2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 301Get this manual
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SWINGARM AND DRIVE CHAIN EBS00498
INSTALLING THE DRIVE SPROCKET 1 Install: drive sprocket lock washer New 75 Nm (7.5 kg, 54 ft lb) nut 2 Bend the lock washer tab along flat side of the nu