Yamaha YZ250FX 2021, Owner'S Service Manual

Page: 57 / 378

TIGHTENING TORQUES
2-12
TIP
Cylinder head bolt
Tighten all the cylinder head bolts evenly in the tightening order to 30 N·m (3.0 kgf·m, 22 lb·ft). Remove
the one bolt according to the tightening order. When doing so, do not remove the other bolts. Retighten
the bolt to 15 N·m (1.5 kgf·m, 11 lb·ft), and then tighten it further to reach the specified angle (60

). Re-
move the remaining bolts one by one in the same manner and retighten them. Finally, tighten all the
bolts to reach the specified angle (60

). Total tightening angle: 60

+ 60

= 120

(The first and second
time, be sure to apply molybdenum disulfide oil to the bolt threads and seats as well as to both sides of
the lock washers.)
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
3 3
1 1
4 4
2 2
FWD
x1 x 3