Common sense and knowledge of engines are two separate things. There's nothing wrong with asking a question like this for peace of mind. Not everyone understands how engines work. This community is about HELPING eachother regardless of how we feel about the members question. Until you understand that, we really don't need you here. Op, no, this couldn't cause any damage to your motor. In rare instances it could damage the coil, but if you're bike is running properly after reconnecting the spark plug wire, there's no reason to believe you did any damage. In the future, please continue to ask ANY questions you need help or advice on because the rest of us ARE here to help. Yea, we have some ******** like Kevin R, but most of us are happy to help. And don't be too hard on Kevin r, clearly he's just a miserable, whiny, ***** with a low IQ, and poor social skills. Not everybody has common sense these days.