🏷️ Basic Information Identification Make: Yamaha Model: Bruin 350 Model Code: YFM350 Model Variant: 2WD / 4WD Generation Generation Designation: First Generation (2004-2006) Codes Chassis Code: YFM350 Engine Code: YFM350 👋 Introduction Market Position Segment: Mid-size utility ATV Target Audience: Recreational riders, farmers, utility users. Competitive Analysis Key Competitors: Honda FourTrax 350, Polaris Sportsman 400/500, Suzuki King Quad 300/350, Kawasaki Bayou 300. Key Features Engine Type: Air-cooled, 4-stroke, SOHC, 2-valve. Transmission Type: Automatic (Ultramatic) with forward, neutral, reverse. Drivetrain Options: Shaft drive, available in 2WD and 4WD. Suspension: Independent front suspension, swingarm rear suspension. 📋 Manual Details Coverage Areas Applicable Years: 2004, 2005, 2006 Vehicle Types: All-Terrain Vehicle (ATV) Powertrain Variants: 2WD and 4WD models Page Count Estimated Pages: Hundreds (Specific count not provided, but typical for a comprehensive service manual) Manual Type Type: Service Repair Workshop Manual Language Language: English Format Format: PDF (Digital Download) 📖 Manual Coverage Systems Covered Engine Mechanical: Full engine overhaul, top-end and bottom-end components, piston, rings, valves, camshaft, crankshaft, cylinder head, cylinder block. Fuel System: Carburetor (Mikuni BSR33) specifications, jetting, cleaning, adjustment, fuel pump, fuel tank, fuel lines. Ignition System: CDI unit, ignition coils, spark plug specifications, timing, troubleshooting. Cooling System: Radiator, fan, thermostat, coolant specifications, flushing, bleeding procedures. Transmission: Automatic transmission (Ultramatic), gear shifting mechanism, oil specifications, internal components, service. Drivetrain: Shaft drive, differentials (front and rear), CV joints, drive shafts, propeller shafts, final drive oil specifications. Suspension: Front and rear suspension systems, shock absorbers, springs, bushings, adjustment, rebuilding. Brakes: Hydraulic brake system, front and rear disc brakes, brake calipers, master cylinders, brake lines, brake fluid specifications, bleeding procedures, pad replacement. Electrical System: Wiring diagrams, battery specifications, starter motor, alternator/stator, lighting system, switches, fuses, relays, troubleshooting. Steering: Steering system components, tie rods, steering knuckles, grease points, adjustments. Frame And Body: Frame inspection, chassis components, body panels, fenders, rack assembly, seating. Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug maintenance, air filter cleaning/replacement, lubrication points, tire pressure checks. Troubleshooting: Systematic diagnostic procedures for common and uncommon issues, fault codes (if applicable), symptom-based troubleshooting. Engine Repair: Complete engine teardown, inspection, reassembly, and tuning. Valve adjustments, decarbonizing. Transmission Service: Transmission fluid service, seal replacement, clutch adjustments (if applicable for automatic). Brake System Service: Brake fluid flush and bleed, pad and rotor replacement, caliper service. Electrical Diagnostics: Use of multimeters, testing circuits, identifying shorts and open circuits, component testing. Suspension And Steering Repair: Ball joint replacement, tie rod end replacement, shock absorber service, wheel alignment checks. Technical Depth Depth: Comprehensive, covering from basic maintenance to complete engine and transmission overhauls. Detail Level: Includes detailed torque specifications, component tolerances, measurement values, and step-by-step repair instructions. Illustrations: Likely includes diagrams, schematics, and photographic illustrations for clarity. 📊 Manual Specifications File Format File Type: PDF Searchability: Typically search-enabled text within the PDF for quick information retrieval. Printability: Printable pages for workshop use. Print Quality Quality: High resolution for clear diagrams and text. Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: 4-stroke, SOHC, 2-valve, single-cylinder Displacement: 348 cc (21.2 cu. in.) Bore X Stroke: 83 mm x 64.5 mm (3.27 in x 2.54 in) Cooling System: Air-cooled with fan assist Compression Ratio: 9.2:1 Carburetor: Mikuni BSR33, single Starter System: Electric starter Oil Type: Yamalube 4 (or equivalent) 10W-40, API SG or higher, JASO MA Oil Capacity: 2.20 L (2.3 US qt) with oil filter change Performance Horsepower: Approximately 21 HP @ 6000 RPM (Estimated, not officially published in all specs) Torque: Approximately 27 Nm (19.9 lb-ft) @ 5000 RPM (Estimated) Fuel System Fuel Type: Unleaded gasoline (91 octane or higher recommended) Fuel Tank Capacity: 12.0 L (3.2 US gal) 🔧 Transmission Standard Type: Automatic (Yamaha Ultramatic) Gear Selection: Forward (Hi/Lo range), Neutral, Reverse Drive System: Shaft drive Features Engine Braking: Features strong engine braking due to the Ultramatic design. Final Drive Oil Type: Yamalube Gear Oil (or equivalent) SAE 80 API GL-4 Final Drive Oil Capacity: 0.22 L (0.23 US qt) 📐 Dimensions Exterior Length: 1990 mm (78.3 in) Width: 1065 mm (41.9 in) Height: 1165 mm (45.9 in) Wheelbase: 1285 mm (50.6 in) Ground Clearance: 180 mm (7.1 in) Weights Dry Weight: 260 kg (573 lbs) for 4WD model; 250 kg (551 lbs) for 2WD model Curb Weight: Approximately 270-280 kg (595-617 lbs) depending on configuration. Cargo Front Rack Capacity: 40 kg (88 lbs) Rear Rack Capacity: 80 kg (176 lbs) 🛡️ Safety Features Ratings Atv Safety Standards: Designed to meet ANSI/SVIA standards for recreational ATVs. Active Features Braking System: Hydraulic disc brakes front and rear for reliable stopping power. Lighting: Dual 30W headlights, 8W taillight/brake light for visibility. Passive Features Ergonomics: Designed with rider comfort and control in mind, including handlebar grips and control placement. Guarding: Footwells and guards to protect rider from debris and moving...