No such thing as a "master key," every spyder key is different. Different cut and different chip. Because I have key issues, I have 4 chipped and cut keys ($55each+$10cut each). Wife has one, I have one, one at home in a drawer, and one hidden on the spyder. Any one of them will start the spyder. Plus, I have 4 unchipped keys that will open the front and rear tunks, and raise the seat, attached to all of our key rings. So, if you are unlike me and don't have boocoo keys for your ride and are away from home and lose your key like I've done, goooood luck.