🏷️ Basic Information Identification Make: Yamaha Model: Bruin Model Variant: 350 / 400 Model Year: 2004 Vehicle Type: ATV (All-Terrain Vehicle) Codes Chassis Code: YFA125 (for reference, specific Bruin codes vary by sub-model) 👋 Introduction Market Position Market Position: The Yamaha Bruin was positioned as a reliable and capable utility ATV, catering to a wide range of users including recreational riders, farmers, and outdoorsmen. Its focus was on a balance of power, comfort, and durability. Competitive Analysis Competitive Analysis: Competed with models from Honda (e.g., FourTrax Foreman), Polaris (e.g., Sportsman), Kawasaki (e.g., Prairie), and Suzuki (e.g., KingQuad) in the mid-size utility ATV segment. Differentiated by its smooth power delivery, comfortable ride, and Yamaha's reputation for reliability. Key Features Key Features: Independent Front Suspension (IFS), shaft drive, selectable 2WD/4WD, automatic transmission (V-belt), powerful 4-stroke engine, comfortable seating. 📋 Manual Details Coverage Areas Coverage Areas: All Models Page Count Page Count: Hundreds of pages (precise count not specified, indicative of comprehensive content) Manual Type Manual Type: Service Repair Workshop Manual Language Language: English (Implied by product description and target market) Format Format: PDF Download 📖 Manual Coverage Systems Covered Systems Covered: Engine, Fuel System, Carburetion, Ignition System, Electrical System, Starting System, Charging System, Transmission, Clutch, Drivetrain, Suspension, Steering, Brakes, Chassis, Bodywork, Cooling System, Exhaust System, Frame, Wheels and Tires, Lubrication System, Troubleshooting Procedures Included Procedures Included: Routine Maintenance, Scheduled Servicing, Detailed Repair Procedures, Rebuilding, Refurbishing, Restoration, Diagnostic Procedures, Troubleshooting Faults, Component Replacement, Electrical Wiring Diagrams, Torque Specifications, Special Tool Requirements Technical Depth Technical Depth: Comprehensive, from basic adjustments to complete engine and transmission overhauls. Designed for DIY mechanics and professional technicians. 📊 Manual Specifications File Format File Format: Portable Document Format (PDF) Print Quality Print Quality: High-resolution, suitable for printing and digital viewing. Clear diagrams and text. Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: 4-stroke, SOHC, air-cooled (for 350) / liquid-cooled (for 400) Displacement: 348cc (for 350), 386cc (for 400 - exact variations may exist) Bore X Stroke: Specific to each engine variant (e.g., 83 mm x 64.5 mm for 350) Performance Horsepower: Approximately 20-25 HP (estimated, varies by specific model/tuning) Torque: Approximately 20-25 lb-ft (estimated, varies by specific model/tuning) Fuel System Fuel Delivery: Carburetor (e.g., Mikuni BSR33 for 350) Fuel Type: Unleaded gasoline Fuel Tank Capacity: Approx. 3.2 gallons (12 liters) Ignition System Ignition Type: CDI (Capacitor Discharge Ignition) Lubrication System Oil Type: Yamalube 4 (or equivalent 4-stroke motorcycle oil, SAE 10W-30 or 20W-40 recommended depending on temperature) Oil Capacity: Approx. 2.0-2.5 quarts (1.9-2.4 liters) with filter change Engine Management Timing: Specific valve and ignition timing specifications provided in the manual. 🔧 Transmission Standard Transmission Type: Automatic (V-belt transmission with torque converter) Drive System: Shaft drive Gear Selection: Forward (Hi/Lo range), Neutral, Reverse Clutch Type: Automatic centrifugal clutch Features Differential: Sealed rear differential, limited-slip front differential (on some models) Fluid Specifications Transmission Oil Type: Yamaha Slip-Resistant ATF or equivalent automatic transmission fluid Transmission Oil Capacity: Approx. 0.6 gallons (2.3 liters) 📐 Dimensions Exterior Overall Length: Approx. 76.5 inches (1945 mm) Overall Width: Approx. 42.5 inches (1080 mm) Overall Height: Approx. 43.1 inches (1095 mm) Wheelbase: Approx. 49.2 inches (1250 mm) Weights Dry Weight: Approx. 540-570 lbs (245-259 kg) Ground Clearance: Approx. 7.1 inches (180 mm) Cargo Front Rack Capacity: Approx. 88 lbs (40 kg) Rear Rack Capacity: Approx. 176 lbs (80 kg) Tires Front Tires: AT25x8-12 (e.g., Dunlop) Rear Tires: AT25x10-12 (e.g., Dunlop) Wheels Wheel Type: Steel Bolt Pattern: 4-bolt pattern (specific offset and bolt size detailed in manual) 🛡️ Safety Features Ratings Safety Ratings: ATVs are not typically crash-tested by organizations like NHTSA or IIHS. Safety relies heavily on operator skill and adherence to manufacturer guidelines. Active Features Braking System: Hydraulic disc brakes front and rear Parking Brake: Mechanical drum brake on rear axle (typically) Passive Features Lighting: Dual 30W headlights, 12V 5/21W taillight/brake light Operator Safety: Handlebar controls, footrests, thumb throttle with safety lever, engine kill switch, seat safety switch (on some models). 💡 Technology Features Infotainment Infotainment System: N/A (ATV technology focused on function, not typically equipped with infotainment systems) Driver Assistance Driver Assistance: N/A (Standard ATV design, basic controls) Connectivity Connectivity: N/A Engine Technology Engine Features: SOHC design for efficient valve operation, robust air/liquid cooling systems, reliable CDI ignition for consistent spark. Transmission Technology Transmission Features: Torque converter for smooth power delivery and automatic engagement, dual range (Hi/Lo) for varied terrain and towing needs. 🔧 Maintenance Service Intervals Initial Service: First service typically around 10-20 hours or 1 month (check oil, chain tension, air filter, etc.) Regular Maintenance: Engine oil and filter change: every 100 hours or 6 months. Air filter cleaning/replacement: every 20-40 hours. Spark plug inspection/replacement: every 100 hours or 1 year. Valve clearance check: every 200 hours or 1 year....