I have .pdf files of the following manuals:
You can e-mail me for a copy, but these are BIG files (as big as 11 mb) so make sure your e-mail account can handle it.
I have paper copies of most of the single-cylinder motors, two-cylinder motors, and some 4-cylinders. Over time, I hope to scan them too but for now, I can only snail-mail them.
All of these are working copies, not book-quality reproductions. I strongly encourage you to buy a real manual (new or used) when you have a chance.