Yamaha YZ125 2021 - Engine Tightening Torques

TIGHTENING TORQUES
2-10
EAM30203
ENGINE TIGHTENING TORQUES
TIP
- marked portion shall be checked for torque tightening after break-in or before each race.
Item
Thread
size
Q’ty Tightening torques Remarks
Spark plug M14S 1 20 N·m (2.0 kgf·m, 15 lb·ft)
Cylinder head nut M8 5 28 N·m (2.8 kgf·m, 21 lb·ft)
Cylinder head stud bolt M8 5 13 N·m (1.3 kgf·m, 9.6 lb·ft)
Cylinder nut M8 4 30 N·m (3.0 kgf·m, 22 lb·ft)
Cylinder stud bolt M10 4 13 N·m (1.3 kgf·m, 9.6 lb·ft)
Power valve cover screw M5 4 5 N·m (0.5 kgf·m, 3.7 lb·ft)
Power valve link lever bolt M4 1 4.0 N·m (0.40 kgf·m, 3.0 lb·ft)
Power valve M5 4 8 N·m (0.8 kgf·m, 5.9 lb·ft)
Push rod bolt M5 1 4.5 N·m (0.45 kgf·m, 3.3 lb·ft)
Thrust plate screw M5 1 4.0 N·m (0.40 kgf·m, 3.0 lb·ft)
Governor fork screw M4 2 5 N·m (0.5 kgf·m, 3.7 lb·ft)
Power valve housing bolt M5 3 4.0 N·m (0.40 kgf·m, 3.0 lb·ft)
Water pump housing cover bolt M6 4 10 N·m (1.0 kgf·m, 7.4 lb·ft)
Coolant drain bolt M6 1 10 N·m (1.0 kgf·m, 7.4 lb·ft)
Radiator bolt M6 6 10 N·m (1.0 kgf·m, 7.4 lb·ft)
Radiator guard bolt M6 2 10 N·m (1.0 kgf·m, 7.4 lb·ft)
Radiator hose clamp M6 8 1.5 N·m (0.15 kgf·m, 1.1 lb·ft)
Air filter element M6 1 2.0 N·m (0.20 kgf·m, 1.5 lb·ft)
Carburetor joint bolt M6 4 10 N·m (1.0 kgf·m, 7.4 lb·ft)
Carburetor joint clamp M4 1 2.3 N·m (0.23 kgf·m, 1.7 lb·ft)
Air filter case joint clamp M4 1 2.3 N·m (0.23 kgf·m, 1.7 lb·ft)
Air filter case bolt M6 2 8 N·m (0.8 kgf·m, 5.9 lb·ft) 
Air filter guide clamp M5 1 3.5 N·m (0.35 kgf·m, 2.6 lb·ft)
Reed valve screw M3 6 1.0 N·m (0.10 kgf·m, 0.73 lb·ft)
Locknut (throttle cable handlebar
side)
M8 1 7 N·m (0.7 kgf·m, 5.2 lb·ft)
Locknut (throttle cable carburetor
side)
M6 1 4.0 N·m (0.40 kgf·m, 3.0 lb·ft)
Crankcase bolt M6 12 14 N·m (1.4 kgf·m, 10 lb·ft)
Crankcase cover screw (right) M6 8 10 N·m (1.0 kgf·m, 7.4 lb·ft)
Crankcase cover screw (left) M6 4 5 N·m (0.5 kgf·m, 3.7 lb·ft)
Drive sprocket cover screw M6 2 5 N·m (0.5 kgf·m, 3.7 lb·ft)
Bearing plate cover screw M6 4 10 N·m (1.0 kgf·m, 7.4 lb·ft)
Holder bolt M6 1 10 N·m (1.0 kgf·m, 7.4 lb·ft)
LT
LT