If you have to undertake adjustments to your Yamaha DS 6 then it is usually recommended to have a Workshop Manual to use as personal reference in the event that you want to know tips on how to strip off a specific part much like the Clutch and match it again appropriately.
Yamaha DS 6 Workshop Manuals will give you certain diagnostic details with regards to your car or truck therefore if something is broken it can help you work out what the problem is and how you can repair it. You can then evaluate if you can do this by yourself or in the event the job is just too big you can still make a reservation for your DS 6 into a suitable mechanic.
Yamaha DS 6 manual