They don't really have one, I've seen schematic blow ups a long time ago, and but that's over the shoulder at the factory. That was mostly with the older bikes when I would go in to get parts, and they would pull up that were not in the service portal. Well that was back in 2013 maybe earlier, or who knows I've been around.
I think you would be better off posting a picture of what you need and some knowledgeable people might guide you in the right direction.
They don't give out much information, besides like some have posted the belt replacement service procedures
dvdwin Got the laptop out so I can give you options on your wheels FXS vs FX
Edit:
I think everyone who wanted to order parts posted a picture of what they wanted, they might be able to get some zero people or people who have bought the stuff hint hint... to post what they do have, like has been posted on here about the service portal, and or some people know what some part numbers are... or have some drawings here and there from projects they had,