Yellow crap drained from carb bowl what is it???

[Bretty]

I think there is an engine breather pipe that comes out the back/top of the engine into your airbox...
Yellow, sounds like a mixture of oil and water..

I've no idea how it gets there as I've not experienced it before... It could just be condensation, she might just want a good run if it's been sat all winter. Clean it up and give it a good motorway run.