Originally Posted by mike54
It could be the throttle bodies. The shaft wears and allows the butterfly to move in pulse with the intake. I would call that a tapping sound but some might call it knocking. Easy enough to put a finger on the shaft while the bike is running and see if it makes a difference.
There is a flat silver plate which is on the engine side of the throttle body that the throttle cable connects to. When I put a finger on that plate and apply some pressure the clicking noise even stops. I have the rebuild kit for both TB's which will be installed this winter.
For now, it sounds like a set of false teeth from a trick and joke shop