If you wish to undertake fixes for your CCM RL 125 then it is usually a good idea to own a Workshop Manual to use as reference in the event you need to know the way to remove a specific part including Exhaust and install it again in the correct manner.
CCM RL 125 Workshop Manuals are able to offer detailed diagnostic wisdom with regards to your car or truck therefore if something is faulty it helps you work out what the situation is and some ways to repair it. After that you can determine if this can be achieved yourself or if the job is too big it is possible to book your RL 125 right into a decent mechanic.
CCM RL 125 manual