Yamaha WR450FB 2012 Owner's Service Manual page 225

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)
CYLINDER HEAD
6-17