grey wire mod?

what is this grey wire mod I keep reading of?

On the WR 250/400/426 it inhibits the ignition timing to meet sound tests, or something like that.

Apparently, on totally stock bikes, the improvement is impressive. Others who modded their bikes weren't so sure.

I do not know if this even pertains to your 125. Don't go cutting wires if you do not know what two compents they connect!

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