2008 YAMAHA YZ450F Owners Manual

Page 33 of 188

YAMAHA YZ450F 2008  Owners Manual 2-11
TIGHTENING TORQUES
Throttle cable (return) M12 × 1.0 1 11 1.1 8.0
Throttle cable cover M5 × 0.8 2 4 0.4 2.9
Hot starter plunger M12 × 1.0 1 2 0.2 1.4
Hot starter cable adjust bolt and locknut

Page 34 of 188

YAMAHA YZ450F 2008  Owners Manual 2-12
TIGHTENING TORQUES
*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 • k

Page 35 of 188

YAMAHA YZ450F 2008  Owners Manual 2-13
TIGHTENING TORQUES
△Front wheel axle and axle nut M16 × 1.5 1 105 10.5 75
△Front wheel axle holder M8 × 1.25 4 21 2.1 15
△Front brake disc and wheel hub M6 × 1.0 6 12 1.2 8.7
△Rear bra

Page 36 of 188

YAMAHA YZ450F 2008  Owners Manual 2-14
TIGHTENING TORQUES
1. First, tighten the steering ring nut approximately 38 Nm (3.8 m•kg, 27 ft•lb) by using the steering nut wrench, then loosen 
the steering ring nut one turn.
2. Retighten

Page 37 of 188

YAMAHA YZ450F 2008  Owners Manual 2-15
TIGHTENING TORQUES
GENERAL TORQUE 
SPECIFICATIONS
This chart specifies torque for stan-
dard fasteners with standard I.S.O. 
pitch threads. Torque specifications 
for special components or assem-

Page 38 of 188

YAMAHA YZ450F 2008  Owners Manual 2-16
LUBRICATION DIAGRAMS
LUBRICATION DIAGRAMS
1. Oil filter element
2. Oil pump
3. Drive axle
4. Main axle
5. Crankshaft
6. Connecting rod
A. From cylinder
B. To oil tank

Page 39 of 188

YAMAHA YZ450F 2008  Owners Manual 2-17
LUBRICATION DIAGRAMS
1. Intake camshaft
2. Exhaust camshaft
A. To main axle
B. From oil pump

Page 40 of 188

YAMAHA YZ450F 2008  Owners Manual 2-18
CABLE ROUTING DIAGRAM
CABLE ROUTING DIAGRAM
1. Fuel tank breather hose
2. Radiator hose 1
3. Cylinder head breather hose
4. Hose holder
5. Radiator hose 4
6. Clutch cable
7. Connector cover
8. Fu