2005-2006 Yamaha WR450F(T) Service Manual
Complete maintenance and repair guide for the WR450F and WR450F(T) motorcycles. Covers engine, chassis, electrical system, and periodic service intervals with precise specifications and torque settings.
Yamaha Models Covered & Key Technical Specifications
Models: Yamaha WR450F(T)
Sub-models / Variants: WR450FT (USA, CDN, AUS, NZ), WR450F (EUROPE, ZA)
Model Years: 2005–2006
Serial Numbers: 5TJ8 (USA), 5TJ9 (EUROPE), 5TJA (CDN, AUS, NZ, ZA)
Technical Data:
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Engine type: Liquid cooled 4-stroke, DOHC
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Displacement: 449 cm³ (15.8 Imp oz, 15.2 US oz)
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Bore × stroke: 95.0 × 63.4 mm (3.74 × 2.50 in)
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Compression ratio: 12.3:1
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Dry weight: 112.5 kg (248 lb)
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Starting system: Kick and electric starter
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Fuel capacity: 8.0 L (1.76 Imp gal, 2.11 US gal)
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Transmission: 5-speed constant-mesh
Yamaha Manual Features & Content Preview
2005–2006 Yamaha WR450F Workshop Manual
- Covers 2005–2006 Yamaha WR450F(T) motocross motorcycles, including the 5TJ8, 5TJ9, and 5TJA model variants across all global specifications
- Official OEM publication 5TJ-28199-42 (First edition, August 2004)
- Contains 758 pages of technical data, exploded-view diagrams, maintenance schedules, and electrical schematics
- Delivered as an instant download right after checkout—get to work immediately
- Fully indexed PDF with an OCR text layer so you can quickly search for specific torque specs or part references
- Acts as the definitive technical reference for the 5TJ-series engine architecture, detailing exact bore sizes, valve clearances, and factory assembly parameters
Technical Scope and Documentation
This official manual delivers a complete technical breakdown of the WR450F. You get immediate access via instant download, letting you pull up the exact factory specifications on your phone, tablet, or laptop right in the garage. The documentation covers all major systems on the bike. It details the structural design of the high-compression liquid-cooled DOHC engine, the 5-speed transmission, and the lightweight double-cradle chassis. You will also find comprehensive chapters outlining camshaft timing, cylinder head assembly, and the specialized carburetor system—including accelerator pump settings and jetting tables. For electrical troubleshooting, the guide maps out the map-controlled CDI unit and charging system parameters.
Specification Highlights and Reference Data
Having exact measurements is critical for tolerance checking and service-limit verification. The guide specifies a cylinder head warp limit of 0.05 mm and details precise piston-to-cylinder clearance standards of 0.040–0.065 mm. Intake valve clearances are listed directly in the specification tables at 0.10–0.15 mm, alongside a required spark plug gap of 0.7–0.8 mm. You will also find full specs for the dry-
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