If you want to undertake maintenance tasks on your Suzuki ST 250 then it is usually a great idea to have access to a Workshop Manual to keep just for reference in the event that you need to know how you can take out a specific part for example the Door and fit it again the right way.
Suzuki ST 250 Workshop Manuals offers you targeted diagnostic information on your vehicle therefore if something is faulty it helps you determine what the situation is and how you can resolve it. You can then evaluate if this can be done yourself or in the event the job is just too big you can book your ST 250 in with a decent repair garage.
Suzuki ST 250 manual