If you have to undertake fixes to your Yamaha XS 650 then it will always be a good idea to have access to a Workshop Manual to keep just for a guide if you need to know the best ways to take out a certain component for example, the Exhaust and fit it again perfectly.
Yamaha XS 650 Workshop Manuals gives you detailed diagnostic guides for the car so if something is not working it can help you find out what the issue is and how to fix it. After that you can assess if this can be achieved yourself or in the event the job is too big you are able to book your XS 650 in to a trusted mechanic.
Yamaha XS 650 manual