This document provides comprehensive service information for the 2003 Wolverine Automatic 4X4. As a capable all-terrain vehicle, the Wolverine is renowned for its robust engineering and reliability, making it a popular choice for recreational and utility purposes. Its design emphasizes durability and performance, featuring a liquid-cooled, four-stroke engine, an automatic Continuously Variable Transmission (CVT), and a 4x4 drivetrain for superior traction. With its substantial cargo capacity and solid construction, the YFM 350 FWAN Wolverine is built to tackle challenging terrains and demanding tasks. This factory service manual is meticulously crafted to assist both do-it-yourself enthusiasts and professional technicians in maintaining and repairing the 2003 Wolverine. It covers a wide array of critical systems, including detailed procedures for engine assembly, fuel and electrical systems, drivetrain, suspension, and braking. The manual offers step-by-step repair instructions, comprehensive troubleshooting guides, detailed specifications, and clear diagrams, ensuring that all maintenance and repair tasks are performed accurately and efficiently to preserve the vehicle's optimal performance and longevity. 🏷️ Basic Information Identification Make: Yamaha Model: YFM 350 FWAN Wolverine Model Variant: Automatic 4X4 Year: 2003 Codes Chassis Code Prefix: 1UY Engine Code Prefix: 1UY 👋 Introduction Market Position Target Audience: Do-it-yourselfer (DIY) and experienced mechanics. Competitive Analysis Value Proposition: Provides factory-level repair and maintenance information for cost-effective ownership. Key Features Documentation Type: Factory Service Manual for comprehensive repair and maintenance. Instruction Method: Step-by-step instructions, diagrams, and exploded pictures. 📋 Manual Details Coverage Areas Product Type: Service Manual Primary Coverage: 2003 Yamaha YFM 350 FWAN Wolverine Automatic 4X4 Page Count Estimated Page Count: N/A (Digital Download) Manual Type Manual Category: Factory Repair Manual Language Language: English Format File Format: PDF Download 📖 Manual Coverage Systems Covered Engine Assembly: Complete disassembly, inspection, repair, and reassembly of the engine. Fuel System: Carburetor service, fuel pump, fuel lines, fuel tank maintenance. Transmission System: Automatic CV transmission inspection, adjustment, and potential rebuild procedures. Drivetrain: 4x4 system, driveshafts, differentials, wheel hubs, and related components. Suspension System: Front and rear suspension, shocks, springs, control arms, and bushings. Braking System: Brake caliper service, brake pads, brake lines, master cylinder, and parking brake. Electrical System: Wiring diagrams, battery, charging system, ignition system, lighting, and controls. Steering System: Steering column, tie rods, ball joints, and steering linkage. Cooling System: Radiator, coolant, thermostat, water pump, and hoses. Exhaust System: Muffler, pipes, and hangers. Body And Frame: Frame inspection, body panels, seat, handlebars, fenders, and racks. Procedures Included Maintenance Tasks: Routine maintenance, oil changes, filter replacements, lubrication, valve adjustments. Troubleshooting Guide: Diagnostic procedures for common issues and fault finding. Repair Instructions: Detailed step-by-step instructions for component repair and replacement. Rebuilding Procedures: Comprehensive instructions for engine and transmission rebuilding. Disassembly Reassembly: Exploded views and detailed steps for dismantling and reassembling all major components. Wiring Diagrams: Complete and detailed electrical wiring schematics. Technical Depth Diagnostic Level: Advanced diagnostics and troubleshooting for all systems. Rebuild Capability: Full engine and transmission rebuild capabilities. Detail Level: Highly detailed with step-by-step instructions and illustrations. 📊 Manual Specifications File Format Searchable Text: Yes (typical for PDF service manuals) Print Quality Illustration Clarity: High (as described, with diagrams and illustrations) Binding Type Delivery Method: Digital Download (PDF) Paper Type Physical Format Description: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Type: Four-stroke, SOHC, 4-valve Displacement: 348 cc Bore X Stroke: 83 mm x 64.5 mm Cooling Method: Liquid-cooled Compression Ratio: 9.2:1 Ignition System: CDI (Capacitor Discharge Ignition) Performance Horsepower Est: Approximately 20-22 HP (at crankshaft, estimated) Torque Est: Approximately 20-22 lb-ft (at crankshaft, estimated) Fuel System Carburetor Type: Mikuni BNS36 (likely) Fuel Type: Unleaded gasoline (minimum 87 octane recommended) 🔧 Transmission Standard Transmission Type: Automatic Continuously Variable Transmission (CVT) Drive Type: Shaft drive, 4x4 with differential lock Features Gear Selection: Forward (Hi/Lo), Neutral, Reverse Transmission Fluid Type: Yamaha's recommended CVT fluid (specific part number likely in manual) 📐 Dimensions Exterior Length: Approximately 76.4 inches (1940 mm) Width: Approximately 42.7 inches (1085 mm) Height: Approximately 45.1 inches (1145 mm) Weights Dry Weight: Approximately 536 lbs (243 kg) Ground Clearance: Approximately 7.1 inches (180 mm) Cargo Front Rack Capacity: Approximately 45 kg / 100 lbs Rear Rack Capacity: Approximately 85 kg / 187 lbs 🛡️ Safety Features Ratings Classification: ATV (All-Terrain Vehicle) Active Features Braking Type: Hydraulic disc brakes (front and rear) Parking Brake: Yes Passive Features Lighting: Dual Halogen headlights, 30W x 2, Taillight/Brake light, 5W/21W 💡 Technology Features Infotainment Display System: Basic LCD instrumentation (speedometer, odometer, fuel gauge, etc.) Driver Assistance Traction Control: None (Mechanical 4x4 system) Connectivity Connectivity Features: N/A (Basic off-road vehicle) 🔧 Maintenance Service Intervals Engine Oil Change: Every 3000 km or 6 months (refer to manual for precise interval) Air Filter Cleaning: Regular inspection, clean every 1000 km or as needed in dusty conditions. Spark Plug Replacement: Refer to manual for specific interval, typically 3000-6000 km. Fluid Specifications Engine Oil Type: Yamalube 4...