Yamaha YZ450FX 2019 Owner's Service Manual page 222

i. Retighten the cylinder head mounting bolts in
the proper tightening sequence.
j. Put a mark on the corner of the bolt (cylinder
head) and the cylinder head.
k. Retighten the cylinder head mounting bolts in
the proper tightening sequence.
TIP
Tighten the bolts in two steps (90 and 60) to
reach the specified angle in the proper tighten-
ing sequence.
Bolt "1"–"4"
3rd
Specified angle
90
Final
Specified angle
Bolt "1", "2", "3": 60 (149 mm
(5.87 in))
Bolt "4": 90 (165 mm (6.49 in))
l. Tighten the bolts to the specified torque.
Bolt "5", "6"
10 N·m (1.0 kgf·m, 7.4 lb·ft)
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90˚
5-23
CYLINDER HEAD