2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 207Get this manual
CRANKSHAFT CRANKSHAFT
JobPart Removing the crankshaft Crankcase Crankshaft
Remarks Remove the parts in the order listedSeparateRefer to "CRANKCASE"Refer to "REMOVING THE CRANKSHAFT" and "INSTALLING THE CRANKSHAFT"For installation, reverse the removal procedure