same noise
my sons yz85 06 has the same noise i know what your talking about my prob is iam in iraq i bought the bike for him while i was here i bought a bunch of go fast parts i installed a hinson clutch kit basket,clutches,hub,and pressure plate i came home on leave and started installing these parts without listening to the bike frist never heard run anyway after i was done i started the bike and noticed that noise only when the clutch is releasd when you pull in the clutch it goes away that realy bothered me but i let him ride then i drained the oil it looked good no metel in the oil thats a good sign but it still worries me i had to come back to iraq and he is still rideing it my wife keeps changeing the oil after every ride bless her sole if you find out anything please let me know thank you.