wiring diagrams. Three wires from the engine were easy and color matched three to the CDI/Coil, simple...

Green - Green
Black w/Red - Black w/Red
Blue w/White - Blue w/White

However, I have no wires to the original harness so its obviously not going to work. Here is what i have left....
From the Engine....
Yellow
White
Light Green w/Red

From the CDI/Coil
Blue w/White (another)
Two DIN connectors that have two wires each...
Green
Black w/White
I think one of these DINs is meant for a kill switch but not sure if that is the case or which one. I assume these would hook somewhere to the harness.

After hooking up everything else, the harness still has...
The CT70's original DIN from engine to harness with four wires....
Yellow and Green
Black and Green
Single Black (close to the DIN below, Rectifier and foot brake connector)
DIN w/ Red, Blue, and two Blacks (I believe the red and blue go to the battery but not sure).

Question: Of the remaining wires, where do they go, hook to, from engine to CDI to original harness? I attached pics to help with illustrating the issue. Thank you so much in advance for any help you can provide!
 

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Keith Diederichs

New Member
kirrbby, thanks for your response! To clarify the blue w/white from the engine is already hooked to the cdi, so I assume you mean the blue w/white from the CDI then goes to which black, in the harness DIN with two greens and yellow OR the lone black wire circled in 1.jpg?

The first link I have seen, the second link helps to identify the purpose of each wire from the engine (yellow and white for lights), so yes that helps.

Any other thoughts on what is left without a mate/home?
 
kirrbby

kirrbby

Well-Known Member
3 blue with white stripe wire ends there?? Are you sure? Blue and yellow maybe?

I think blue w white is for the trigger. Comes from the trigger on the stator plate and goes into the CDI. That's all. It tells the CDI when to make a spark, based on the position of the piston and valves/timing. The "spark" comes out of the CDI on a black wire and goes to the coil.

Black with white is usually for a kill switch...either in the ignition, or other kill switch, or both.
 
kirrbby

kirrbby

Well-Known Member
Yellow and white are both power lines for lighting. They would be like the red and green from your original engine. One powers the headlight circuit, the other charges the battery.
But...on some stators, one of those wires has to be grounded, and the other gets split to power both, the battery and headlight circuit.
 
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Keith Diederichs

New Member
So I must be missing something else since I don't have anything going to the wires in the harness DIN that went to the original engine OR to a single black wire in the harness I think went to the original coil. I read in another post that you had done something like this. Did you have one more harness? As far as the yellow and white from engine, I think you are right, both for lights so I assume if I only have yellow, the white is unused.... I saw a YouTube video someone did where they replaced the hardness with an aftermarket that lines right up with the Lifan, I think it was ordered from webllc, but I cant seem to find that on the Internet. Could it be possible the coil and cdi from Lifan is not designed to support all the accessories that the CT70 has and I need a different coil and CDI? I really wish these Chinese/Japanese parts had diagrams! Thank you for continued feedback, I have been racking my brain on this for over a week!
 
6

69ST

Well-Known Member
Okay...an outside-of-the-box idea...

Pull the flywheel and visually trace the leads back to the stator. That'll divide the wiring into: CDI pickup & trigger, CDI module (exciter, ground, kill lead), charging + lighting.

With those sorted by group you should be able to figure out individual leads by simple process of elimination. For example, there should be one AC lead for the HL circuit, one AC lead to the rectifier and a ground...that's the lighting + charging, done. Neutral light switch will be back above the countershaft. That leaves just the ignition...
 
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Keith Diederichs

New Member
Ill take a look. The more I think about this the more I am starting to feel like this coil and CDI cannot be used with the CT70, maybe for something like the Z50 that would have a just two lights and a kill switch; no horn, key/ignition, turn signals, or speedo, etc.....

Does anyone have a recommendation for a coil and CDI that would work with the Lifan 125CC and the original CT70 harness? If I could get a known working unit I could do some comparison to what I have and what is different....?

Continued thank you for all contributors, this site rocks!
 
kirrbby

kirrbby

Well-Known Member
Did you see post #6. Please double check the wire colors.

Trying to decipher what you have there. Your pics don't quite show us everything.

But I know tbolt has a good rep for parts support. They also have a ton of info on their website. Have you asked them for help.
I'll look for a how to, on their site.
 
K

Keith Diederichs

New Member
Yes, I saw and sorry for my ignorance. The three from the engine that match colors on the CDI are Black w/Red, Blue w/White, and Green. Remaining from the engine is Yellow and white, I think are lights, and light green w/Red which is neutral indicator as someone earlier posted. All I have left is one more blue w/White from the CDI, and the two black w/white and green dins that were earlier identified as kill switch. I have no wires to the harness at all, especially the dingle black I believe hooked to the black from the original coil. Hence my thought this CDI and coil are not right for the amount of stuff this bike has.....
 
K

Keith Diederichs

New Member
Thank you so much for all your replies. At the end of the day, if the black w/white and green dins are kills switches, I don't have enough wires. Im calling TBolt tomorrow to see if i even have the right parts. Thank you all so much for the help and I will post what they tell me in case it helps someone else. Thanks again!
 
D

Deoodles

Well-Known Member
I bought a 12v CDI from Beatrice a few years ago. I’m very happy with it. It was worth the work involved in setting it up.
 
K

Keith Diederichs

New Member
So apparently I am missing the voltage regulator so have ordered that. It seems no wires come from the engine to the original harness (its 6 volt), except yellow and white for lights (if 12 volt), instead they go to the voltage regulator, then from there to the harness. When I get the extra parts and take a look, Ill post my findings. Thanks for all the feedback thus far!
 
6

69ST

Well-Known Member
FYI, a "6v" coil will not work with CDI. Breaker point ignition requires different inductance/impedance values from the HT coil. Just source a CDI coil (which is usually a lot smaller) and be done with it.

As for the lighting & charging leads, there are only two...yellow & white. White feeds the rectifier. Yellow gets "T'd" at the other reg/rec input, with the other leg of the "T" going to feed the HL circuit. That leaves just battery (+) and a ground (-). Everything is grounded to the chassis.
 
K

Keith Diederichs

New Member
Thank you. Some of that is over my head, as is this project I believe! The coil and CDI are new, came with the Lifan so I think I am good on that. Thanks for the input, I may get this done after all.
 
6

69ST

Well-Known Member
Keith Diederichs said:
Thank you. Some of that is over my head, as is this project I believe! The coil and CDI are new, came with the Lifan so I think I am good on that. Thanks for the input, I may get this done after all.
Click to expand...

Maybe...but..."over one's head" doesn't mean the same thing every time. In the case of these electrical systems, the amount that truly is over your head isn't much. Yeah, I get it, it does SEEM overwhelming, at this time. But, it really is pretty basic stuff, less than you probably imagine.

I suggest approaching this one, single, lead at a time. Once you've identified the easier ones, like the lighting, charging & neutral light, there won't be many remaining. Figure out the grounds, both permanent and switched (kill switch function) and there shouldn't be more than 3 or 4 left to ID in the stator pigtail. Come up with a schematic that at least identifies your stator leads, to the CDI unit and you're well on your way; the next step is IDing the CDI module contacts, by position (there's usually 5 of the six that are used, with one left empty). Might not even be this much work; if you have the CDI module that directly plugs into the stator plug, on the engine, you likely only need to ID the switched ground and primary coil output-to-HT-coil input. Still, overwhelmed? I'd set a goal of identifying one lead per day...that'd still get you sorted in less than a week. IOW, the key to demystifying & de-stressing the electrical setup is to realize it's nothing more than working with a single lead at a time...until there are no more left to ID.
 
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