If you choose to accomplish adjustments on your KTM 450 SMC USA then it is usually a good idea to have access to a Workshop Manual to keep just for personal reference if you want to know how to take off a certain part including Clutch and install it again safely.
KTM 450 SMC USA Workshop Manuals are able to offer precise diagnostic guides for the car therefore if something is broken it helps you identify what the problem is and how to resolve it. You can then determine if this can be achieved yourself or if the job is too big you can make a booking for your 450 SMC USA right into a decent mechanic.
KTM 450 SMC USA manual