🏷️ Basic Information Identification Make: Yamaha Model: XS400 Generation Model Generation: First Generation (XS400-1, XS400-2) Codes Chassis Codes: Often referred to by engine type/variant codes, e.g., 2H7, 4G5 👋 Introduction Market Position Target Audience: Yamaha XS400 owners, independent repair shops, DIY enthusiasts Competitive Analysis Value Proposition: Provides dealership-level repair and maintenance information at a fraction of the cost Key Features Accuracy Conciseness: Accurate, clear, and concise text combined with detailed illustrations Vehicle Specificity: Vehicle-specific, not generic repair information Cost Savings: Enables significant cost savings on maintenance and repairs 📋 Manual Details Coverage Areas Covered Years: 1977, 1978, 1979, 1980, 1981, 1982 Page Count Estimated Page Count: Detailed PDF, estimated to be comprehensive, likely 300+ pages Manual Type Type: Service Repair Workshop Manual Language Language: English Format File Format: PDF 📖 Manual Coverage Systems Covered Engine: Complete engine overhaul, diagnostics, carburetor tuning, valve adjustment Transmission: Gearbox disassembly, inspection, assembly, clutch operation Drive System: Drive chain inspection, adjustment, sprocket replacement, lubrication Fuel System: Carburetor service, fuel tank, fuel lines, fuel pump (if applicable) Cooling System: Coolant specifications, radiator service, thermostat Electrical System: Ignition system, lighting, battery, charging system, starter motor, wiring diagrams Brakes: Front and rear brake systems, hydraulic components, pad/shoe replacement Suspension: Front forks, rear shock absorbers, adjustments, rebuild procedures Steering: Handlebar, steering head bearings, lubrication, adjustments Bodywork: Panel removal, seat, fenders, trim components Intake Exhaust: Air filter service, exhaust system inspection and maintenance Procedures Included Routine Maintenance: Oil changes, filter replacements, chain lubrication, tire pressure checks Periodic Checks: Valve clearance, spark plug condition, brake fluid levels Troubleshooting: Systematic diagnostic procedures for common and advanced issues Rebuilds: Engine, carburetor, and suspension component rebuilds Adjustments: Carburetor synchronization, idle speed, clutch and brake levers Technical Depth Depth: Comprehensive from basic owner maintenance to full engine and electrical system overhauls Diagrams Illustrations: Includes detailed diagrams, illustrations, and exploded views for clarity Wiring Schematics: Complete electrical wiring diagrams for troubleshooting and repair 📊 Manual Specifications File Format Compatibility: Compatible with all versions of Windows and Mac Print Quality Printability: All pages are printable Binding Type Binding: N/A (Digital PDF format) Paper Type Paper Type: N/A (Digital PDF format) Requirements Software Requirements: Adobe PDF Reader ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, four-stroke, DOHC parallel-twin Displacement: 392 cc (approximately) Bore X Stroke: Specifications vary slightly by sub-model, typically around 64.0 mm x 62.0 mm Compression Ratio: Typically around 8.8:1 to 9.2:1 Performance Horsepower: Approximately 33-36 hp at 7,500-8,000 rpm Torque: Approximately 23-25 lb-ft at 6,000-6,500 rpm Fuel System Carburetion: Dual Mikuni VM34-type carburetors (or similar VM series) Fuel Capacity: Approx. 12-14 liters (3.2-3.7 US gallons) 🔧 Transmission Standard Transmission Type: Constant mesh, 5-speed sequential manual Optional Optional Transmission: N/A Features Clutch Type: Wet, multi-plate, diaphragm spring Final Drive: Enclosed chain drive 📐 Dimensions Exterior Length: Approximately 2,100-2,200 mm (varies by model year) Width: Approximately 750-800 mm Height: Approximately 1,100-1,150 mm Weights Dry Weight: Approximately 170-185 kg Wet Weight: Approximately 185-200 kg 🛡️ Safety Features Ratings Safety Ratings: N/A (Motorcycle safety is assessed differently than cars) Active Features Braking System: Dual front disc brakes (on later models), single rear disc or drum brake Passive Features Lighting: Headlight, taillight, turn signals, brake light 💡 Technology Features Infotainment Infotainment System: N/A (Analog instrumentation typical for the era) Driver Assistance Driver Assistance Features: N/A Connectivity Connectivity Features: N/A 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 2,000-3,000 miles or 6 months (refer to manual for exact specification) Valve Adjustment Interval: Typically every 4,000-6,000 miles Chain Lubrication Interval: Every 500-1,000 miles and after washing or riding in wet conditions Fluid Specifications Engine Oil Type: Yamalube 4 (or equivalent motorcycle-specific 10W-40 or 20W-50 API SG or higher) Engine Oil Capacity: Approx. 2.0-2.4 liters (with filter change) Brake Fluid Type: DOT 3 or DOT 4 hydraulic brake fluid Known Issues Common Problems: Carburetor synchronization issues, potential electrical connector corrosion, drive chain wear Maintenance Focus: Regular lubrication of the drive chain and periodic carburetor tuning are crucial for optimal performance. 📚 Vehicle History Brand Heritage Yamaha Motorcycles: Yamaha Motor Company, Ltd. has a long history of producing quality motorcycles since the 1950s. Model Evolution Xs400 Development: Introduced as a more accessible, mid-size parallel-twin to complement Yamaha's larger offerings, focusing on a balance of performance and usability. Production Production Period: 1977-1982 🏆 Awards & Recognition Recognitions Industry Awards: N/A (Specific awards not typically documented for this model) Ratings User Ratings: Generally regarded as a reliable and enjoyable motorcycle for its era, popular among enthusiasts.