If you wish to accomplish fixes for your TM racing EN 300 then it is always a good idea to own a Workshop Manual for personal reference in the event you want to know simple methods to take off a particular component for example Clutch and fit it again accordingly.
TM racing EN 300 Workshop Manuals will give you specific diagnostic guidelines on your vehicle so if something is wrong it helps you identify what the situation is and methods to correct it. After that you can evaluate if you can do this yourself or if ever the job is simply too big it is possible to book your EN 300 in with a decent friendly mechanic.
TM racing EN 300 manual