Anssi,
Ok...thanks for the advice. I noticed the chatter when I was riding a little bit slower and then getting on the gas. Is anything being damaged by it? Did you do the mod to your clutch? If you did, was there any difference in performance?
What other mods have you done to your bike? Is there anything I need to be aware of? I heard a 4oz flywheel weight helps out. Mine has a one larger toothe rear sprocket (49).
To be honest, from all of the reviews I was expecting this bike to be too much to handle, and to my surprise it wasn't at all. I DID NOT notice any "hit" like people said (i'm comparing it to a CRF). The bike was so smoothe, yet had tons of power. I had a blast riding it for the first time last night. I am so glad that I stuck with Yamaha on this one.
Thanks for all the info.