If you want to undertake fixes for your Sherco ST 125 then it is usually recommended to have access to a Workshop Manual to keep just for a guide just in case you need to know the way to take out a particular part including Door and fit it again accordingly.
Sherco ST 125 Workshop Manuals offers you detailed diagnostic info for your car or truck therefore if something is not working it will help you work out what the problem is and the way to make it better. After that you can determine if you can do this yourself or if ever the job is just too big you can make a booking for your ST 125 in to a nearby repair garage.
Sherco ST 125 manual