Yamaha WR450FB 2012 Owner's Service Manual page 228

TIP
Tighten the bolts 90° in each of the two steps to
reach the specified angle of 180° in the proper
tightening sequence as shown.
Bolts "1" – "4"
Final
Specified angle 180°
g. Tighten the bolts to the specified torque.
Bolt "5", "6"
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
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1
2
6-17
CYLINDER HEAD