2009 YAMAHA WR 450F wheel size

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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 36 of 226

YAMAHA WR 450F 2009  Owners Manual 2-9
MAINTENANCE SPECIFICATIONS
CHASSIS
Item Standard Limit
Steering system:
Steering bearing typeTaper roller bearing ----
Front  suspension: USA,  CDN EUROPE, AUS, NZ, ZA 
Front fork travel 300 mm (1

Page 40 of 226

YAMAHA WR 450F 2009  Owners Manual 2-13
TIGHTENING TORQUES
Radiator pipe 1, 2 M10 × 1.0 2 10 1.0 7.2
Impeller M8 × 1.25 1 14 1.4 10
Water pump housing cover M6 × 1.0 3 10 1.0 7.2
Coolant drain bolt M6 × 1.0 1 10 1.0 7.2
Oil pump co

Page 41 of 226

YAMAHA WR 450F 2009  Owners Manual 2-14
TIGHTENING TORQUES
CHASSIS
△- marked portion shall be checked for torque tightening after break-in or before each race.
Part to be tightened Thread size QtyTightening torque
Nm m•kg ft•lb

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 94 of 226

YAMAHA WR 450F 2009  Owners Manual 4-5
CHASSIS
CHASSIS
SELECTION OF THE SECONDARY 
REDUCTION RATIO (SPROCKET)
<Requirement for selection of sec-
ondary gear reduction ratio>
• It is generally said that the second-
ary gear ratio shou