Re: Just a few questions...
Heya, sorry I haven't kept up with your build. (sweet looking bike btw!)
That black goop is half burnt oil building up in your pipe. It's normal for running on 'break-in' mix. I'd triple check your exhaust gasket for leaks if its getting all over your frame...
For your idle, just turn in the idle screw until it doesn't die on you. You might need to take a little more slack out of your clutch cable, if it barely catches it will kill the motor at idle speed.
Best of luck!
Build with pride! Build to ride!
"A clean shop is a sure sign of a cluttered mind" ~ fasteddy