I've owned four brand new sportbikes that were v-twin's and they all made a noise that sounded like a knock or a klank noise unlike anything any of my Inline fours. I am not saying your noise is normal because I have not heard it.
I have driven dozens of yamaha stars and virago's and after a while you become so used to it you are oblivious to the noise. I can say only that all twins in my opinion make more or different noise than inline fours.
If it bothers you take it to a different yamaha dealer and explain the situation to the tech. if he comes back with the same story that it is an inherent noise to the yamaha twin or if he feels it is a problem you will at least know if your noise is unique or nature of the beast.
if it is diagnosed by the other tech as normal engine noise and if this still bothers you ask for a free year extended warranty from yamaha (or purchase one if you bought the bike used) for peace of mind and hopefully it will let you enjoy your ride.
welcome to the forum
Last edited by macattack; 07-24-2008 at 01:21 PM.