Here are some stuff I found online for Honda cx500
Usefull information on cx500 forum:
https://cx500forum.com/forum/general-discussion/10-quick-reference.html
Catalog numbers for parts:
https://www.cmsnl.com/
Owner manuals:
https://docs.google.com/document/d/1y3AtHDTEpItTvF77LK5wxwzej95kWTjYKjwC7zzFB6w/edit