If you have to accomplish fixes for your Yamaha XJ 750 S then it is usually recommended to have a Workshop Manual to use as reference in the event you want to know how you can remove a particular component such as the Wheel and install it again the right way.
Yamaha XJ 750 S Workshop Manuals will provide you with identifiable diagnostic wisdom on your car therefore if something is faulty it will help you find out what the situation is and easy methods to repair it. After that you can analyse if this can be achieved yourself or in case the job is simply too big you can make a reservation for your XJ 750 S in with a suitable mechanic.
Yamaha XJ 750 S manual