If you have to perform adjustments to your Jawa 812 Millennium then it is usually a good idea to have access to a Workshop Manual to keep just for a reference in case you want to know tips on how to remove a particular part much like the Wheel and install it again perfectly.
Jawa 812 Millennium Workshop Manuals are able to offer targeted diagnostic guides for the vehicle therefore if something is wrong it helps you identify what the problem is and how you can repair it. You will be able to assess if you can do this on your own or if ever the job is simply too big you could make a reservation for your 812 Millennium right into a decent mechanic.
Jawa 812 Millennium manual