I recently acquired one of those fat shop binders for this model series. It's been somewhat difficult for me to track down much info about this bike over the two years I've owned it, but this will help me a lot in restoring my basket case. Hope it helps you. The links below will download .pdfs directly from my cloud storage. XL500S XL500R 79-82 (62.6MB) (link) XR500A 81-82 (40MB) (link) XL500R 83-84 (45.5MB) (link) P.S. Probably the best upgrade you can perform is a front end swap for a CR500 of the same era (try 85?), which has the same size tapered needle bearings. It's literally plug-and-play for a front disc and beefier forks.