If you choose to perform adjustments to your Honda CB 250 G then it is always a good plan to have access to a Workshop Manual to keep just for a reference in the event that you want to know the right way to remove a specific part including Brake Discs and install it again appropriately.
Honda CB 250 G Workshop Manuals gives you special diagnostic information with regards to your car or truck so if something is not working it helps you find out what the issue is and tips to fix it. After that you can determine if you can do this yourself or in case the job is just too big you are able to make a reservation for your CB 250 G in with a decent friendly mechanic.
Honda CB 250 G manual