🏷️ Basic Information Identification Make: Suzuki Model: GN400 Product Name: Suzuki GN400 Motorcycle Factory Service/Repair Manual SUPPLEMENT-GN 400-PDF Product Description: SUZUKI GN400 MOTORCYCLE FACTORY SERVICE / REPAIR MANUAL SUPPLEMENT - GN 400 - PDF - INSTANT DOWNLOAD!! Manual Note: This is a supplementary service manual and does not include the main manual. 👋 Introduction Market Position Target Audience: Suzuki GN400 owners, DIY enthusiasts, independent mechanics, and dealership technicians. Competitive Analysis Differentiation: Vehicle-specific, factory-quality information, unlike generic repair guides. Key Features Content Style: Step-by-step instructions, diagrams, specifications, and wiring schematics. Ease Of Use: Designed for ease of use, enabling users to perform repairs with confidence. Authenticity: Represents the same information used by professional technicians. 📋 Manual Details Coverage Areas Coverage Scope: All models & all repairs A-Z Page Count Page Count: Not specified, but described as comprehensive. Manual Type Manual Type: Factory Service/Repair Manual Supplement Language Language: English Format Format: PDF (Digital Download) 📖 Manual Coverage Systems Covered Engine System: Detailed repair, restoration, and maintenance procedures for the GN400 engine. Fuel System: Carburetor tuning, fuel delivery, and related components. Ignition System: Ignition timing, spark plug specifications, and troubleshooting. Exhaust System: Exhaust pipe and muffler maintenance and repair. Transmission System: Gearbox operation, clutch adjustment, and related components. Drivetrain System: Chain drive maintenance, sprockets, and related components. Braking System: Front and rear brake system maintenance, adjustment, and component replacement. Suspension System: Front fork and rear shock absorber servicing and adjustment. Electrical System: Wiring schematics, lighting system, charging system, and battery maintenance. Frame And Bodywork: Frame inspection, body panel removal and installation. Wheels And Tires: Tire pressure, wheel balancing, and spoke tensioning. Controls And Instruments: Handlebar controls, instrument panel operation and repair. Procedures Included Maintenance Procedures: Regular servicing, lubrication, filter changes, and fluid checks. Troubleshooting Guides: Step-by-step diagnostic procedures for common and complex issues. Repair Procedures: Detailed instructions for component disassembly, repair, and reassembly. Restoration Guides: Guidance for bringing older or damaged vehicles back to operational status. Component Replacement: Instructions for replacing worn or damaged parts across all systems. Technical Depth Depth Level: Covers everything from very simple repairs to complex ones, suitable for DIY enthusiasts and professionals. Expertise Level: No technical expertise required due to clear instructions and illustrations. 📊 Manual Specifications File Format File Type: PDF Print Quality Image Quality: Clear pictures and zoomable illustrations. Scalability: Illustrations are zoomable for detailed viewing. Binding Type Binding: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) Accessibility Usage Platform: Referable from PC/Laptop, with option to print specific pages. ⚙️ Engine Specifications Primary Engine Engine Type: 4-stroke, SOHC, Single Cylinder (details likely within the manual) Engine Displacement: 398cc (for most GN400 models, precise year variations possible) Bore X Stroke: Specifics available in manual (typical for this era: ~82mm x 74.4mm) Compression Ratio: Specifics available in manual (typical for this era: ~8.2:1) Performance Horsepower: Details in manual (typically around 26-30 HP) Torque: Details in manual (typically around 30-33 Nm) Fuel System Carburetion: Likely a Mikuni VM series carburetor (specific model in manual, e.g., VM32SS) Fuel Type: Unleaded gasoline (recommendation in manual) 🔧 Transmission Standard Transmission Type: 5-speed constant mesh Clutch Type: Wet multi-plate Features Final Drive: Chain drive 📐 Dimensions Exterior Wheelbase: Specifics available in manual (typical GN400: ~1430 mm / 56.3 in) Weights Dry Weight: Specifics available in manual (typical GN400: ~154 kg / 340 lbs) 🛡️ Safety Features Ratings Safety Ratings: N/A (Motorcycle safety ratings as per automotive crash tests are not applicable.) Active Features Active Safety: Effective braking system (disc front, drum rear typical), well-balanced chassis. Passive Features Passive Safety: Sturdy frame construction. 💡 Technology Features Infotainment Infotainment System: N/A (Motorcycle of this era typically features analog instrumentation). Driver Assistance Driver Assistance Features: N/A Connectivity Connectivity Features: N/A 🔧 Maintenance Service Intervals Oil Change Interval: Refer to manual for specific mileage/time intervals (typically 3,000-5,000 km or 6-12 months). Spark Plug Replacement: Refer to manual for recommended intervals and types. Chain Lubrication Adjustment: Recommended at regular intervals, especially after washing or riding in wet conditions. Fluid Specifications Engine Oil Type: Refer to manual for specific viscosity grade and API classification (e.g., SAE 10W-40 API SE or SF). Engine Oil Capacity: Refer to manual for capacity (typically around 2.0-2.5 liters with filter change). Brake Fluid Type: Refer to manual for DOT specification (likely DOT 3 or DOT 4). Fork Oil Type: Refer to manual for viscosity and quantity. Known Issues Common Wear Items: Clutch wear, carburation issues due to age, front fork seal leaks, electrical connection corrosion. Common Issues Performance Degradation: Loss of power due to worn piston rings, valve seat wear, or clogged carburetors. Electrical Failures: Stator or rectifier failure, wiring harness degradation. 📚 Vehicle History Brand Heritage Manufacturer: Suzuki Motor Corporation, Japan Model Evolution Model Line: The GN series was part of Suzuki's line of versatile, relatively lightweight motorcycles, often styled as...