The WR400F, produced from 2000 to 2008, is a performance-oriented enduro motorcycle renowned for its robust 400cc four-stroke engine. This model represents a commitment to delivering capable off-road machines, building on a strong heritage in motocross and off-road racing. Its engineering prioritizes reliability and power, making it a favored choice for riders seeking a potent and dependable machine for demanding terrain. The WR400F is characterized by its liquid-cooled, DOHC, 5-valve engine configuration, delivering an estimated 40-45 horsepower and a torque output of 35-38 Nm, ensuring strong performance across various off-road conditions. This comprehensive Workshop Service Manual provides essential technical information for the maintenance, repair, and overhaul of the WR400F. Covering all aspects from routine maintenance procedures like oil changes and filter replacements to complex engine and transmission rebuilds, this manual is an invaluable resource. It includes detailed instructions for disassembly, assembly, diagnostic troubleshooting, and component repair, ensuring that owners and technicians can accurately maintain and restore the vehicle to optimal performance. The manual emphasizes safety, providing critical warnings and notes to guide users through procedures with precision. 🏷️ Basic Information Identification Make: Yamaha Model: WR400F Model Variant: WR400 Production Years Covered: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Codes Engine Code General: 400cc Single-Cylinder, Four-Stroke 👋 Introduction Market Position Positioning: Essential technical resource for owners and technicians seeking to perform maintenance and repairs on the Yamaha WR400F. Competitive Analysis Value Proposition: Provides dealership-level information, enabling cost savings and informed DIY repairs, replicating the expertise found in authorized service centers. Key Features Unique Selling Points: Comprehensive coverage, detailed procedures, inclusion of proprietary component information, and emphasis on safety and accuracy. 📋 Manual Details Coverage Areas Primary Coverage: Repair and overhaul of Yamaha WR400F models Additional Coverage: Proprietary component repair instructions Page Count Total Pages: 771 Manual Type Type: Workshop Service Manual Language Language: English Format Digital Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Complete overhaul and repair procedures Transmission: Complete disassembly and assembly procedures Fuel System: Detailed diagnosis and repair of fuel delivery and control Ignition System: Ignition timing, component testing, and troubleshooting Lubrication System: Lubrication schedules, component inspection, and repair Exhaust System: Repair and maintenance of exhaust components Electrical System: Wiring diagrams, component testing, and troubleshooting Body: Body panel repair, fitment, and component replacement Procedures Included Routine Maintenance: Tune-ups, oil changes, filter replacements Removal Installation: Step-by-step guides for component removal and installation Assembly Disassembly: Detailed instructions for dismantling and reassembling major components Diagnostic Troubleshooting: Procedures for identifying and resolving faults Proprietary Component Repair: Guidance for specific branded parts Technical Depth Depth: Comprehensive (from routine maintenance to full engine/transmission rebuilds) Target Audience Intended User: Mechanical Technicians familiar with BRP products and general automotive practices 📊 Manual Specifications File Format Format: PDF Print Quality Printability: Yes (Printable) Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) Delivery Delivery Method: Fast and Free Electronic Delivery via Email ⚙️ Engine Specifications Primary Engine Engine Type: Liquid-cooled, 4-stroke, DOHC, 5-valve Displacement: 399cc (Exact displacement may vary slightly by sub-model or tuning) Bore X Stroke: 84.0 mm x 72.0 mm (Typical for this generation) Compression Ratio: 11.4:1 (Typical) Performance Horsepower: Estimated 40-45 HP (At crankshaft, depending on tuning and exhaust) Torque: Estimated 35-38 Nm (At crankshaft, depending on tuning and exhaust) Fuel System Carburetor: Mikuni BSR38 (Typical, may vary by specific market or model year) Fuel Type: Unleaded gasoline (Octane rating specified in manual) Ignition Ignition System Type: TCI (Transistor Controlled Ignition) 🔧 Transmission Standard Type: Constant mesh, 5-speed sequential Features Clutch Type: Wet, multi-plate Drive Type: Chain drive 📐 Dimensions Exterior Length: Approx. 2,200 mm (Varies by model year) Width: Approx. 820 mm (Varies by model year) Height: Approx. 1,250 mm (Varies by model year) Weights Dry Weight: Approx. 118 kg (Varies by model year) Wet Weight: Approx. 125 kg (Varies by model year, with all fluids) Wheels Tires Front Tire Size: 80/100-21 (Typical, check manual for specifics) Rear Tire Size: 110/90-18 (Typical, check manual for specifics) 🛡️ Safety Features Ratings Safety Features Emphasis: Manual stresses use of safety equipment and adherence to precautions. Active Features Braking System: Hydraulic disc brakes, front and rear Passive Features Warning Symbols: Highlights WARNING, CAUTION, and NOTE designations for critical information. 💡 Technology Features Infotainment Features: N/A (This is a performance off-road motorcycle, not equipped with typical infotainment systems). Driver Assistance Features: N/A (Focus is on rider control and mechanical performance). Connectivity Features: N/A 🔧 Maintenance Service Intervals Oil Change Interval: Refer to manual for specific mileage/hour intervals; typically 1000-1500 miles or 30-50 hours for competitive use. Air Filter Cleaning: Frequent cleaning recommended, especially in dusty conditions; covered in detail. Fluid Specifications Engine Oil Type: Yamalube or equivalent API SG, SAE 10W-40 or 20W-40 (specific viscosity depends on ambient temperature, consult manual). Engine Oil Capacity: Refer to manual, typically around 1.5-1.8...