The Yamaha WR400F, produced from 2000 to 2008, is a competition-focused four-stroke off-road motorcycle renowned for its potent engine and robust performance in motocross and enduro riding. Building on Yamaha's extensive heritage in off-road racing, the WR400F was engineered with a liquid-cooled 396cc engine, typically producing around 40-45 horsepower, and a 5-speed transmission, optimized for versatile off-road conditions. Its design emphasizes reliability and capability, positioning it as a strong contender against key competitors of its era, such as models from KTM, Honda, Kawasaki, and Suzuki. The motorcycle features hydraulic disc brakes for effective stopping power and a steel semi-double cradle frame for structural integrity, with a seat height around 38 inches and substantial ground clearance for navigating challenging terrain. This workshop repair service manual provides comprehensive, professional-level diagnostic, repair, and maintenance information for all WR400F models across its production years. It covers a wide array of systems, including the fuel, cooling, engine top end, clutch, lubrication, transmission, wheels, tires, brakes, suspension, steering, frame, and electrical systems. Detailed procedures for service, maintenance, troubleshooting, disassembly, assembly, cleaning, and reinstallation are included, alongside critical specifications, diagnostic information, and wiring diagrams. This manual is an essential resource for DIY mechanics and professional technicians, enabling accurate upkeep and cost-effective repairs, ensuring the optimal performance and longevity of the Yamaha WR400F. 🏷️ Basic Information Identification Make: Yamaha Model: WR400F Model Designation: WR400 Years Covered: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Codes Engine Code Identifier: Likely a 4SP designation for 4-stroke, specific engine code not provided but consistent across years for this model line Chassis Code Identifier: Specific chassis codes vary by year and region but the manual covers the WR400F platform across this range 👋 Introduction Market Position Vehicle Type: Competition Motocross/Enduro Motorcycle Competitive Analysis Key Competitors Era: KTM EXC, Honda CR, Kawasaki KX, Suzuki RM Key Features Manual Value Proposition: Comprehensive, accurate, and detailed technical information for DIY mechanics and professional technicians, enabling cost savings on repairs and maintenance. Digital Manual Advantage: No risk of damage from oil/dirt, ability to print specific sections, instant access Manual Completeness Assurance: Guaranteed to be complete and intact, without missing or corrupt parts/pages. 📋 Manual Details Coverage Areas Coverage Scope: All Models, All Engines, All Trim Types, All Transmission Types Page Count Estimated Page Count: Hundreds of pages (as stated in product description) Manual Type Type: Workshop Repair Service Manual Origin Of Manual: OEM (Original Equipment Manufacturer) equivalent, same manual used in official service/repair shops. Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Covered Systems: General Information, Fuel System, Cooling System, Engine Top End, Clutch, Engine Lubrication System, Engine Removal/Installation, Crankshaft/Transmission, Wheels/Tires, Final Drive, Brakes, Suspension, Steering, Frame, Electrical System, Appendix Electrical System Detail: Includes detailed wiring diagrams, troubleshooting for ignition, lighting, and charging systems. Suspension Details: Covers front forks (likely upside-down telescopic) and rear monoshock suspension, including adjustment and maintenance. Brake System Details: Detailed information on hydraulic brake system components, including fluid replacement, caliper service, and pad replacement. Wheel Tire Final Drive Details: Includes information on wheel bearing maintenance, tire pressure, and chain drive adjustment/lubrication. Procedures Included Included Procedures: Service, Maintenance, Troubleshooting, Repair, Disassembly, Assembly, Cleaning, Reinstalling Procedures, Diagnostic information, Electrical service procedures, Wiring diagrams Engine Rebuild Procedures: Complete procedures for engine top-end rebuild, crankshaft and transmission disassembly/assembly. Troubleshooting Electrical: Specific troubleshooting guides for electrical system faults, often integrated with wiring diagrams. Technical Depth Depth Of Information: Professional-level diagnostic, repair, and maintenance information as used by local service/repair shops; detailed substeps, critical specifications, critical information (notes, cautions, warnings) Diagnostic Capabilities: Comprehensive diagnostics for all major systems, including specific procedures for identifying and resolving faults. 📊 Manual Specifications File Format File Format Details: PDF Searchability: PDF format typically allows for text searching, enhancing usability for finding specific information quickly. Print Quality Printability: Full Printable Zoom Functionality Zoom Capability: YES Delivery Method Delivery: Instant Download Software Requirements Requirements: Adobe PDF Reader, WinZip Compatibility Operating Systems: All Versions of Windows & Mac ⚙️ Engine Specifications Primary Engine Engine Type: 4-Stroke Engine Displacement: Approximately 396cc (specific bore/stroke not provided, but characteristic of WR400F) Engine Bore Stroke Typical: Typical bore around 84mm and stroke around 70mm for this displacement. Performance Horsepower Estimated: Likely in the 40-45 HP range (typical for this class and era) Torque Estimated: Not specified, but optimized for off-road usability Fuel System Fuel Delivery: Carbureted (likely Mikuni VM series, specific model not provided) Carburetor Considerations: Manual likely details specific carburetor tuning, jetting, and cleaning procedures. Cooling System Cooling Method: Liquid-Cooled 🔧 Transmission Standard Transmission Type: 5-speed constant mesh Optional Optional Transmissions: N/A (standard for this model) Features Clutch Type: Wet, multi-plate 📐 Dimensions Exterior Wheelbase: Varies slightly by year, typically around 1475-1485 mm (58.1-58.5 inches) Ground Clearance: Typically around 330-345 mm (13-13.6 inches) Seat Height: Approximately 960-970 mm (37.8-38.2 inches) Weights Dry Weight:...