If you choose to execute maintenance for your Yamaha X City 125 then it is always recommended to have a Workshop Manual for a reference in case that you want to know tips to take off a particular part for instance the Clutch and install it again properly.
Yamaha X City 125 Workshop Manuals will provide you with unique diagnostic information for the vehicle therefore if something is wrong it will help you find out what the problem is and easy methods to resolve it. You can then evaluate if you can do this on your own or that the job is just too big you can actually book your X City 125 in to a decent mechanic.
Yamaha X City 125 manual