If you choose to undertake adjustments on your own Husqvarna SM 125S then it will always be a great idea to have access to a Workshop Manual to use as a reference in the event you want to know how you can remove a specific part including Clutch and install it again accordingly.
Husqvarna SM 125S Workshop Manuals can provide certain diagnostic guidelines with regards to your car therefore if something is broken it can help you discover what the situation is and methods to correct it. Then you are able to decide if this can be done yourself or if ever the job is simply too big you can still book your SM 125S right into a nearby friendly mechanic.
Husqvarna SM 125S manual