If you need to carry out auto repairs for your Jawa 812 Millennium then it is always recommended to have a Workshop Manual to keep just for personal reference in the event that you need to know the best way to take out a particular part for example, the Drive Shaft and match it again in the correct manner.
Jawa 812 Millennium Workshop Manuals will give you particular diagnostic guidelines for the automobile therefore if something is wrong it can help you find out what the situation is and how you can make it better. You will be able to decide if you can do this on your own or if the job is just too big you could make a booking for your 812 Millennium into a local car garage.
Jawa 812 Millennium manual