I have a breather for my crankcase, but I need to remove my oil filler neck to orient it around for the breather to mount sideways (to clear my STB).

I've tried tugging, pulling, rotating, etc. to no avail. Anyone have any idea how this thing comes off?

Thanks.

 

Need to pull the valve cover. There is a small clip that needs to be pressed while twisting it. BTW, some are a PITA.