TIGHTENING TORQUES
2-12
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
LT
x4
FWD
3
3
1
1
4
4
2
2
Summary of Contents for YZ450F 2021
Page 6: ...EAM20162 YAMAHA MOTOR CORPORATION U S A YZ MOTORCYCLE LIMITED WARRANTY ...
Page 10: ......
Page 44: ...MOTORCYCLE CARE AND STORAGE 1 32 ...
Page 61: ...TIGHTENING TORQUES 2 16 ...
Page 62: ...CABLE ROUTING DIAGRAM 2 17 EAM20152 CABLE ROUTING DIAGRAM Frame and engine left side view ...
Page 64: ...CABLE ROUTING DIAGRAM 2 19 Frame and engine right side view ...
Page 66: ...CABLE ROUTING DIAGRAM 2 21 Handlebar front view ...
Page 68: ...CABLE ROUTING DIAGRAM 2 23 Frame and engine top view ...
Page 70: ...CABLE ROUTING DIAGRAM 2 25 Frame and battery top view ...
Page 72: ...CABLE ROUTING DIAGRAM 2 27 Rear brake right side view ...
Page 74: ...CABLE ROUTING DIAGRAM 2 29 ...
Page 112: ...ELECTRICAL SYSTEM 3 36 ...
Page 148: ...REAR BRAKE 4 34 system Refer to BLEEDING THE HYDRAULIC BRAKE SYSTEM on page 3 25 ...
Page 189: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 5 3 1 Connecting rod 2 Oil nozzle 3 Crankshaft ...
Page 191: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 5 5 1 Oil filter element 2 Oil pump 3 Oil strainer ...
Page 262: ...TRANSMISSION 5 76 ...
Page 272: ...WATER PUMP 6 9 ...
Page 282: ...THROTTLE BODY 7 9 ...
Page 289: ...IGNITION SYSTEM 8 6 ...
Page 290: ...ELECTRIC STARTING SYSTEM 8 7 EAM20143 ELECTRIC STARTING SYSTEM EAM30279 CIRCUIT DIAGRAM ...
Page 294: ...CHARGING SYSTEM 8 11 EAM20144 CHARGING SYSTEM EAM30282 CIRCUIT DIAGRAM ...
Page 297: ...CHARGING SYSTEM 8 14 ...
Page 298: ...FUEL INJECTION SYSTEM 8 15 EAM20145 FUEL INJECTION SYSTEM EAM30284 CIRCUIT DIAGRAM ...
Page 321: ...FUEL INJECTION SYSTEM 8 38 ...
Page 322: ...FUEL PUMP SYSTEM 8 39 EAM20146 FUEL PUMP SYSTEM EAM30287 CIRCUIT DIAGRAM ...
Page 352: ...SELF DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE 9 15 ...
Page 362: ...CHASSIS 10 9 ...
Page 364: ......
Page 366: ......
Page 368: ...YZ450FM 2021 WIRING DIAGRAM B2W 2819U 11_W D indd 2 2020 02 05 10 21 39 ...