This manual covers the motorcycle, produced across the years 1977 through 1982. The , a significant model in motorcycle lineage, is recognized for its reliable parallel-twin engine, available in Standard and Special variants, offering a balanced blend of performance and user-friendliness. Its engineering reflects a commitment to quality, making it a popular choice for riders seeking dependable transportation and enjoyable riding experiences during its production era. This comprehensive workshop service and repair manual provides detailed information for owners and technicians. It encompasses a wide array of critical areas, including in-depth engine and drivetrain maintenance, chassis and suspension servicing, electrical system diagnostics, braking system procedures, fuel system upkeep, and bodywork guidance. The manual includes routine maintenance schedules, troubleshooting guides for common issues, major repair procedures, and essential technical specifications, ensuring the proper upkeep and restoration of your . 🏷️ Basic Information Identification Make: Yamaha Model: XS400 Model Variants: XS400 Standard, XS400 Special (potential variations across years) Codes Production Years Covered: 1977, 1978, 1979, 1980, 1981, 1982 👋 Introduction Market Position Target Audience: Professional motorcycle technicians, experienced DIY enthusiasts, and owners seeking in-depth maintenance and repair knowledge for their Yamaha XS400. Competitive Analysis Value Proposition: Provides comprehensive, manufacturer-approved repair data, saving owners significant costs associated with dealership labor. Offers detailed, step-by-step instructions for complex tasks. Key Features Benefits: Empowers owners to perform their own maintenance and repairs, extends the lifespan of the motorcycle, enhances understanding of vehicle systems, facilitates accurate diagnostics. Manual Source: Original manufacturer's workshop manual, providing the most accurate and complete information. 📋 Manual Details Coverage Areas Manual Scope: Comprehensive workshop service and repair for Yamaha XS400 models from 1977-1982. Page Count Estimated Page Count: Hundreds of pages (typical for a factory-level workshop manual covering multiple model years). Manual Type Type: Workshop Service Manual / Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine And Drivetrain: Engine overhaul, tuning, carburetor service, ignition system, transmission maintenance and repair, clutch operation, final drive. Chassis And Suspension: Front fork service and rebuild, rear shock absorber inspection and replacement, steering head bearing maintenance, wheel bearing service. Electrical System: Complete wiring diagrams, lighting system troubleshooting, charging system (alternator, regulator/rectifier), starting system, battery maintenance. Braking System: Front and rear brake inspection, adjustment, hydraulic system service (master cylinder, calipers, lines), brake pad replacement. Fuel System: Fuel tank inspection, fuel pump operation (if applicable), fuel lines, carburetor cleaning, adjustment, and synchronization. Bodywork And Trim: Seat removal, fender inspection, headlight and taillight assembly, minor bodywork repair guidance. Cooling System: Air cooling system inspection and maintenance. Exhaust System: Exhaust pipe and muffler inspection, gasket replacement. Procedures Included Routine Maintenance: Oil change intervals and specifications, spark plug replacement, air filter cleaning/replacement, chain adjustment and lubrication, brake fluid checks, tire pressure. Troubleshooting Guides: Diagnostic charts for common starting, running, and electrical issues; symptom-based problem resolution. Major Repairs: Engine rebuild procedures, transmission disassembly and assembly, suspension component overhauls, carburetor rebuilding. Technical Specifications: Detailed torque specifications, engine clearances, valve adjustments, ignition timing settings, carburetor jetting data. Tuning And Adjustment: Engine tuning, idle speed adjustment, ignition timing adjustment, carburetor synchronization. Diagnostic Charts: Troubleshooting flowcharts for electrical and mechanical issues. Technical Depth Depth: Full factory-level technical depth, suitable for professional technicians and experienced DIY mechanics. Covers everything from basic adjustments to complete engine and transmission overhauls. 📊 Manual Specifications File Format File Type: PDF Compatibility: Compatible with all versions of Windows & Mac. Print Quality Printable: Yes, full printable Zoom Capability: Yes, zoom in/out Binding Type Delivery Method: Instant Download (no physical binding as it's digital) Paper Type Digital Format Notes: Electronic format, viewable with Adobe PDF Reader. Requires WinRAR for potential decompression if archived. ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, 4-stroke, DOHC parallel-twin Displacement: Approximately 392cc to 425cc (depending on specific model year variant and potential engine updates) Bore X Stroke: Typical figures around 69.0mm x 52.4mm (verify specific year in manual) Compression Ratio: Generally around 9.5:1 to 10.0:1 (verify specific year) Performance Horsepower Output: Estimated 27-36 HP at 7,500-8,500 RPM (varies by year and tuning) Torque Output: Estimated 24-30 lb-ft at 6,000-7,000 RPM (varies by year) Fuel System Carburetion: Twin Mikuni carburetors (e.g., VM30SC or similar size, depending on year) Fuel Delivery: Gravity feed from fuel tank, often with a vacuum-operated petcock. 🔧 Transmission Standard Transmission Type: Constant mesh 5-speed sequential gearbox Optional Transmission Variants: No known optional transmissions for this model. Features Clutch Type: Wet, multiple-disc, cable-actuated clutch Final Drive: O-ring sealed chain drive 📐 Dimensions Exterior Overall Length: Refer to specific model year specifications in manual (typically around 80-85 inches) Overall Width: Refer to specific model year specifications in manual (typically around 30-33 inches) Wheelbase: Refer to specific model year specifications in manual (typically around 55-57 inches) Weights Dry Weight: Approximately 370-410 lbs (depending on year and configuration) Fuel Capacity: Typically 3.4 - 4.2...