Yamaha YZ450F(Y Owner's Manual page 34

Part to be tightened
Screw (kickstarter crank)
Primary drive gear
Clutch boss
Clutch cable adjust bolt and locknut
Clutch spring
Balancer
Balancer shaft driven gear
Balancer weight
Drive sprocket
Drive chain sprocket cover
Shift pedal
Shift guide
Stopper lever
Segment
*1: Tighten the cylinder head bolts to 30 Nm (3.0 m•kg, 22 ft•lb) in the proper tightening sequence, remove and retighten
the cylinder head bolts to 20 Nm (2.0 m•kg, 14 ft•lb) in the proper tightening sequence, and then tighten the cylinder head
bolts further to reach the specified angle 180° in the proper tightening sequence.
CHASSIS
△ - marked portion shall be checked for torque tightening after break-in or before each race.
Part to be tightened
Upper bracket and outer tube
△
Lower bracket and outer tube
△
Upper bracket and steering stem
△
Handlebar upper holder
△
Handlebar lower holder
△
Steering ring nut
△
Front fork and damper assembly
Front fork and adjuster
Damper assembly and base valve
Adjuster and damper assembly
Bleed screw (front fork) and base valve
Front fork and front fork protector
△
Front fork protector and brake hose holder
△
Throttle grip cap
Clutch lever holder
Clutch lever mounting nut
Clutch lever position lock nut
Hot starter lever holder
Front brake master cylinder and bracket
△
Front brake master cylinder cap
Brake lever mounting bolt
TIGHTENING TORQUES
Thread size Q'ty
M6 × 1.0
M20 × 1.0
M20 × 1.0
M6 × 0.75
M6 × 1.0
M10 × 1.0
M14 × 1.0
M6 × 1.0
M20 × 1.0
M6 × 1.0
M6 × 1.0
M6 × 1.0
M6 × 1.0
M8 × 1.25
Thread size Q'ty
M8 × 1.25
M8 × 1.25
M24 × 1.0
M8 × 1.25
M10 × 1.25
M28 × 1.0
M51 × 1.5
M22 × 1.25
M42 × 1.5
M12 × 1.25
M5 × 0.8
M6 × 1.0
M6 × 1.0
M5 × 0.8
M6 × 1.0
M6 × 1.0
M5 × 0.8
M5 × 0.8
M6 × 1.0
M4 × 0.7
M6 × 1.0
2-12
Tightening torque
Nm m•kg
1 7 0.7
1 110 11.0
1 75 7.5
1 4 0.4
6 10 1.0
1 45 4.5
1 50 5.0
3 10 1.0
1 75 7.5
2 8 0.8
1 12 1.2
2 10 1.0
1 10 1.0
1 30 3.0
Tightening torque
Nm m•kg
4 21 2.1
4 21 2.1
1 145 14.5
4 28 2.8
2 34 3.4
1 Refer to TIP.
2 30 3.0
2 55 5.5
2 29 2.9
2 29 2.9
2 1 0.1
6 5 0.5
2 8 0.8
2 4 0.4
2 5 0.5
1 4 0.4
1 5 0.5
2 4 0.4
2 9 0.9
2 2 0.2
1 6 0.6
ft•lb
5.1
80
54
2.9
7.2
32
36
7.2
54
5.8
8.7
7.2
7.2
22
ft•lb
15
15
105
20
24
22
40
21
21
0.7
3.6
5.8
2.9
3.6
2.9
3.6
2.9
6.5
1.4
4.3