Otherwise Ken Cook in the US have the copyright on all manuals etc and can supply copies ( at a price) up to 1996. I cannot locate your model number though. Possibly because it's a Belgium made one but try www.outboardbooks.com.
You may come across one on ebay, but doubtful. Also doubtful if you will find a satisfactory 3rd party manual. Eg Seloc or Clymer
Oakley are your best bet I think. But be clear are you after an owners manual or a full workshop manual.
Its a pretty basic thing and you will find the diagrams on the parts lists useful