If you have to undertake repairs on your Yamaha XS 400 US Custom then it will always be a good plan to own a Workshop Manual for a guide just in case you want to know the right way to remove a certain part for example the Wheel Bearing and match it again correctly.
Yamaha XS 400 US Custom Workshop Manuals can provide special diagnostic guidelines on your car therefore if something is not working it will help you discover what the situation is and tips on how to make it better. Then you are able to analyse if this can be achieved by yourself or that the job is simply too big you are able to book your XS 400 US Custom into a suitable friendly mechanic.
Yamaha XS 400 US Custom manual