Running with only the timed breather on my Shadow made a big difference over an open breather. My father fitted an Indian breather to the mag cover way back in the '50s. When we put the Shadow back together in the '80s, I had enough oil going out the valve lifter hole that on cross country rides, I would replace about a quart of oil over a 500 mile day. Eventually, the tubing kept falling out of the cast Indian right angle fitting, and I ran it for awhile with no tubing. Not much oil came out of there onto the timing chest cover. One day when I had the mag cover off, I noticed the hole in the Indian fitting was pretty darn small. By this time the elephant trunk was well known, and I figured that tiny little hole wasn't doing any good, so I blocked it off. Now that I'm back to just the standard breather, the Shadow is almost completely oil tight, I'll get one or two drops directly under the motor when I park. Haven't really traced it, but maybe it might just be coming from the end of the timed breather hose.