Levers, your key/keys, lights, cables, fairings, everything can buz from vibration of the engine lol, you can let it drive you crazy or just ignore it. Unless you think it is a mechanical malfunction then you might wanna try to pinpoint the noise.
My head light buzzes. I heard it a couple of times then I decided to find it. While riding, just start touching things with a firm pressure and see if the noise changes or goes away. I'm going to add in some rubber washers at the mounting points hopefully solves my problem.