If you want to undertake adjustments on your Honda CRF 230 F then it is always a great idea to have a Workshop Manual to use as a guide just in case you want to know the way to take off a certain part such as the Brake Discs and match it again efficiently.
Honda CRF 230 F Workshop Manuals are able to offer specific diagnostic info on your car therefore if something is playing up it can help you determine what the situation is and how to resolve it. After that you can assess if this can be achieved yourself or in case the job is too big you could make a booking for your CRF 230 F in to a decent repair garage.
Honda CRF 230 F manual