Hey! I'm new to this forum, and I just PDF'd an old copy of the Haynes manual for the 1975-1984 XS250/360/400. It's about 47MB. Hopefully there's no problem with me sharing it here! :cheers:
https://www.dropbox.com/s/r0i632nh8gdhq8q/Yamaha%201975-1984%20XS250-360-400%20Haynes%20Manual.pdf?dl=0