Although the Yamaha site might not list your model, a manual for a slightly later model may be enough. I've got a Clymer manual for mine which is OK. They often cover a wide range of models in one book. Style is like a marine Haynes manual. There's another brand called Selec but the ones I've seen don't look as thorough.
If you're not in a hurry, there's often a few manuals at boat jumbles as well - guess there must be some round you?