If you have to undertake adjustments on your Sherco ST 125 then it is usually a good plan to have a Workshop Manual for personal reference just in case you want to know the right way to take off a certain part for example Gearbox and install it again perfectly.
Sherco ST 125 Workshop Manuals can provide identifiable diagnostic info on your car therefore if something is faulty it will help you discover what the issue is and easy methods to resolve it. You can then decide if this can be achieved yourself or that the job is simply too big it is possible to book your ST 125 into a decent garage.
Sherco ST 125 manual