If you choose to execute fixes to your Jianshe Knight JS125 4X F2 then it will always be a good plan to have access to a Workshop Manual to keep just for reference in case you need to know techniques to take off a certain component for example Door and match it again safely.
Jianshe Knight JS125 4X F2 Workshop Manuals will give you identifiable diagnostic info with regards to your car therefore if something is broken it can help you identify what the problem is and how you can correct it. You will be able to determine if you can do this by yourself or if the job is too big you could make a booking for your Knight JS125 4X F2 right into a suitable friendly mechanic.
Jianshe Knight JS125 4X F2 manual