🏷️ Basic Information Identification Make: Yamaha Model: WR426 Product Name: Yamaha WR426 2000-2008 WSM Service Manual Repair Product Description: This is a full professional quality in-depth Service Repair Manual Download for the Yamaha WR426 covering model years 2000 through 2008. It provides easy-to-follow step-by-step instructions, pictures, and wiring diagrams for all areas of repair and routine maintenance. Codes Model Code: WR426F (specific chassis codes may vary by year and region, consult manual for VIN decoding) Engine Code: 426cc Four-Stroke Single-Cylinder (specific engine codes may vary, consult manual for exact designations) 👋 Introduction Market Position Category: Off-road motorcycle (Enduro/Motocross) Purpose: Designed for competitive off-road riding and recreational trail use. Competitive Analysis Competitors: Honda CR250/CRF450R, Kawasaki KX250/KX450F, Suzuki RM250/RM-Z450, KTM EXC series (at the time of production). Key Features Engine Type: High-performance 4-stroke single-cylinder engine, known for strong torque and power delivery. Suspension: Advanced, long-travel adjustable suspension systems, typically KYB components, providing excellent off-road capability. Frame: Lightweight and rigid chassis designed for agility and stability. Value Proposition Diy Savings: Enables owners to perform their own repairs and maintenance, saving significant costs on labor. Knowledge Gain: Empowers owners with the knowledge to understand and repair their vehicle, increasing self-reliance. 📋 Manual Details Coverage Areas Model Years Covered: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Geographic Coverage: Likely global, but specific regional variations may exist. Manual covers general service procedures applicable across markets. Page Count Estimated Page Count: Likely extensive, typical for a full service manual (estimated 500+ pages, actual count not specified but implied to be comprehensive). Manual Type Type: Workshop Service Manual (WSM) / Service Repair Manual Language Language: English Format Format: PDF Download Delivery Method: Instant Download Requirements Software Requirements: Adobe PDF Reader Operating System Compatibility: All Versions of Windows & Mac 📖 Manual Coverage Systems Covered Engine Mechanical: Complete overhaul, including cylinder head, piston, connecting rod, crankshaft, valve train, lubrication system, cooling system. Engine Fuel System: Carburetor tuning, cleaning, and rebuilding (likely Mikuni VM-series or similar), fuel pump, fuel lines. Engine Ignition System: CDI system, ignition coil, spark plug specifications, timing adjustments. Transmission And Drivetrain: Clutch operation, gear shifting mechanisms, internal transmission components, final drive (chain and sprockets). Suspension System: Front forks (KYB SSS or similar), rear shock absorber (Monoshock), linkage, springs, damping adjustments, oil specifications. Braking System: Front and rear hydraulic disc brakes, caliper service, master cylinder overhaul, brake fluid specifications and bleeding procedures. Electrical System: Wiring diagrams, lighting system, battery maintenance, stator and regulator/rectifier checks. Chassis And Frame: Frame inspection, steering head bearing service, swingarm maintenance. Bodywork And Plastic: Removal and installation of body panels, seat, fuel tank. Procedures Included Routine Maintenance: Oil changes, filter replacements, chain adjustment, air filter cleaning, spark plug checks, bolt torque checks. Troubleshooting: Diagnostic guides for common performance issues, starting problems, electrical faults. Repair And Rebuild: Detailed step-by-step instructions for engine disassembly, component replacement, and reassembly. Performance Tuning: Carburetor jetting recommendations, suspension setup advice. Wiring Diagrams: Full electrical system schematics for troubleshooting and repairs. Technical Depth Depth: Comprehensive, covering from basic maintenance to full engine and suspension rebuilds. Professional quality for DIY mechanics and experienced technicians. 📊 Manual Specifications File Format Format: PDF Searchable: Implied by PDF format, allowing for keyword searching. Print Quality Printability: Full Printable Resolution: Professional quality, ensuring clarity of text, diagrams, and images. Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: 4-stroke, liquid-cooled, DOHC, single-cylinder Displacement: 426 cc (26.0 cu. in.) Bore X Stroke: Approx. 95.0 mm x 60.0 mm (specific values may vary slightly, consult manual) Compression Ratio: Typically around 12.5:1 (specific value for WR426F variant should be confirmed in manual) Performance Horsepower: Estimated 45-50 HP (peak figures vary, exact dyno figures not provided in product info) Torque: Strong mid-range and top-end torque characteristic of 4-stroke off-road bikes. Fuel System Carburetor: Likely Mikuni VM38 or similar flat-slide carburetor (specific model to be confirmed in manual). Fuel Type: Unleaded gasoline (octane rating to be specified in manual, typically 91+RON or 87+AKI). Lubrication Oil Type: Yamaha's recommended motorcycle-specific 4-stroke engine oil. SAE 10W-40 or 20W-50 typically recommended based on climate. Consult manual for precise viscosity. Oil Capacity: Approx. 1.0 - 1.2 liters (including filter replacement). Consult manual for exact capacity with and without filter change. 🔧 Transmission Standard Type: Constant-mesh 5-speed sequential gearbox. Clutch: Wet, multi-plate, cable-actuated clutch. Features Gear Ratios: Specific gear ratios are detailed in the manual for each gear. Final Drive: O-ring sealed chain, requiring regular lubrication and adjustment. Specific sprocket ratios (e.g., 13T front, 52T rear) are common for this model and detailed in the manual. 📐 Dimensions Exterior Wheelbase: Approx. 1475 mm (58.1 in.) - specific to model year. Ground Clearance: Approx. 330 mm (13.0 in.) or more, designed for off-road obstacles. Weights Dry Weight: Approx. 110-115 kg (242-254 lbs) -...