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After rebuilding the carbs on my '72 xsb, the plugs are fouled with heavy ,black residue after only 25-30 miles. I can't figure out if its low spark or too rich/ lean. I don't want to start randomly replacing coils, voltage regulator, etc..Help!
These would be the the centerpiece of my '72 resto. I haven't ridden in 30 years and just finishing getting it on the road again. It hadn't seen miles since '97.:bike: