I have a copy of the 1939 parts list book, I can scan images of the Sportwin parts list if you like.
I completed a mechanical reconditioning of a similar motor last winter, so unless somebody has an operators manual to cover your model, I can probably write something out for you WRT maintainance and repair.
I’m in the Windsor area and I’m in the club directory. You can call if you feel like it. Hope this helps.
Best,
PM T2 (aka Chris Scratch)