I'm a new owner of an 2002 softail w/7000 mile (First Harley). So my question is that behind the cylinder head on the main black casting of the motor the is a small 1/4 inch long 1/8 inch wide hold . I was told it was a breather port. Is this correct and is it ok for a small amount of oil to escape from this hold? doesn't seem to be lots of oil Just noticeable after a 100 mile or so.