Are you a troll? It's a ****ing nestle candy wrap We all put candy wraps in our airboxes for that easy extra 1hp.

Jokes aside, clean that thing out lol. Not sure what all the grime is could be molten chocolate. A little oil is normal but this second photo...

Best check that the lower airbox chamber is not blocked or full of chocolate otherwise water can't go anywhere. At least you'll have something to eat whilst cleaning.

Some info on the airbox can be found here: http://www.xt660.com/showthread.php?t=12547