If you have to accomplish fixes for your Yamaha XT 660 X Supermotard then it is usually a great idea to own a Workshop Manual to use as a reference if perhaps you need to know the way to take off a certain component such as the Drive Shaft and install it again in the correct manner.
Yamaha XT 660 X Supermotard Workshop Manuals are able to offer certain diagnostic info with regards to your car or truck so if something is wrong it helps you figure out what the problem is and easy methods to repair it. You will be able to decide if this can be achieved on your own or that the job is too big you can still make a booking for your XT 660 X Supermotard in with a decent friendly mechanic.
Yamaha XT 660 X Supermotard manual