If you wish to accomplish maintenance to your Kymco Sooner 100 then it is usually a good idea to have a Workshop Manual for reference in case you want to know the right way to remove a particular component for example the Exhaust and fit it again accordingly.
Kymco Sooner 100 Workshop Manuals will give particular diagnostic wisdom for the car so if something is not working it will help you figure out what the problem is and methods to correct it. Then you are able to analyse if this can be achieved on your own or in case the job is too big you can actually make a booking for your Sooner 100 into a trusted repair garage.
Kymco Sooner 100 manual