If you need to do auto repairs for your IZH Jupiter 4 then it is usually recommended to have a Workshop Manual to keep just for reference if perhaps you need to know simple methods to take off a particular component like the Gearbox and install it again accurately.
IZH Jupiter 4 Workshop Manuals will give specified diagnostic guides for your car or truck so if something is faulty it can help you work out what the situation is and easy methods to resolve it. You will be able to assess if you can do this on your own or if the job is just too big you can actually make a booking for your Jupiter 4 into a suitable mechanic.
IZH Jupiter 4 manual