If you want to accomplish adjustments for your Giantco Athena II 125 then it is usually a good plan to own a Workshop Manual to use as reference in case that you want to know proven methods to strip off a specific part such as the Exhaust and fit it again safely.
Giantco Athena II 125 Workshop Manuals can provide unique diagnostic guidelines for your automobile so if something is faulty it helps you work out what the situation is and some ways to resolve it. You will be able to decide if this can be achieved by yourself or in case the job is just too big you can make a booking for your Athena II 125 in with a trusted car garage.
Giantco Athena II 125 manual