2008 Yamaha WR450F(X) / WR450FX / WR450F Owner's Service Manual
Yamaha Models Covered & Key Technical Specifications
Models: Yamaha WR450F(X), WR450FX, WR450F
Sub-models / Variants: CDN (Canada), AUS (Australia), NZ (New Zealand), ZA (South Africa)
Model Years: 2008
Technical Data:
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Engine type: Liquid cooled 4-stroke, DOHC
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Displacement: 449 cm³
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Compression ratio: 12.3 : 1
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Bore × stroke: 95.0 × 63.4 mm
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Transmission: Constant mesh, 5-speed
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Clutch type: Wet, multiple-disc
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Carburetor type: FCR-MX39
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Dry weight: 112.5 kg (248.0 lb)
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Fuel tank capacity: 8.0 L (2.11 US gal)
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Engine idle speed: 1,750–1,950 r/min
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Valve clearance (cold) Intake: 0.10–0.15 mm
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Valve clearance (cold) Exhaust: 0.20–0.25 mm
Yamaha Manual Features & Content Preview
This factory-authorized publication (P/N 5TJ-28199-71, first edition June 2007) provides the definitive technical baseline for the 2008 Yamaha WR450F and WR450FX. Designed for professional mechanics and dedicated do-it-yourselfers, this 220-page guide details comprehensive maintenance, inspection, and tuning procedures for the high-performance motocross machine.
Component Coverage and Technical Scope
The manual thoroughly documents all engine and chassis systems. It includes precise tuning parameters for the FCR-MX39 carburetor, cylinder head overhauls, valvetrain servicing, and transmission maintenance. Chassis sections cover the semi-double cradle frame, link-type monoshock suspension, and the front and rear hydraulic disc brakes.
You will find strict component wear limits essential for proper performance. Working on high-performance, liquid-cooled engines and specialized suspension systems requires strict adherence to these factory-specified torque values and inspection thresholds to ensure reliable and safe operation.
Critical Specifications Included
The documentation provides exact figures for the 5TJ-series build, detailing necessary data such as:
- Engine Specs: 12.3:1 compression ratio (liquid-cooled DOHC) and a 1.0-liter coolant capacity.
- Clearances & Limits: Intake valve clearance (0.10–0.15 mm) and precise piston ring end gaps.
- Suspension: Front fork oil level (set to 132 mm for Canadian units).
- Fuel & Electrical: Standard #162 main jet calibration, CDI unit diagnostics, precise stator output values, and charging system circuits.
Format and Usability
- Instant Access: Delivered as a direct download immediately upon payment clearance.
- Fully Searchable: The indexed PDF allows you to instantly locate any chapter, appendix, or specification.
- Garage-Ready: No DRM restrictions on printing. Print out specific exploded-view diagrams, torque tables, or cable routing schematics directly for the workbench without ruining a physical book.
- Secure Storage: The file is backed up to your account for easy retrieval in the event of a hard-drive failure.
- Market Coverage: Includes specific data and cable routing diagrams for Canadian, Australian, New Zealand, and South African market variants.
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