2009 YAMAHA WR 450F light

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Page 30 of 226

YAMAHA WR 450F 2009  Owners Manual 2-3
MAINTENANCE SPECIFICATIONS
MAINTENANCE SPECIFICATIONS
ENGINETire:
Type With tube
Size (front) 80/100-21 51M (USA, CDN, ZA)
90/90-21 54R (EUROPE, AUS, NZ)
Size (rear) 110/100-18 64M (USA, CDN, ZA)

Page 38 of 226

YAMAHA WR 450F 2009  Owners Manual 2-11
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 42 of 226

YAMAHA WR 450F 2009  Owners Manual 2-15
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 43 of 226

YAMAHA WR 450F 2009  Owners Manual 2-16
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 49 of 226

YAMAHA WR 450F 2009  Owners Manual 2-21
CABLE ROUTING DIAGRAM
A. Insert the end of the fuel tank 
breather hose into the hole in 
the steering stem.
B. Fasten the throttle cable, hot 
starter cable and rectifier/regula-
tor lead onto t

Page 51 of 226

YAMAHA WR 450F 2009  Owners Manual 2-23
CABLE ROUTING DIAGRAM
1. Brake master cylinder
2. Brake hose holder
3. Brake hoseA. Install the brake hose so that its 
pipe portion directs as shown 
and lightly touches the projec-
tion on the

Page 52 of 226

YAMAHA WR 450F 2009  Owners Manual 2-24
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 226

YAMAHA WR 450F 2009  Owners Manual 2-25
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
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