How do you check the oil level on 1981 Honda gl 1100 goldwing?

This model has a site glass. With the bike on the center stand, look on the right side, ( foot brake side ) you will see a small glass window. Clean the glass, and with a flash lite in hand, engine running, have someone turn the engine off. You will see the oil settle in the window and it must be on the line to be full. That's the best way.