If you need to carry out auto repairs on your Jawa 640 Black Style then it is usually a great idea to have access to a Workshop Manual to keep just for reference in the event that you want to know methods to strip off a certain part much like the Wheel Bearing and fit it again in the correct way.
Jawa 640 Black Style Workshop Manuals are able to offer unique diagnostic info on your vehicle so if something is playing up it will help you determine what the issue is and tips on how to make it better. Then you are able to determine if you can do this by yourself or if ever the job is too big you can actually make a booking for your 640 Black Style right into a nearby mechanic.
Jawa 640 Black Style manual