🏷️ 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 (or equivalent SAE 10W-40, API SG or higher) Engine Oil Capacity: Approximately 2.0 liters (when filter is changed) Coolant Type: Permanent antifreeze (ethylene glycol based) with distilled water (50/50 mix) Known Issues Carburetor Tuning: Carburetors can sometimes require adjustment due to altitude or fuel quality changes. Cvt Belt Wear: Regular inspection and replacement of the CVT belt are crucial for optimal performance. Cvt Clutch Maintenance: Proper clutch maintenance, including cleaning and checking weights, is important. 4X4 System Maintenance: Regular lubrication and inspection of the 4x4 components are recommended. 📚 Vehicle History Brand Heritage Manufacturer Origin: Japan Model Evolution Wolverine Lineage: The Wolverine series has been a staple in Yamaha's ATV lineup, known for its utility and off-road capability. Production Production Period: The YFM350 Wolverine was produced for several years, with the 2003 model being a significant iteration. 🏆 Awards & Recognition Recognitions Industry Standing: Yamaha ATVs are generally well-regarded for reliability and performance in their class.