I've put this exact sprocket on two XTs with no issue. I would jack up the rear wheel off the ground and turn the rear wheel and see where the noise is coming from. Also, if you have a stable jack, you can run the bike on the jack in first or second gear and see if there is binding or something going on.
2002 XT225 PC. Restoring to like new. Rox risers, jetting, 16t, X-ring, Skene LEDs, ceramic header, 3-horn mod, garage door mod.