Ebay usually has manuals for some of the older motors......if looking for a SERVICE manual just make sure it clearly states that it is, and not a PARTS manual, although the parts manuals can come in handy with their diagrams and part numbers.
That might be a tough find, those were not very popular, so finding one might be a challenge. Post wanted ads, look at all the sales platforms, check the antique outboard assoc. Gotta be one out there somewhere !
