If you wish to execute repairs on your Yamaha WR 450 F then it is usually recommended to possess a Workshop Manual to use as a guide in the event you want to know techniques to take off a specific part for example Brake Pads and match it again in the correct manner.
Yamaha WR 450 F Workshop Manuals will provide you with exact diagnostic wisdom for your car or truck therefore if something is faulty it will help you discover what the issue is and easy methods to repair it. You can then evaluate if this can be done yourself or if the job is too big you can still book your WR 450 F in to a nearby friendly mechanic.
Yamaha WR 450 F manual