2008 Yamaha WR450F(X) Owner's Service Manual
WR450F(X) / WR450FX / WR450F service manual covers engine, chassis, electrical systems. Complete maintenance, adjustment, and repair procedures with specifications, torque values, and troubleshooting guides.
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Models Covered & Key Technical Specifications
Yamaha WR450F(X), WR450FX, WR450F — 2008 Detailed Reference Manual | WR450F Series Division.
- Prescribed Securement Values: 449 cm³ (15.8 Imp oz) is established at the engine cylinder volume Architecture.
- Documented Fluid Capacity: For optimal performance, 8.0 L (2.11 US gal) is standardized to the fuel tank specification Protocol.
- Core Gap Specs: The valve clearance reaches 0.10–0.15 mm (intake) and 0.20–0.25 mm (exhaust) when cold Norms.
- Rated Power Draw: 112.5 kg (248.0 lb) — dictates the dry weight without oil and fuel Bounds.
- Technical Print Rate: Maximum engine speed specifies 3,200 r/min for optimal operation Topology.
- Advanced Tension Specs: Compression ratio represents 12.3 : 1 for standard combustion chamber pressure standards Margin.
Professional Workshop Service Manual & Technical Specifications
Complete Technical Training Manual: Motorcycle Yamaha WR450F(X) WR450FX WR450F Off-Road Motorcycle 2008 - Complete Owner's Service Manual & Maintenance Guide Electrical-Reference
Model-Specs: 2008 Yamaha WR450F, WR450FX, WR450F(X) // Repair-Classification: Off-Road Motorcycle Service Documentation / Single-Cylinder Four-Stroke Engine System Logic // Model-Specs: 224-page comprehensive factory service reference with electrical schematics and component specifications.
| Chapter Reference | Content Coverage | Documentation Level |
|---|---|---|
| General Information | Machine identification, controls, multi-function display operation, break-in procedures | Complete specifications provided |
| Specifications | General specs, maintenance intervals, tightening torques, lubrication diagrams, cable routing | Comprehensive data tables included |
| Regular Inspection and Adjustments | Pre-operation checks, engine, chassis, electrical systems, troubleshooting matrix | See Chapter 3 procedures |
Organized into dedicated modules for engine systems, chassis mechanics, electrical architecture, and maintenance sequence. The manual features camshaft timing documentation, radiator and cooling system procedures, carburetor setting guidance, transmission and shift mechanism reference, and front/rear suspension tuning parameters. Covers brake system hydraulic procedures, ignition timing verification methods, charging and starting system diagnostics, and throttle position sensor calibration techniques. Includes detailed wiring diagrams, component inspection criteria, and bearing/seal replacement protocols.
Systematic Topology
This manual documents engine and transmission systems including DOHC valve operation, timing chain tensioning, and clutch assembly configuration. The document provides detailed reference information for the FCR-MX39 carburetor, fuel system architecture, and air induction valve operation. Lubrication system documentation encompasses oil pump operation, filter element maintenance, and crankshaft bearing specifications. Cooling system reference data includes radiator specifications, water pump assembly, and thermal management procedures.
Integrated Interface
Chassis documentation covers front fork suspension geometry, damping force adjustment data, and rebound spring tuning parameters. Rear suspension reference includes shock absorber preload adjustment, compression and rebound damping controls, and swingarm linkage assembly. Brake system procedures are documented for hydraulic fluid management, caliper piston operation, and disc brake pad replacement protocols. Steering system documentation includes bearing adjustment procedures and handlebar mounting specifications.
Core Threshold
Electrical systems documentation encompasses ignition system architecture with CDI unit operation, AC magneto stator configuration, and ignition coil specifications. Electric starting system procedures document starter motor disassembly, solenoid relay operation, and starting circuit cut-off relay function. Charging system reference covers rectifier/regulator voltage output and AC magneto charging coil resistance data. The manual documents torque specifications for crankshaft installation, engine mounting brackets, and frame attachment points to ensure proper assembly stress control.
Integrated Protocol
Wheel and tire documentation includes spoke tension reference, bearing installation procedures, and disc brake assembly specifications. Drive chain reference data covers slack adjustment parameters, O-ring maintenance, and sprocket tooth inspection criteria. Transmission documentation provides gear ratio specifications, shift fork wear limits, and ratchet wheel engagement procedures. Fuel system documentation encompasses carburetor jet needle positioning, accelerator pump timing adjustment, and float height measurement protocols.
Operational Framework
The document includes comprehensive troubleshooting matrices for ignition system diagnostics, starting system verification, and charging system inspection procedures. Multi-function display operation is documented with timer measurement functions, odometer reset procedures, and speedometer unit conversion reference. Maintenance interval schedules are provided indicating service requirements following break-in operation, race preparation, and periodic maintenance cycles. Component specification tables list valve clearance dimensions, spark plug gap parameters, and brake fluid specifications for reference during service operations.
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