Owner and Service Manual Review

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The following service manual applies for 2007 Yamaha WR450FW motocross series. Herein you will find detail information on detail description of the motorcycle, machine identification location, control function, starting and break in, torque check points, cleaning and storage, specification, regular inspection and adjustment (covers maintenance interval, maintenance on engine, chassis and electrical system), engine system, chassis, electrical system and wiring diagram, tuning.

General Specification
Model name: WR450FW

Dimensions
Overall length: 2,175 mm (85.63 in)
Overall width: 825 mm (32.48 in)
Overall height: 1,295 mm (50.98 in)
Seat height: 980 mm (38.58 in)
Wheelbase: 1,485 mm (58.46 in)
Minimum ground clearance: 365 mm (14.37 in)
Dry weight (Without oil and fuel): 112.5 kg (248.0 lb)

Engine
Engine type: Liquid cooled 4-stroke, DOHC
Cylinder arrangement: Single cylinder, forward inclined
Displacement: 449 cm3 (15.8 Imp oz, 15.2 US oz)
Bore × stroke: 95.0 × 63.4 mm (3.74 × 2.50 in)
Compression ratio: 12.3 : 1
Starting system: Kick and electric starter
Lubrication system: Dry sump
Carburetor type/manufacturer: FCR MX39/ KEIHIN
Spark plug type/manufacturer: CR8E/NGK (resistance type)
Spark plug gap 0.7 ~ 0.8 mm (0.028 ~ 0.031 in)
Clutch type: Wet, multiple-disc

Transmission
Primary reduction system: Gear
Primary reduction ratio: 61/23 (2.652)
Secondary reduction system: Chain drive
Secondary reduction ratio: 50/13 (3.846)
Transmission type: Constant mesh, 5-speed
Operation: Left foot operation
Gear ratio:
1st: 29/12 (2.417)
2nd: 26/15 (1.733)
3rd: 21/16 (1.313)
4th: 21/20 (1.050)
5th 21/25 (0.840)
Frame type: Semi double cradle
Caster angle: 27.3° 27.0°
Trail: 117 mm (4.61 in)

Find the detail information of 2007 Yamaha WR450FW here (794 pages of pdf file docs.)

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