Thanks, everybody, for your useful replies. I only got about a cup full of oil out of the casing. The casing I took off was on the left side looking forward. The small cover which has “Honda” on it and held on by screws didn’t want to budge. The larger cover which the aforementioned small cover attaches to and held on by about 8 bolts was the one I removed to find the oil. Didn’t look as though it had ever been off in the 26 thousand miles this engine has done. Will keep digging.