Please excuse the newbie question. Can someone tell me what the plug in the picture is? It's on the crank cover side of my '87 K75S, tucked under the side of the airbox. It looks to be partway out, but it is clearly old and the plastic is hardened so that I can't either press it or remove it without destroying it. If I am going to need to replace it, I would like to know what to ask for.
Thanks,
Brian