I have a 78 CB750f and took the oil tank and oil lines off to clean them. I found in the bottom of the tub, an extra washer. I have the one on the oil plug for the tank. and 1 extra. It looks like maybe it was in one of the lines where they connect to the tank, but on the parts list I have (75 CB750f) it does not show any washer in those lines. also it shows only one washer on the oil plug.
One oil line was leaking very badly. I removed them to replace them. Could this have been my problem?