If you need to conduct repairs on your own Yamaha FZS 600 S then it is usually a good idea to have a Workshop Manual for personal reference in case that you need to know easy methods to strip off a particular part for instance the Clutch and install it again safely.
Yamaha FZS 600 S Workshop Manuals will give you detailed diagnostic wisdom on your automobile so if something is playing up it will help you identify what the problem is and the way to make it better. You can then assess if this can be achieved on your own or that the job is simply too big you could book your FZS 600 S in with a decent mechanic.
Yamaha FZS 600 S manual