Yamaha YZ450FX 2021 Owner's Service Manual page 207

Removing the cylinder head
7 N ・ m (0.7 kgf ・ m, 5.2 lb ・ ft)
Order Job/Parts to remove
6 Oil passage plug
M
Q'ty
2
5-21
CYLINDER HEAD
1st 40 N ・ m (4.0 kgf ・ m, 30 lb ・ ft)
23 N ・ m (2.3 kgf ・ m, 17 lb ・ ft)
2nd
3rd
90˚
4th
60˚
6
10 N ・ m (1.0 kgf ・ m, 7.4 lb ・ ft)
LT
6
10 N ・ m (1.0 kgf ・ m, 7.4 lb ・ ft)
Remarks