Yamaha YZ450FP 2023 Owner's Service Manual page 217

Bolt [1]
3rd
Specified angle
90
k. Perform the same procedure with the bolts
[2]–[4] one by one and applying the tight-
ening sequence (f)–(j) as shown for the
bolt [1].
TIP
Do not loosen any other bolt until one bolt is
completely tightened.
Bolt [2]–[4]
2nd
18 N·m (1.8 kgf·m, 13 lb·ft)
3rd
Specified angle
90
l. Retighten the bolt (cylinder head) in the
proper tightening sequence.
Final
Specified angle
60
m. Tighten the bolts to the specified torque.
Bolt [5], [6]
12 N·m (1.2 kgf·m, 8.9 lb·ft)
LOCTITE®
90˚
5-21
CYLINDER HEAD