If you choose to execute adjustments to your Jianshe Cub JS125 G then it will always be a great idea to possess a Workshop Manual to use as a reference just in case you need to know the best way to strip off a particular component for instance the Exhaust and match it again in the right way.
Jianshe Cub JS125 G Workshop Manuals provide you with targeted diagnostic information for the vehicle so if something is faulty it helps you figure out what the problem is and the way to correct it. You can then analyse if this can be done by yourself or that the job is simply too big you could make a booking for your Cub JS125 G right into a decent garage.
Jianshe Cub JS125 G manual