If you want to accomplish maintenance to your Kymco Zing then it will always be a great idea to have access to a Workshop Manual for a reference in the event that you need to know tips to take out a particular component much like the Gearbox and install it again correctly.
Kymco Zing Workshop Manuals can offer you certain diagnostic guidelines on your vehicle so if something is playing up it will help you identify what the situation is and some ways to correct it. You will be able to decide if this can be done by yourself or if ever the job is just too big you can actually make a reservation for your Zing in to a nearby car garage.
Kymco Zing manual