I have a fluid reservoir on a cb350f that seems to have a plugged oil return hole. I can put the end of a scratch awl into the large hole and see the tip in the bore where the master cylinder assy. goes but when I try to put the smallest wire into the small oil return hole it seems to go in and then stop. I do not see it protruding into the bore the way the tip of the awl does in the big hole. Anyone have a procedure for cleaning the bore in this small opening?
