2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 158Get this manual
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CYLINDER HEAD ENG
4 Install: cylinder head nuts
10 Nm (1.0 kg, 7.2 ft lb)TR
Install: copper washers New oil delivery pipe union bolts (M8) 2
18 Nm (1.8 kg, 13 ft lb) 20