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That happens because of the way the Bonnie ignition is set up. The coil fires both plugs at the same time on each crank revolution, and because of that, one plug lead gets a bit more energy from the coil and thus runs very slightly hotter than the other. If you swap the plug leads, the gold header will catch up to the other one. Don't worry it will run just fine. I did this after buffing the blue off my headers, which was after dialing in the jetting. Sure enough one got a little gold and the other got no color. I swapped the leads and the other pipe turned gold within a day.
I've since replaced my stock coil with a Nology from New Bonneville, along with the Nology grounded plug wires. No spark imbalance now.
Cheers!
Scott
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Scott- ATL
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