If you want to accomplish fixes for your KTM GS 620 Duke then it is always a great idea to have a Workshop Manual to use as personal reference should you want to know how you can strip off a specific part for instance the Clutch and match it again in the correct way.
KTM GS 620 Duke Workshop Manuals are able to offer particular diagnostic guidelines for your car or truck therefore if something is faulty it can help you identify what the issue is and methods to correct it. Then you are able to analyse if you can do this yourself or if the job is too big you could make a reservation for your GS 620 Duke right into a trusted friendly mechanic.
KTM GS 620 Duke manual