If you have to accomplish fixes on your Kawasaki KX 450F then it is always a good idea to own a Workshop Manual for a reference in the event you want to know methods to take off a particular part like the Wheel Bearing and match it again safely.
Kawasaki KX 450F Workshop Manuals will give specific diagnostic details with regards to your vehicle therefore if something is faulty it will help you discover what the problem is and some ways to resolve it. You will be able to determine if this can be done by yourself or in case the job is just too big you can book your KX 450F in to a suitable garage.
Kawasaki KX 450F manual