Manuals
From GummyCarbs
Yamaha
Yamaha manuals are available from YamahaPubs.com (Crestec Inc.) and RepairManuals.com.
Yamaha has outsourced their printing to Crestec, the company behind YamahaPubs.com. I ordered a recently-printed shop manual for a 1993 GTS-1000 and found all of the images to be illegible. The company denied responsibility for this, blaming it on Yamaha.
Honda
Honda shop manuals are available from Helm Inc.