If you choose to execute repairs on your own Jawa 812 Millennium then it is usually a good plan to own a Workshop Manual for a reference if you need to know simple methods to remove a specific part for instance the Gearbox and match it again accordingly.
Jawa 812 Millennium Workshop Manuals will give you specified diagnostic facts on your automobile therefore if something is not working it can help you discover what the problem is and tips to make it better. You can then determine if this can be achieved on your own or that the job is simply too big you can still book your 812 Millennium right into a suitable mechanic.
Jawa 812 Millennium manual