I hear a ticking noise while sitting at a stop light or something if I have put about 90 plus miles on the clock. I am pretty sure it is the fuel valve since it is one of those with the ball in it that is not supposed to let fuel run out even in the on position, if the engine isn't running. I think as the tank gets lower on fuel this sound is amplified through the tank? When I fill the bike up the sound goes away.
Hope this helps.