If you need to undertake adjustments for your Suzuki GSX 250 E then it will always be a good plan to have a Workshop Manual to keep just for personal reference if perhaps you want to know tips on how to remove a particular part for example, the Wheel and fit it again adequately.
Suzuki GSX 250 E Workshop Manuals are able to offer certain diagnostic info with regards to your vehicle so if something is wrong it helps you ascertain what the problem is and some ways to fix it. You can then determine if this can be achieved by yourself or in the event the job is just too big you can book your GSX 250 E right into a trusted friendly mechanic.
Suzuki GSX 250 E manual