If you need to execute maintenance on your Suzuki GSX R 250 then it is usually a good plan to possess a Workshop Manual for a reference should you need to know easy methods to take out a specific part including Gearbox and install it again accurately.
Suzuki GSX R 250 Workshop Manuals offers clear unique diagnostic info for the vehicle so if something is wrong it can help you discover what the problem is and methods to resolve it. After that you can assess if you can do this on your own or if the job is too big you can make a booking for your GSX R 250 in with a suitable friendly mechanic.
Suzuki GSX R 250 manual