🏷️ Basic Information Identification Make: Yamaha Model: XS400 Year: 1980 Codes Model Code: XS400-G (likely, specific codes can vary by market) 👋 Introduction Market Position Target Audience: Professional motorcycle technicians and experienced DIY enthusiasts Competitive Analysis Manual Value Proposition: Provides comprehensive coverage for all repair and maintenance needs, mirroring professional workshop manuals at a fraction of the cost of physical copies and with immediate access. Key Features Instructional Format: Numbered step-by-step instructions with detailed illustrations and photos Critical Information Highlighting: Notes, cautions, and warnings integrated within repair procedures Illustration Enhancement: Enlarged inset diagrams for detailed part examination Navigation: Numbered table of contents for quick information retrieval 📋 Manual Details Coverage Areas Coverage Scope: Comprehensive service, repair, maintenance, and restoration Page Count Estimated Page Count: Likely 300-500+ pages (typical for full service manuals of this era, actual count not provided) Manual Type Manual Classification: Full Service Repair Manual Language Primary Language: English Format Digital Format: PDF 📖 Manual Coverage Systems Covered Engine System: Full engine disassembly, assembly, tuning, diagnostics, lubrication, cooling system Fuel System: Carburetor servicing (including jetting, float levels), fuel lines, fuel pump (if applicable) Ignition System: CDI unit, spark plugs, ignition coils, timing adjustment, troubleshooting Transmission System: Gearbox removal, disassembly, reassembly, clutch operation, lubrication Chassis Suspension: Front forks (fork seals, oil changes, damping), rear shock absorbers, swingarm, steering head bearings Braking System: Front and rear brake caliper servicing, brake pad replacement, master cylinder overhaul, brake fluid bleeding, linkage adjustments Electrical System: Complete wiring diagrams, lighting, charging system (alternator, rectifier/regulator), starter motor, battery, troubleshooting electrical faults Exhaust System: Exhaust pipe inspection, muffler maintenance, gasket replacement Bodywork Frame: Frame inspection, body panel removal and installation, seat, fenders, tank mounting Procedures Included Maintenance Procedures: Oil changes, filter replacement, spark plug replacement, chain adjustment, brake adjustments, valve clearance checks Repair Procedures: Engine rebuild, carburetor synchronization, suspension overhaul, electrical component replacement, brake system repair Diagnostic Procedures: Troubleshooting guides for common mechanical and electrical issues, component testing Restoration Procedures: Detailed instructions suitable for refurbishing and restoring the motorcycle Technical Depth Depth Of Information: Professional Technician Level, suitable for experienced DIY mechanics Diagnostic Capabilities: Extensive electrical troubleshooting with combined wiring diagrams 📊 Manual Specifications File Format File Type: PDF Print Quality Printability: Full Printable Binding Type Digital Binding: N/A (Digital Download) Paper Type Digital Paper: N/A (Digital Download) Software Requirements Reader Software: Adobe PDF Reader Compression Software: WinRAR (likely for zipped files) Compatibility Operating Systems: All Versions of Windows & Mac Delivery Method Delivery Option: Instant Download ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, 4-stroke, DOHC, Parallel-Twin Displacement: 392 cc (This is the typical displacement for the XS400 of this era, though specific variants might exist) Bore X Stroke: Approximately 62.4 mm x 64.0 mm (typical for this engine configuration, verify with specific model data) Compression Ratio: Typically around 8.4:1 to 9.5:1 (verify for the specific 1980 model) Performance Horsepower: Approximately 27-35 HP at 7500-8000 RPM (estimate based on historical data, specific figure varies) Torque: Approximately 30-35 Nm at 6000-6500 RPM (estimate based on historical data) Fuel System Carburetion: Twin Mikuni VM-series carburetors (e.g., VM26 or VM28, verify exact model) Fuel Tank Capacity: Approximately 14-16 Liters (estimate, varies by sub-model) Ignition System Ignition Type: CDI (Capacitor Discharge Ignition) Cooling System Cooling Method: Air-cooled Lubrication System Oil Capacity: Approximately 2.0-2.5 Liters (dry fill, verify with manual) Oil Type: Yamalube SAE 10W-40 or SAE 20W-40 motorcycle oil (verify specific grade and API classification) 🔧 Transmission Standard Transmission Type: 5-speed constant mesh Final Drive: Chain drive Features Clutch Type: Wet, multi-plate Transmission Oil Capacity: Approximately 0.7-0.9 Liters (verify with manual) Transmission Oil Type: Yamalube SAE 80 or SAE 90 hypoid gear oil (API GL-4, verify with manual) 📐 Dimensions Exterior Wheelbase: Approximately 1390 mm (54.7 inches) (estimate, verify) Overall Length: Approximately 2160 mm (85.0 inches) (estimate, verify) Weights Dry Weight: Approximately 175-185 kg (385-408 lbs) (estimate, verify) Wet Weight: Approximately 190-200 kg (419-441 lbs) (estimate, verify) Wheels Tires Front Tire Size: 3.00-18 47P (common, verify) Rear Tire Size: 3.50-18 56P (common, verify) Front Wheel Type: Spoked or Cast Aluminum (depending on variant) Rear Wheel Type: Spoked or Cast Aluminum (depending on variant) 🛡️ Safety Features Ratings Crash Test Ratings: N/A (Motorcycles are not subjected to standardized automotive crash testing) Active Features Braking Performance: Front: Single Disc, Rear: Drum Brake (typical configuration for 1980 models) Suspension Damping: Adjustable pre-load on rear shocks (common feature) Passive Features Lighting System: Halogen headlamp, taillight, brake light, turn signals 💡 Technology Features Infotainment Infotainment System: N/A (Motorcycle of this era, basic analog instrumentation) Driver Assistance Rider Aids: N/A (No electronic rider aids) 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,000-5,000 km (1,800-3,000 miles) or annually, whichever comes first (recommendation, verify with manual) Valve Adjustment Interval: Every 6,000-10,000 km (3,600-6,000 miles) (recommendation, verify with manual) Spark Plug Replacement Interval: Every 12,000-15,000 km (7,200-9,000...