I have this hose end sticking out of the left hand side of my 88 VR ( California edition. It comes from within the engine's V, and is on off-shoot of a vertical rubber hose. It one of 2 or 3 hoses that come off of it.
http://greenagain.smugmug.com/photos/544914635_X9TH3-M.jpg
That is my finger pointing back towards where the hose comes from.
http://greenagain.smugmug.com/photos/544914681_nnjfC-M.jpg
http://greenagain.smugmug.com/photos/544914639_DkuYx-M.jpg