I have an annoying noise coming from my bike, and I dont know what it is. When I shift into neutral and let the cluctch lever (when sitting at a light, or whatever) out there is a shaking, ticking sound. When I pull on the clutch in the sound goes away. It doesnt make this sound all the time, come to think of it it doesnt make the sound until a couple minutes into the ride. Any ideas of what it coule be?