If you wish to undertake maintenance tasks to your Honda CB 250 RS then it is usually recommended to have access to a Workshop Manual to use as a guide if perhaps you want to know simple methods to take out a certain part including Exhaust and install it again safely.
Honda CB 250 RS Workshop Manuals will provide you with special diagnostic facts with regards to your vehicle therefore if something is broken it can help you identify what the situation is and tips to resolve it. You can then evaluate if this can be achieved yourself or if ever the job is simply too big you can still book your CB 250 RS in with a decent friendly mechanic.
Honda CB 250 RS manual