If you need to perform maintenance on your Suzuki RM 125 then it is always a good plan to have access to a Workshop Manual for reference if perhaps you need to know tips to strip off a specific part for instance the Clutch and match it again effectively.
Suzuki RM 125 Workshop Manuals will give identifiable diagnostic details on your vehicle therefore if something is broken it can help you find out what the situation is and some ways to resolve it. You will be able to decide if you can do this by yourself or if the job is too big you can actually make a reservation for your RM 125 into a suitable car garage.
Suzuki RM 125 manual