2008 YAMAHA WR 450F charging

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Page 10 of 224

YAMAHA WR 450F 2008  Owners Manual CONTENTS
CHAPTER 1
GENERAL INFOR-
MATION
DESCRIPTION ................. 1-1
MACHINE 
IDENTIFICATION ............. 1-2
INCLUDED PARTS .......... 1-2
IMPORTANT 
INFORMATION................. 1-2
CHECKING

Page 39 of 224

YAMAHA WR 450F 2008  Owners Manual 2-12
MAINTENANCE SPECIFICATIONS
Charging system:
System type AC magneto ----
Model (stator)/manufacturer 5TJ 50/YAMAHA ----
Normal output 14 V/120 W at 5,000 r/min ----
Charging coil resistance (color

Page 82 of 224

YAMAHA WR 450F 2008  Owners Manual 3-27
ELECTRICAL
ELECTRICAL
CHECKING THE SPARK PLUG
1. Remove:
• Spark plug
2. Inspect:
• Electrode "1"
Wear/damage→Replace.
• Insulator color "2"
Normal condition is a medium to 
light tan col

Page 83 of 224

YAMAHA WR 450F 2008  Owners Manual 3-28
ELECTRICAL
3. Remove:
• Battery band
•Battery
4. Measure:
• Battery charge
Measurement steps:
a. Connect a pocket tester "1" to the 
battery terminals.
• The charge state of an MF battery

Page 84 of 224

YAMAHA WR 450F 2008  Owners Manual 3-29
ELECTRICAL
Charging method using a variable voltage charger

Page 85 of 224

YAMAHA WR 450F 2008  Owners Manual 3-30
ELECTRICAL
Charging method using a constant voltage charger

Page 197 of 224

YAMAHA WR 450F 2008  Owners Manual 6-36
REAR SHOCK ABSORBER
REAR SHOCK ABSORBER
REMOVING THE REAR SHOCK ABSORBER
Order Part name Qty Remarks
Hold the machine by placing the suitable stand 
under the engine.Refer to "HANDLING NOTE".
Se

Page 204 of 224

YAMAHA WR 450F 2008  Owners Manual 7-3
IGNITION SYSTEM
IGNITION SYSTEM
INSPECTION STEPS
Use the following steps for checking the possibility of the malfunctioning engine being attributable to ignition system failure 
and for checking t
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