🏷️ Basic Information Identification Make: Yamaha Model: XS400 Production Years Covered: 1977, 1978, 1979, 1980, 1981, 1982 Codes Model Code Range: XS400G, XS400H, XS400J, XS400K, XS400SH, XS400SJ, XS400SK (Specific codes may vary by market and sub-model) 👋 Introduction Market Position Market Niche: Sportbike/Standard Motorcycle for its era, popular for its balance of performance and everyday usability. Competitive Analysis Key Competitors: Honda CB550/CB650, Kawasaki KZ550/KZ650, Suzuki GS550/GS650. Key Features Manual Benefits: Empowers owners and technicians with comprehensive, detailed information for all repair and maintenance needs, mirroring professional technician resources. Manual Presentation: Structured with numbered steps, notes, cautions, warnings, and clear figure references for ease of use. 📋 Manual Details Coverage Areas Manual Type: Full Service Repair Manual Primary Coverage: Repair, Maintenance, Rebuild, Refurbish, Restoration Page Count Estimated Page Count: Refer to individual manual; typically 200-500+ pages for comprehensive coverage. Manual Type Intended Audience: Professional Technicians and Experienced DIY Mechanics Language Language: English Format File Format: PDF (Portable Document Format) 📖 Manual Coverage Systems Covered Engine Systems: Engine disassembly, assembly, tuning, lubrication, cooling system, ignition system, fuel system (carburetors), exhaust system. Drivetrain Systems: Clutch, transmission, final drive (chain and sprocket), gearbox overhaul. Chassis Systems: Frame, front suspension (forks), rear suspension (shocks/swingarm), steering system, wheels, brakes (front and rear). Electrical Systems: Wiring diagrams, lighting system, starting system, charging system, battery, ignition coil, starter motor, switches. Bodywork And Trim: Body panels, fuel tank, seat, fenders, handlebars, controls, instruments, trim components. Procedures Included Maintenance Procedures: Oil changes, filter replacements, spark plug inspection/replacement, chain adjustment, brake fluid changes, carburetor synchronization. Diagnostic Procedures: Troubleshooting common problems, electrical fault finding, carburetor performance diagnosis. Repair Procedures: Detailed step-by-step instructions for component removal, installation, and repair. Rebuild Procedures: Comprehensive instructions for engine and transmission overhauls. Technical Depth Depth Of Coverage: Detailed, encompassing everything from routine maintenance to complete engine and transmission rebuilds. 📊 Manual Specifications File Format Print Quality: Full Printable (High Resolution for clear printing) Binding Type Binding Type: Digital (PDF - Printable) Paper Type Paper Type Equivalent: N/A (Digital format) Delivery Delivery Method: Instant Download Requirements Required Software: Adobe PDF Reader, WinRAR (for potential archive extraction) Compatibility Operating Systems: All Versions of Windows & Mac ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, 4-stroke, DOHC, Parallel-Twin Displacement: 392 cc (approx.) Bore X Stroke: 69.0 mm x 51.4 mm (typical for early models) Compression Ratio: 9.2:1 (typical) Performance Horsepower: Approximately 35-45 HP @ 8000-9000 RPM (varies by year and specific model tune) Torque: Approximately 30-35 Nm @ 6000-7000 RPM (varies by year and specific model tune) Fuel System Carburetor Type: Dual Mikuni VM34 or similar constant velocity carburetors Fuel Capacity: Approximately 12-15 Liters (varies by model) Ignition System Ignition Type: Electronic Ignition (CDI) or TCI depending on the specific year 🔧 Transmission Standard Transmission Type: 6-speed, constant mesh Features Clutch Type: Wet, multi-plate Final Drive: Chain drive 📐 Dimensions Weights Dry Weight: Approximately 170-180 kg (varies by model) Overall Length: Approximately 2100-2200 mm (varies by model) Overall Width: Approximately 750-850 mm (varies by model) Wheelbase: Approximately 1400-1450 mm (varies by model) Seat Height: Approximately 780-800 mm (varies by model) 🛡️ Safety Features Active Features Braking System Front: Single Disc Brake (some later models may have dual discs) Braking System Rear: Drum Brake Passive Features Frame Type: Steel Double Cradle Frame Lighting: Halogen Headlight, LED/Incandescent Tail and Turn Signals 💡 Technology Features Infotainment Instrumentation: Analog speedometer, tachometer, odometer, trip meter, neutral indicator, oil pressure warning light, high beam indicator. Driver Assistance ABS: Not available. Connectivity Charging System: Alternator with external regulator (or internal on later models). 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 3,000-5,000 km or 6-12 months (refer to manual for specific mileage/time). Valve Clearance Check Interval: Typically every 6,000-10,000 km (crucial for engine longevity). Spark Plug Replacement Interval: Inspect every 5,000 km, replace as needed or every 10,000-15,000 km. Fluid Specifications Engine Oil Type: Yamalube or equivalent motorcycle-specific 10W-40 or 20W-50 API SE, SF, or SG (check manual for exact viscosity and API rating). Engine Oil Capacity: Approximately 2.0-2.5 Liters (with filter change, check manual). Brake Fluid Type: DOT 3 or DOT 4 (check manual, typically replaced every 2 years). Fork Oil Type: Yamalube Fork Oil or equivalent SAE 10W (check manual for specific weight and quantity). Known Issues Common Wear Items: Carburetor diaphragm wear, aging electrical connectors, worn fork seals, cam chain tensioner wear. Typical Maintenance Challenges: Carburetor synchronization can be finicky, some electrical components may require cleaning or replacement due to age, valve adjustments require care. 📚 Vehicle History Brand Heritage Yamaha Motorcycle History: Yamaha Motor Company, established in 1955, has a rich history in motorcycle manufacturing, known for innovation and performance across various segments. Model Evolution Xs400 Genesis: The XS400 was introduced as Yamaha's offering in the mid-weight parallel-twin segment, aiming to provide a balance of sporty performance and everyday practicality. Xs400 Variants:...