If you have to conduct fixes to your CH Racing WSM 50 MY then it is usually recommended to have access to a Workshop Manual for a reference in the event that you need to know ways to strip off a particular part much like the Gearbox and fit it again perfectly.
CH Racing WSM 50 MY Workshop Manuals gives you specified diagnostic info on your vehicle therefore if something is not working it can help you understand what the issue is and methods to correct it. You will be able to decide if you can do this by yourself or that the job is just too big you can actually make a booking for your WSM 50 MY in to a suitable mechanic.
CH Racing WSM 50 MY manual