I know this is for motocross. But. There is a lot of basic info here. Relevant to setting up any bike. Bike set-up and rider skill are the foundations for exhilarating and gratifying riding.

Race Preparation and Tuning Manual

YZ/IT – Race Preparation and Tuning Manual

Race Preparation and Tuning Manual

Early Accessories Catalogue. Not much XS related. Some minor XS1 stuff. Nostalgia

1970 Yamaha Accessories Catalogue

1970 Yamaha Accessories Catalogue

 

even pictures the (then new) XS1

1970 Yamaha Accessories Catalogue