This manual covers the utility All-Terrain Vehicle, produced for the model years 2004 through 2006. Renowned for its reliable 348cc liquid-cooled engine and comfortable ride, the Bruin 350 offers a capable platform for recreational riders, utility tasks, and outdoor enthusiasts. The legacy in ATV manufacturing is characterized by durable engineering and consistent performance, and the Bruin 350 exemplifies this with its balance of capability and user-friendliness, making it a solid choice for various applications. This comprehensive factory service manual provides detailed information for the complete repair and maintenance of your Bruin 350. It covers all essential systems, including the engine, automatic transmission, drivetrain, chassis, suspension, steering, and brakes, along with detailed electrical system schematics. Within these pages, you will find step-by-step procedures for disassembly and assembly, routine maintenance schedules, troubleshooting guides for common issues, and precise technical specifications. This manual is an indispensable resource for owners and technicians alike, empowering them to maintain the vehicle's optimal performance and longevity while adhering to factory standards. 🏷️ Basic Information Identification Make: Yamaha Model: Bruin 350 Model Variants: 2WD Model Codes: YFM35AS, YFM35BAT, YFM35BAV Model Years: 2004, 2005, 2006 👋 Introduction Market Position Vehicle Segment: Utility ATV (All-Terrain Vehicle) Target Audience: Recreational riders, utility users, farmers, hunters Competitive Analysis Competitors: Honda FourTrax, Kawasaki Bayou, Suzuki King Quad Key Features Vehicle Usp: Reliable 350cc engine, comfortable ride, capable 2WD platform for general use Manual Value Proposition Benefit To Owner: Empowers owners to perform routine maintenance, diagnose issues, and undertake repairs, saving time and money compared to dealership service. Content Advantage: Provides factory-accurate procedures and specifications, ensuring repairs are performed to original manufacturer standards. 📋 Manual Details Coverage Areas Coverage Scope: Complete vehicle repair and maintenance Page Count Estimated Page Count: Approximately 300-500 pages (typical for this class of service manual) Manual Type Manual Type: Factory Service Manual / Repair Manual Language Language: English Format Format: PDF (Downloadable) 📖 Manual Coverage Systems Covered Engine: Internal combustion engine, lubrication, cooling, fuel, exhaust Transmission: Automatic transmission, internal components, clutch system Drivetrain: Final drive, driveshafts, differentials Chassis: Frame, bodywork, seating, storage Suspension: Front and rear suspension components, shock absorbers, linkages Steering: Steering column, tie rods, steering mechanism Brakes: Brake system components, hydraulics, calipers, pads, rotors Electrical: Ignition system, starting system, charging system, lighting, instrumentation, battery Wiring Diagrams: Comprehensive electrical schematics for all systems Procedures Included Maintenance: Scheduled maintenance, fluid changes, filter replacements, lubrication points Troubleshooting: System-specific diagnostic procedures, common fault identification Disassembly Assembly: Detailed step-by-step instructions for component removal and installation Repair: Component-level repair instructions, including internal engine and transmission work Specifications: Torque specifications, clearances, fluid capacities, electrical resistance values Technical Depth Depth: Comprehensive, from basic fluid checks to complete engine and transmission rebuilds 📊 Manual Specifications File Format File Type: PDF Searchability: Searchable text content Print Quality Printability: Printable pages, allowing for hard copy use Binding Type Binding Type: N/A (Digital format) Paper Type Paper Type: N/A (Digital format) ⚙️ Engine Specifications Primary Engine Engine Type: 4-stroke, SOHC, 2-valve, single-cylinder Displacement: 348cc Bore X Stroke: 83.0 mm x 64.5 mm Cooling System: Liquid-cooled Performance Horsepower Estimate: Approximately 20-22 HP (at crankshaft, estimated) Torque Estimate: Approximately 20-22 lb-ft (at crankshaft, estimated) Fuel System Fuel Delivery: Carburetor Carburetor Model: Mikuni BSR33/1 Fuel Type: Unleaded gasoline Ignition Ignition System: Digital T.C.I. (Transistor Controlled Ignition) 🔧 Transmission Standard Transmission Type: Automatic (Yamaha Constant Velocity Transmission - Y.C.V.T.) Drive Modes: 2WD Features Gear Selection: Forward (High/Low), Neutral, Reverse Clutch Type: Wet, centrifugal, automatic 📐 Dimensions Weights Dry Weight: Approximately 234 kg (516 lbs) Fuel Capacity: 3.4 US gallons (13 Liters) Oil Capacity: 2.0 L (with filter change) 🛡️ Safety Features Ratings Atv Safety Considerations: Emphasis on safe riding practices, proper gear, and understanding vehicle limits. Not subject to automotive crash ratings. Active Features Braking System: Hydraulic disc brakes (front and rear) Passive Features Lighting: Halogen headlights, taillight, brake light 💡 Technology Features Infotainment Infotainment System: N/A (Basic ATV design) Driver Assistance Driver Assistance Features: N/A (Basic ATV design) Connectivity Connectivity Options: N/A (Basic ATV design) 🔧 Maintenance Service Intervals Initial Service: First service typically recommended at 100-200 miles or 1 month. Engine Oil Change: Every 100-200 hours or 6 months. Air Filter Cleaning: Inspect and clean every 20-40 hours, replace as needed. Spark Plug Replacement: Recommended every 100-200 hours or 1 year. Fluid Specifications Engine Oil Type: Yamalube 4 (or equivalent SAE 10W-40 API SE, SF, SG, SH, SJ, SL) Coolant Type: Permanent type antifreeze, ethylene glycol based (50/50 mix with distilled water recommended) Brake Fluid Type: DOT 3 or DOT 4 brake fluid Final Drive Oil Type: Yamalube Gear Oil (or equivalent SAE 80W-90 API GL-4) Known Issues Common Wear Items: Brake pads, tires, drive belts (CVT), wheel bearings. Potential Engine Issues: Carburetor tuning sensitivity, occasional cooling system leaks if not maintained. 📚 Vehicle History Brand Heritage Yamaha Atv Legacy: Yamaha...