This manual covers the Yamaha YFM 350 Bruin, including its variants YFM350, YFM350AS, and YFM400, produced between 2003 and 2008. Known for its robust engineering and reliability, the Bruin is a versatile all-terrain vehicle designed for both utility and recreational purposes. Its 348cc air-cooled engine, coupled with a 5-speed semi-automatic Ultramatic transmission and an On-Command 2WD/4WD system, provides dependable performance for various terrains. Key features include substantial rack capacities for hauling, a towing capacity of up to 1,102 lbs, and hydraulic disc brakes for effective stopping power. This comprehensive factory service manual provides detailed guidance for owners, mechanics, and technicians. It covers all aspects of maintenance, from routine oil changes and filter replacements to complete engine overhauls and advanced diagnostics. The manual includes step-by-step repair instructions, exploded views, wiring diagrams, and specific troubleshooting procedures to address common and uncommon issues. By utilizing this manual, users can ensure the optimal performance, longevity, and safety of their Yamaha YFM 350 Bruin. 🏷️ Basic Information Identification Make: Yamaha Model: YFM 350 Bruin Model Variants Covered: YFM350, YFM350AS, YFM400 Generation Generation Years: 2003-2008 Codes Chassis Code: YFM350 👋 Introduction Market Position Target User: DIY enthusiasts, owners, professional technicians, mechanics, workshops. Competitive Analysis Manual Superiority: Original Yamaha manual, same as used by professionals, highly detailed, comprehensive coverage. Key Features Value Proposition: Save money by performing your own repairs, instant delivery, comprehensive troubleshooting and repair guidance. Content Highlight: Directly addresses fixing problems immediately, essential help guide for all repair and troubleshooting procedures. 📋 Manual Details Coverage Areas Covered Years: 2003, 2004, 2005, 2006, 2007, 2008 Page Count Estimated Page Count: Large file size, potentially up to 5GB. Specific page count not explicitly stated but implied to be comprehensive. Manual Type Type: Factory Service Manual / Repair Manual / Workshop Manual Language Language: English Format Delivery Format: Digital Download (PDF, potentially zipped) 📖 Manual Coverage Systems Covered Engine: Complete engine overhaul, teardown, assembly, diagnostics, repair. Cooling System: Radiator, fan, thermostat, coolant flow, pressure testing. Fuel System: Fuel injection system components, fuel pump, injectors, pressure regulator, troubleshooting. Electrical System: Ignition system, charging system, lighting, starter, battery, fuses, wiring diagrams. Chassis: Frame, suspension (front and rear), steering, wheels, tires, brakes. Drivetrain: Transmission, drive shafts, differentials (if applicable), final drive. Bodywork: Body panels, plastics, seat, handle bars. Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, lubrication, adjustments. Troubleshooting: Diagnostic procedures for common and uncommon issues, fault codes, symptom-based troubleshooting. Repair: Step-by-step repair instructions for all major and minor components, rebuild procedures. Restoration: Guidance for restoring components and the overall ATV. Diagnostics: Detailed diagnostic flowcharts and component testing procedures. Technical Depth Depth: Comprehensive; covers everything from basic maintenance to complete engine rebuilds and advanced diagnostics. Illustrations: Illustrated with clear step-by-step instructions, zoomable illustrations, detailed component explosions, exploded views. Part Information: Breakdowns of all part numbers for all aspects of the ATV. 📊 Manual Specifications File Format Format: PDF (Portable Document Format), may be zipped (.zip, .rar) Compatibility: Compatible with all operating systems (Windows, Linux, Mac) and PDF readers. Download Access: Instant download after payment, with a three-day window for downloading. Print Quality Printability: Printable on any computer and printer. No restrictions on printing. Binding Type Binding: Not applicable (digital download). Paper Type Paper Quality: Not applicable (digital download). ⚙️ Engine Specifications Primary Engine Engine Type: 4-stroke, SOHC, air-cooled Displacement: 348cc (for YFM350 Bruin) Bore X Stroke: 83.0 mm x 64.5 mm Compression Ratio: 9.2:1 Performance Horsepower: Approx. 21.1 HP @ 6,500 RPM (estimated for 350cc engine) Torque: Approx. 20.7 lb-ft @ 5,500 RPM (estimated for 350cc engine) Fuel System Fuel Delivery: Mikuni BSR33 carburetor (for some models) or Electronic Fuel Injection (EFI) on later/specific variants. Fuel Type: Unleaded gasoline (87 octane or higher recommended) Fuel Capacity: Approximately 3.2 gallons (12.2 liters), including a 0.7-gallon reserve. Cooling System Cooling Method: Air-cooled with an oil cooler. 🔧 Transmission Standard Transmission Type: 5-speed semi-automatic (Ultramatic with automatic engine braking) Optional Optional Transmission: Not applicable for this model, standard configuration. Features Drive System: Shaft drive, 2WD/4WD with On-Command system. Gear Selection: 1, 2, 3, 4, 5, Neutral, Reverse. Fluid Specifications Transmission Fluid Type: Yamaha Marine Lubricant (Yamalube) 10W-40 or equivalent ATV/UTV transmission oil. 📐 Dimensions Exterior Overall Length: Approximately 74.2 inches (1885 mm) Overall Width: Approximately 43.1 inches (1095 mm) Overall Height: Approximately 43.7 inches (1109 mm) Weights Dry Weight: Approximately 487 lbs (221 kg) Ground Clearance: Approximately 7.1 inches (180 mm) Cargo Rack Capacity Front: Approximately 99 lbs (45 kg) Rack Capacity Rear: Approximately 176 lbs (80 kg) Towing Towing Capacity: Approximately 1,102 lbs (500 kg) 🛡️ Safety Features Ratings Rollover Protection: No integrated rollover protection system (ROPS) as standard for ATVs of this era. Active Features Braking System: Hydraulic disc brakes (front and rear), sealed drum brake (rear parking). Passive Features Lighting: Dual 30W Krypton headlights, 8W taillight/stoplight. Ergonomics: Comfortable seating position,...