Clymer Service Manual. Features maintenance, troubleshooting and repair tips to help keep your bike on the road! Every Clymer manual includes text written from hands-on experience based on a complete disassembly of the machine. Step by step instructions linked to hundreds of easy to follow photo's. Includes instructions on how to fabricate shop tools, whenever possible reducing the need for factory tools and thumb tabbed chapters and detailed index to make quick content location possible. Covers the following models Yamaha XS750 (1977-79), XS750II (1977-79), XS850 (1980-81), XS850S (1980-81)