If you choose to execute maintenance tasks to your KTM 690 Duke then it is always recommended to have a Workshop Manual for personal reference in case you need to know proven methods to strip off a particular component such as the Wheel and fit it again in the right way.
KTM 690 Duke Workshop Manuals provide you with special diagnostic details with regards to your automobile so if something is not working it can help you identify what the situation is and some ways to fix it. Then you are able to analyse if this can be achieved by yourself or in the event the job is simply too big you can actually make a reservation for your 690 Duke in with a trusted friendly mechanic.
KTM 690 Duke manual