OK, I'll stick my neck out and take a guess.
There is a rubber pipe that goes from the crankcase into the airbox. Can;t quite remember what it does, but I do know that if you have a little too much oil it sometimes flows up through this pipe into the airbox. There are also some other rubber pipes that come out of the airbox and drain out around the swingarm mounts.
A bit of moisture can come in to the airbox and if it mixes with the oil in the airbox it can get this colour.
It could just be that the oil pressure is a little bit high and its forced a bit of oil up the crankcase breather pipe into the airbox, and its dripped out these vent tubes.
In which case its nothing to worry about.
That's my guess 
However...
check that pipe on the side of the motor. It looks like an oil return pipe. It could be that the o-rings in the pipe aren't sealing quite right and the oil is leaking out.
And I to my motorcycle parked like the soul of the junkyard. Restored, a bicycle fleshed with power, and tore off. Up Highway 106 continually drunk on the wind in my mouth. Wringing the handlebar for speed, wild to be wreckage forever.
- James Dickey, Cherrylog Road.
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