Yamaha YZ450FX 2023, Owner'S Manual

Page: 43 / 164

TIGHTENING TORQUES
2-10
TIP
Cylinder head bolt
First, tighten the cylinder head bolts to 40 N·m (4.0 kgf·m, 30 lb·ft) in the proper tightening sequence
and remove them. Retighten the cylinder head bolts to 23 N·m (2.3 kgf·m, 17 lb·ft) in the proper tight-
ening sequence. Tighten all bolts to reach the specified angle (90

) in a diagonal sequence, and then
tighten the cylinder head bolts further to reach the specified angle (60

) in the proper tightening se-
quence. (The first and second time, be sure to apply molybdenum disulfide grease to the bolt threads
and seats as well as to both sides of the washers.)
Shift pedal bolt M6 1 12 N·m (1.2 kgf·m, 8.9 lb·ft) 
Generator rotor nut M12 1 65 N·m (6.5 kgf·m, 48 lb·ft)
Stator coil screw M5 3 10 N·m (1.0 kgf·m, 7.4 lb·ft)
Crankshaft position sensor bolt M6 2 10 N·m (1.0 kgf·m, 7.4 lb·ft)
Stator coil assembly lead holder bolt M5 1 8 N·m (0.8 kgf·m, 5.9 lb·ft)
Coolant temperature sensor M10 1 15 N·m (1.5 kgf·m, 11 lb·ft)
Gear position switch bolt M5 2 3.5 N·m (0.35 kgf·m, 2.6 lb·ft)
Rectifier/regulator bolt M6 2 7 N·m (0.7 kgf·m, 5.2 lb·ft)
ECU bolt M5 2 3.8 N·m (0.38 kgf·m, 2.8 lb·ft)
Ignition coil bolt M6 2 7 N·m (0.7 kgf·m, 5.2 lb·ft)
Starter motor bolt M6 2 10 N·m (1.0 kgf·m, 7.4 lb·ft)
Nut (holder) M6 1 8 N·m (0.8 kgf·m, 5.9 lb·ft)
Throttle position sensor screw M5 1 3.5 N·m (0.35 kgf·m, 2.6 lb·ft)
Intake air pressure sensor screw M6 1 3.5 N·m (0.35 kgf·m, 2.6 lb·ft)
Item
Thread
size
Q’ty Tightening torques Remarks
LT
LT
LT
LT
x4
FWD
3 3
1 1 4 4
2 2