The Bruin 350 4x2 is a mid-size, rear-wheel-drive All-Terrain Vehicle (ATV) produced from 2004 to 2006. This first-generation model features an air-cooled, 4-stroke, SOHC single-cylinder engine displacing 348cc, paired with an automatic Continuously Variable Transmission (CVT) offering forward (Hi/Lo), neutral, and reverse gears. Known for its reliability and ease of use, the Bruin 350 is well-suited for trail riding and light utility tasks. Its design includes independent front suspension for enhanced comfort and hydraulic disc brakes on both the front and rear for effective stopping power. This comprehensive service manual provides detailed information for the repair, service, maintenance, troubleshooting, and diagnosis of the Bruin 350 4x2. It covers all major systems, including the engine, transmission, drivetrain, chassis, suspension, steering, braking, and electrical systems, with step-by-step instructions, technical specifications, and diagnostic procedures. The manual is an essential resource for owners, mechanics, and technicians seeking to maintain the optimal performance and longevity of their vehicle, offering expert-level guidance for a wide range of maintenance and repair tasks. 🏷️ Basic Information Identification Make: Yamaha Model: Bruin 350 4x2 Model Years Covered: 2004, 2005, 2006 Vehicle Type: All-Terrain Vehicle (ATV) Drive Type: 4x2 (Rear-wheel drive) Generation Generation Designation: First Generation 👋 Introduction Market Position Atv Segment: Mid-size utility ATV, popular for trail riding and light work Competitive Analysis Key Competitors: Honda FourTrax 350, Polaris Sportsman 330/350, Arctic Cat 300/350 Key Features Engine Type: Air-cooled, 4-stroke, SOHC, single-cylinder engine Transmission Type: Automatic (CVT-style) transmission with forward, neutral, and reverse gears Suspension Type: Independent front suspension (IFS) for improved ride comfort and handling Braking System: Hydraulic disc brakes front and rear Drive System: Shaft drive, 2WD (4x2) 📋 Manual Details Coverage Areas Manual Coverage Scope: Comprehensive (Repair, Service, Maintenance, Troubleshooting, Restoration, Diagnosis) Page Count Estimated Page Count: Not Specified (Digital Download, size up to 5GB) Manual Type Manual Type: Service Manual, Workshop Manual, Repair Manual, Owner's Manual Language Language: English Format Digital Format: PDF (Downloadable) 📖 Manual Coverage Systems Covered Engine Systems: Engine removal/installation, cylinder head, valve train, piston, crankshaft, lubrication system, cooling system, starting system, ignition system, carburetor overhaul and adjustment, fuel system, exhaust system Transmission Drivetrain Systems: Transmission overhaul, gearbox, final drive, drive shafts, clutch operation and adjustment, automatic transmission service (if applicable) Chassis Suspension Steering Systems: Front suspension (A-arms, shocks, steering knuckles), rear suspension (swingarm, shock), steering system (handlebar, steering shaft, tie rods), wheel bearing service, hub assembly Braking Systems: Hydraulic brake system, brake caliper service, master cylinder overhaul, brake pad replacement, brake fluid specifications and bleeding procedures Electrical Systems: Wiring diagrams, lighting system, starting and charging system (stator, regulator/rectifier, battery), ignition system, fuses, relays, switches, electronic control unit (ECU) diagnosis (if applicable) Fuel System: Fuel tank removal/installation, fuel pump operation, carburetor cleaning and adjustment, fuel filter replacement Cooling System: Radiator service, fan operation, coolant specifications and capacity, water pump inspection and replacement Body Frame: Body panel removal and installation, frame inspection and repair (if applicable) Procedures Included Maintenance Procedures: Routine checks, fluid level checks and top-ups, lubrication points, air filter cleaning/replacement, spark plug inspection and replacement, chain adjustment (if applicable) Troubleshooting Procedures: Diagnostic charts for common problems (e.g., starting issues, engine performance, electrical faults), symptom-based troubleshooting guides Repair Procedures: Step-by-step instructions for component disassembly, overhaul, and reassembly for all major systems Restoration Rebuilds: Detailed guidance for comprehensive engine rebuilds, transmission overhauls, and component restoration Technical Depth Technical Depth Level: Expert-level (Suitable for professional technicians and advanced DIY enthusiasts) Diagnostic Capabilities: Detailed diagnostic procedures, electrical schematics, component testing methods Specifications Tolerances: Precise specifications for all adjustable components, wear limits, torque values, and measurement tolerances 📊 Manual Specifications File Format File Format Details: Adobe PDF (.pdf), may be zipped (.zip) requiring extraction with WinZip or WinRAR Print Quality Print Save Options: Printable, savable to any device (computer, tablet, etc.), no printing restrictions Binding Type Binding Type: Not Applicable (Digital Download) Paper Type Paper Type: Not Applicable (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Displacement: 348cc Engine Type: Air-cooled, 4-stroke, SOHC, 2-valve Bore X Stroke: 83 mm x 64.5 mm Compression Ratio: 9.2:1 Carburetor Model: Mikuni BSR33/1, 33mm constant velocity Ignition System: CDI (Capacitor Discharge Ignition) Starting System: Electric starter Performance Horsepower: Approximately 20-22 HP (estimated, actual figures may vary) Torque: Not specified in product info (typically around 20-22 lb-ft) Fuel System Fuel Type: Unleaded gasoline Fuel Tank Capacity: 3.2 US gal (12 L) including reserve 🔧 Transmission Standard Transmission Type: Automatic Continuously Variable Transmission (CVT) Gear Selection: Forward (Hi/Lo), Neutral, Reverse Features Drive Engagement: Automatic centrifugal clutch Final Drive: Shaft drive to rear wheels 📐 Dimensions Exterior Length: 75.2 in (1910 mm) Width: 42.1 in (1070 mm) Height: 44.1 in (1120 mm) Wheelbase: 49.2 in (1250 mm) Weights Dry Weight: 549 lbs (249 kg) Curb Weight: Not specified (typically ~570-580 lbs with fluids) Ground Clearance: 10.5 in (267 mm) 🛡️ Safety Features Ratings...