1987-2009 Yamaha ATV YFM350X Warrior Raptor Service Manual, Page 148Get this manual
ENGINE ASSEMBLY AND ADJUSTMENT
8Install: -Cylinder head assembly CDBolts (cylinder head) (2) NOTE: Fasten safety wire to the timing chain so that it may not drop into the crankcase
9Tighten: -Bolts (cylinder head)
Flange bolt: 40 Nm (4.0 -kg, 29 tt-Ib) Hexagon bolt: 20 Nm (2.0 rn-kq, 14 ft-Ib)