2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 203Get this manual
CRANKCASE EBS00332
SEPARATING THE CRANKCASE 1Separate: right crankcase left crankcase
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aRemove the crankcase boltsNOTE: Loosen each bolt 14 of turn at time and after all the bolts are loosened, remove them Loosen the bolts in stages, using crisscross patternLeft crankcase