If you need to do repairs to your Veli ZQ 90 then it is usually recommended to own a Workshop Manual to use as a reference should you want to know the best way to take out a specific part for example, the Drive Shaft and match it again efficiently.
Veli ZQ 90 Workshop Manuals offer you certain diagnostic information for the automobile so if something is wrong it will help you determine what the problem is and ways to fix it. You can then decide if you can do this by yourself or in case the job is just too big it is possible to make a booking for your ZQ 90 in to a trusted mechanic.
Veli ZQ 90 manual