This manual covers the Yamaha WR400F, a versatile off-road motorcycle produced from 2000 through 2008. Known for its robust four-stroke, liquid-cooled, 396cc engine featuring a 5-valve DOHC design, the WR400F delivers a potent blend of motocross power and enduro capability. Its engineering emphasizes reliability and performance, making it a favored choice for enthusiasts and competitors in various off-road disciplines. The model's design incorporates advanced suspension systems, including front forks and a rear shock, along with a powerful braking system and a durable chassis, all contributing to its strong reputation in the off-road community. This comprehensive service repair workshop manual provides detailed guidance for owners, mechanics, and technicians. It encompasses a wide range of essential information, including routine maintenance procedures, periodic checks and adjustments, in-depth troubleshooting guides, and complete repair and rebuild instructions for all major systems. Key areas covered include the engine, fuel system, cooling system, transmission, electrical system, suspension, brakes, and bodywork. With clear text, diagrams, illustrations, and wiring schematics, this manual is designed to facilitate efficient maintenance and repair, ensuring the optimal performance and longevity of your Yamaha WR400F. 🏷️ Basic Information Identification Make: Yamaha Model: WR400F Model Variant: WR400 Years Covered: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Codes Engine Code Range: Likely to cover 4BF engine designation (specific code varies by year and market, but the WR400F engine family is consistent) Chassis Code Range: Likely to cover 5TJ, 5VK, and related chassis designations (specific code varies by year and market) 👋 Introduction Market Position Target Audience: Yamaha WR400F owners with basic mechanical skills, independent repair professionals, and enthusiasts seeking detailed maintenance and repair knowledge. Competitive Analysis Comparison To Dealer Manuals: Contains the same specifications and procedures used by authorized Yamaha dealer service departments. Key Features Content Highlights: Step-by-step instructions, diagrams, illustrations, wiring schematics, comprehensive specifications. Value Proposition Cost Savings: Enables owners to perform routine maintenance and repairs, saving significant money on labor costs. Usability Accessibility: Viewable on PC, Mac, and many mobile devices; printable pages for garage use. 📋 Manual Details Coverage Areas Primary Coverage: Service, Repair, Workshop, Troubleshooting Secondary Coverage: Routine Maintenance, Periodic Checks and Adjustments, Specifications, Wiring Diagrams Page Count Estimated Page Count: While not explicitly stated, professional workshop manuals of this scope typically range from 300 to 800+ pages depending on the depth of detail. Manual Type Type: Service Repair Workshop Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Engine specifications, engine removal/installation, top-end overhaul (cylinder, piston, valves), bottom-end overhaul (crankshaft, connecting rod, bearings), timing system, lubrication system. Fuel System: Carburetor (Mikuni BDSR40/BDSR39 for most years), fuel pump, fuel lines, fuel tank, fuel filter replacement. Cooling System: Radiator, coolant hoses, water pump, thermostat, coolant specifications and capacity. Transmission Drivetrain: Transmission internals, gear selection, clutch operation, drive chain maintenance, sprocket replacement, lubrication. Electrical System: Ignition system, lighting, charging system (stator, rectifier/regulator), battery, starter motor, wiring harnesses, electrical component testing. Suspension Steering: Front forks (KYB USD, including damping and spring adjustments), rear shock absorber (KYB, including spring preload and damping adjustments), steering head bearings, linkage systems. Brakes: Front and rear brake caliper service, master cylinder overhaul, brake fluid replacement, pad wear inspection, rotor condition. Bodywork Chassis: Frame inspection, plastic component removal/installation, seat, fuel tank, fenders, exhaust system. Procedures Included Maintenance: Routine maintenance (oil changes, filter replacements, chain adjustment), periodic checks, lubrication schedules. Troubleshooting: Diagnostic procedures for common and advanced issues, symptom-based troubleshooting guides. Repair Rebuild: Step-by-step instructions for component disassembly, repair, and reassembly of major systems. Adjustments: Carburetor adjustment, suspension tuning, clutch and brake lever adjustments, idle speed settings. Wiring Diagrams: Detailed wiring schematics for electrical components and systems. Technical Depth Depth: Comprehensive, covering from basic maintenance to complete engine and transmission rebuilds, including electrical diagnostics. 📊 Manual Specifications File Format File Format: PDF Print Quality Printability: Printable (individual pages can be printed) Readability: Clear and concise text with diagrams and illustrations. Binding Type Binding Type: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Type: Four-stroke, Liquid-cooled, DOHC, 5-valve, Single-cylinder Displacement: 396cc Bore X Stroke: 81.0 mm x 77.0 mm Compression Ratio: Approximately 12.0:1 (subject to minor variations by year) Performance Horsepower: Around 45-50 HP (estimated, not explicitly stated in product info) Torque: Around 35-40 Nm (estimated, not explicitly stated in product info) Fuel System Carburetor Type: Mikuni BDSR40/BDSR39 (likely, depending on specific year/market) Fuel Type: Unleaded gasoline Lubrication Oil Type: Yamalube 4 (or equivalent API SG, SAE 10W-30, 15W-40, or 20W-50 viscosity recommended based on temperature) Oil Capacity: Approximately 1.75 Liters (with filter change, subject to variation by year) 🔧 Transmission Standard Transmission Type: Constant mesh, 5-speed Clutch Type: Wet, multi-plate Optional Optional Transmission Types: N/A (standard for this model) Features Gear Ratios: Specific gear ratios will be detailed within the manual. Transmission Fluid: Yamaha Gear Oil...