If you need to perform auto repairs for your Yamaha YZ490 then it will always be a good idea to have access to a Workshop Manual to use as a guide in case that you want to know techniques to remove a certain part much like the Wheel Bearing and install it again effectively.
Yamaha YZ490 Workshop Manuals can provide specified diagnostic wisdom for the vehicle therefore if something is broken it can help you determine what the issue is and some ways to correct it. Then you are able to decide if this can be achieved on your own or if ever the job is simply too big you are able to book your YZ490 into a nearby repair garage.
Yamaha YZ490 manual