2001 Yamaha YFM660 Raptor Factory Service Manual, Page 201Get this manual
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CAMSHAFT AND CYLINDER HEAD
INSTALLING THE CAMSHAFT AND CYLINDER HEAD 1.Install: Cylinder head Bolts (M9 6)
38 Nm (3.8 kg, 27 ft lb) 10 Nm (1.0 kg, 7.2 ft lb)
Bolt (M67)