99 wr400 pink wire

I've searched and searched. I know this bike is old and most who did this mod don't even have their wr anymore. I'm adding a regulator rectifier. I need that second yellow wire and I know to clip the grounded bare copper wire. But can I clip that pink wire and use it? I've read that yz's need that wire clipped and grounded. But it's two different cdi's. Can anyone offer some guidance? Mike

Does anyone know what the pink wire on a wr400 actually does? It's not clear on the diagrams.

Can I just throw a yz426 cdi in my bike? I've got one on my bench.

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