If you wish to execute auto repairs on your BMW F 650 GS then it is always a good idea to have a Workshop Manual to keep just for personal reference just in case you need to know simple methods to strip off a specific component for example Drive Shaft and install it again correctly.
BMW F 650 GS Workshop Manuals will provide you with precise diagnostic info on your car therefore if something is playing up it will help you understand what the issue is and ways to resolve it. You can then assess if you can do this yourself or in case the job is simply too big it is possible to make a reservation for your F 650 GS in with a decent repair garage.
BMW F 650 GS manual