If you choose to accomplish repairs to your KTM EXC 300 then it will always be a good plan to have access to a Workshop Manual to keep just for reference should you want to know the way to strip off a particular component for instance the Clutch and fit it again perfectly.
KTM EXC 300 Workshop Manuals offers clear targeted diagnostic info for the car so if something is broken it can help you discover what the situation is and tips on how to fix it. Then you are able to evaluate if you can do this on your own or in case the job is too big it is possible to book your EXC 300 into a trusted garage.
KTM EXC 300 manual