2008 YAMAHA YZ450F Owners Manual

Page 113 of 188

YAMAHA YZ450F 2008  Owners Manual 4-45
KICK SHAFT AND SHIFT SHAFT
INSTALLING THE SHIFT GUIDE 
AND SHIFT LEVER ASSEMBLY
1. Install:
• Spring "1"
• Pawl pin "2"
•Pawl "3"
To shift lever "4".
Apply the engine oil on the spring, 
pa

Page 114 of 188

YAMAHA YZ450F 2008  Owners Manual 4-46
KICK SHAFT AND SHIFT SHAFT
5. Hook:
• Torsion spring "1"
Turn the torsion spring clockwise and 
hook into the proper hole "a" in the 
crankcase.
INSTALLING THE KICK IDLE 
GEAR
1. Install:
• K

Page 115 of 188

YAMAHA YZ450F 2008  Owners Manual 4-47
CDI MAGNETO
CDI MAGNETO
REMOVING THE CDI MAGNETO
Order Part name Qty Remarks
Seat and fuel tank  Refer to "SEAT, FUEL TANK AND SIDE 
COVERS" section.
Disconnect the CDI magneto lead.
1 Left cran

Page 116 of 188

YAMAHA YZ450F 2008  Owners Manual 4-48
CDI MAGNETO
REMOVING THE ROTOR
1. Remove:
• Nut (rotor) "1"
• Washer
2. Remove:
• Rotor "1"
Use the rotor puller 2.
CHECKING THE CDI MAGNETO
1. Inspect:
• Rotor inner surface "a"
• Stat

Page 117 of 188

YAMAHA YZ450F 2008  Owners Manual 4-49
ENGINE REMOVAL
ENGINE REMOVAL
REMOVING THE ENGINE
Order Part name Qty Remarks
Hold the machine by placing the suitable stand 
under the frame.Refer to "HANDLING NOTE".
Seat and fuel tank Refer t

Page 118 of 188

YAMAHA YZ450F 2008  Owners Manual 4-50
ENGINE REMOVAL
Engine guard
1 Neutral switch 1
2 Drive chain sprocket cover 1
3 Nut (drive sprocket) 1 Refer to removal section.
4 Lock washer 1 Refer to removal section.
5 Drive sprocket 1 Refer

Page 119 of 188

YAMAHA YZ450F 2008  Owners Manual 4-51
ENGINE REMOVAL
HANDLING NOTE
Support the machine securely so 
there is no danger of it falling over.
REMOVING THE DRIVE 
SPROCKET
1. Remove:
• Nut (drive sprocket) "1"
• Lock washer "2"
• S

Page 120 of 188

YAMAHA YZ450F 2008  Owners Manual 4-52
ENGINE REMOVAL
2. Install:
• Lock washer "1" 
• Nut (drive sprocket) "2"
Tighten the nut while applying the 
rear brake.
Make sure to tighten to specifica-
tion; otherwise, it may damage the