Join Date: Nov 2010
Location: Mostly Elmhurst, IL, sometimes Tomahawk, WI
A really dark brown plug is definitely running rich, hows the rear plug?
If the rear plug is similar, I'd say the intake is rich. If the rear plug is lighter tan color (what you want), then you have a problem with just the front cylinder...and that could be alot of things.
What do you mean by a Screaming Eagle Package...that could mean many different modifications? And the PC3 just adds to the compexity of figuring things out. If you don't work on your own bike and don't know exactly what was modified, its time to take it to a reputable shop.