I have an 01 YZ426. I'm installing a new chainand gears in it. However, I can't seem to get the drive sprocket off. One of my reasons is I can't figure out what size the nut is that holds the sprocket on. 2nd, Is it a reverse thread nut or is it the old "lefty loosy, righty tighty" kind of nut. Thanks for any help you can provide.