If you buy a quart container of whatever oil, which generally comes in a plastic quart container and usually has measurement marks in oz. increments [32 oz. equals one quart] stamped right on one side of that plastic quart container,you can now use that for future measurements to put in as much or as little oz.of oil as required to complete your fill without over filling the crankcase.Follow me?? I sometimes buy my oil in a five qt.package and save one of those plastic quart containers for that purpose.
Ex. If your bike holds 4 1/2 quarts of oil,ya put in the gallon [4 quarts] then using one of the now empty quart containers, you put in the extra 16 oz.needed [as stamped on the side of that container] to complete the fill "WITHOUT OVER FILLING the crankcase.Follow me??? Dave!!!