2008 YAMAHA WR 450F relay

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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 43 of 224

YAMAHA WR 450F 2008  Owners Manual 2-16
TIGHTENING TORQUES
△Driven sprocket and wheel hub  M8 × 1.25 6 50 5.0 36
△Nipple (spoke) — 72 3 0.3 2.2
△Disc cover and rear brake caliper M6 × 1.0 2 10 1.0 7.2
△Protector and rear br

Page 44 of 224

YAMAHA WR 450F 2008  Owners Manual 2-17
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 52 of 224

YAMAHA WR 450F 2008  Owners Manual 2-25
CABLE ROUTING DIAGRAM
1. Clamp
2. Positive battery lead
3. Battery
4. Negative battery lead
5. Taillight coupler
6. CDI unit coupler (6-pin)
7. CDI unit coupler (3-pin)
8. CDI unit coupler (6-pin

Page 53 of 224

YAMAHA WR 450F 2008  Owners Manual 2-26
CABLE ROUTING DIAGRAM
E. Connect the wire harness to the 
starter relay.
F. Fasten the catch tank breather 
hose and catch tank hose to the 
rear frame. Clamp them close to 
where they are joined

Page 58 of 224

YAMAHA WR 450F 2008  Owners Manual 3-3
MAINTENANCE INTERVALS
FUEL TANK, COCK
Clean and inspect●●
BRAKES
Adjust lever position and pedal 
height●●
Lubricate pivot point●●
Check brake disc surface●●
Check fluid level and

Page 192 of 224

YAMAHA WR 450F 2008  Owners Manual 6-31
SWINGARM
SWINGARM
REMOVING THE SWINGARM
Order Part name Qty Remarks
Hold the machine by placing the suitable stand 
under the engine.Refer to "HANDLING NOTE".
Brake hose holder Refer to "FRONT B

Page 193 of 224

YAMAHA WR 450F 2008  Owners Manual 6-32
SWINGARM
DISASSEMBLING THE SWINGARM
Order Part name Qty Remarks
1 Cap 2 Refer to removal section.
2 Relay arm 1
3 Connecting rod 1
4 Collar 2
5 Oil seal 2
6 Thrust bearing 2
7 Bushing 2
8 Oil se
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