🏷️ 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 liters for engine lubrication and transmission. Coolant Type: Yamaha's recommended mixture of ethylene glycol-based coolant and distilled water (50/50 ratio). Brake Fluid Type: DOT 4 brake fluid. Known Issues Common Wear Items: Clutch wear, valve stem seals, cam chain tensioner, carburetor jetting adjustments for altitude/conditions. Typical Maintenance Tasks: Regular cleaning and re-oiling of air filter, chain lubrication and adjustment, spark plug inspection, valve clearance checks. Special Tools Tool Requirement: Manual refers to specific Yamaha WR400F special tool numbers for certain adjustments and repairs, often illustrated. Torque Wrench: Essential for ensuring fasteners are tightened to specification. 📚 Vehicle History Brand Heritage Yamaha Motorcycles: Yamaha has a long-standing reputation for performance-oriented motorcycles, particularly in off-road and motocross disciplines. Model Evolution Wr Series Development: The WR series represents Yamaha's lineage of competitive enduro motorcycles, often derived from their YZ motocross platforms, adapted for off-road legal use and longer-distance riding. Production Production Period Overview: The WR400F was a significant model in the late 1990s and early 2000s, bridging the gap between pure motocross and dedicated enduro machines. 🏆 Awards & Recognition...