If you have to conduct repairs on your Yamaha YAS1 then it is usually recommended to have access to a Workshop Manual to keep just for personal reference in case that you need to know the best way to take out a particular component such as the Brake Pads and fit it again properly.
Yamaha YAS1 Workshop Manuals gives you specific diagnostic information for your automobile therefore if something is faulty it will help you understand what the situation is and easy methods to make it better. Then you are able to determine if this can be achieved by yourself or if ever the job is too big you could make a reservation for your YAS1 in to a suitable friendly mechanic.
Yamaha YAS1 manual