This manual covers the utility all-terrain vehicles, produced between 2004 and 2006. Known for their reliable engines, selectable 4WD, and comfortable independent front suspension, these ATVs are designed for a range of uses, from recreational riding to property management and agricultural tasks. The Bruin series emphasizes a balance of capability and user-friendliness, making it a dependable choice for various demanding applications. This comprehensive workshop repair manual provides in-depth guidance for the repair, maintenance, and restoration of your vehicle. It details procedures for all major systems, including the engine, transmission, drivetrain, brakes, suspension, steering, and electrical components. With clear, step-by-step instructions, detailed illustrations, and factory specifications, this manual is an essential resource for owners and technicians aiming to keep their vehicle in optimal condition and ensure its longevity. 🏷️ Basic Information Identification Make: Yamaha Model: Bruin 350 / Bruin 400 Model Variants: 350, 400 Production Years Covered: 2004, 2005, 2006 Generation Generation Code: YFM350X (350), YFM400K (400) 👋 Introduction Market Position Vehicle Segment: Utility All-Terrain Vehicle (ATV) Target Audience: Recreational riders, utility users, property owners, agricultural use. Competitive Analysis Key Competitors: Honda FourTrax, Polaris Sportsman, Arctic Cat 400/500, Suzuki King Quad, Kawasaki Bayou/Prairie. Key Features Features: Reliable Yamaha engine, selectable 4WD, automatic transmission, independent front suspension, comfortable seating. 📋 Manual Details Coverage Areas Overall Coverage: Comprehensive repair, maintenance, restoration, and diagnosis System Coverage Summary: Engine, transmission, chassis, electrical, bodywork, suspension, steering, brakes, fuel system, cooling system, exhaust system, drivetrain. Page Count Estimated Page Count: High, likely 500+ pages (based on typical workshop manuals and file size mention) Manual Type Type: Workshop Repair Manual Origin: Original Manufacturer (Yamaha) Language Language: English (implied by product description, typical for international manuals) Format Digital Format: PDF Download File Size Potential: Up to 5 GB 📖 Manual Coverage Systems Covered Engine: Complete engine overhaul, internal component specifications, timing, ignition, lubrication, cooling, fuel delivery, emissions. Transmission: Automatic transmission (CVT) disassembly, assembly, adjustments, fluid specifications, troubleshooting. Drivetrain: Driveshaft, differential (front/rear), 4WD system engagement, wheel hubs, CV joints. Brakes: Hydraulic system, brake caliper servicing, pad replacement, bleeding procedure, master cylinder, parking brake. Suspension: Front and rear suspension components, shock absorbers, springs, bushings, alignment specifications. Steering: Handlebar assembly, steering shaft, tie rods, steering knuckle servicing, lubrication. Electrical: Wiring diagrams, lighting system, starting system, charging system (alternator/stator), battery maintenance, fuses, relays, ignition system components. Fuel System: Carburetor (Mikuni BSR33), fuel tank, fuel pump, fuel lines, filters, choke operation. Cooling System: Radiator, fan, coolant, thermostat, water pump, hose replacement. Exhaust System: Muffler, exhaust pipe, heat shields, inspection, replacement. Body And Chassis: Frame inspection, body panels, plastics, seat removal, fender maintenance, rack installation. Procedures Included Maintenance: Regular servicing, oil changes, filter replacements, lubrication points, valve adjustments, spark plug replacement. Repair: Component removal, installation, replacement, and adjustment for all covered systems. Troubleshooting: Diagnostic charts, symptom analysis, root cause identification for common problems. Rebuilding: Detailed instructions for engine and transmission rebuilds. Diagnostics: Electrical system diagnostics, fuel system checks, engine performance analysis. Specifications: Torque values, clearances, fluid capacities, electrical resistance, engine specifications. Technical Depth Depth: Factory-level detail suitable for professional technicians and advanced DIY users. Illustrations: Clear, step-by-step illustrated instructions, exploded views, zoomable illustrations. Component Breakdowns: Detailed breakdowns of all major and minor components. Part Identification: Detailed breakdown of all part numbers for every aspect of the vehicle. 📊 Manual Specifications File Format Format: PDF Searchability: Likely text-searchable within the PDF document. Print Quality Print Ability: Printable from any computer and printer. Illustration Quality: High quality, designed for clarity and detail. Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) Delivery Delivery Method: Instant Digital Download Download Window: Three days after payment Support: Free support available for download issues. ⚙️ Engine Specifications Primary Engine Engine Type 350: 4-stroke, SOHC, 2-valve, single cylinder Engine Type 400: 4-stroke, SOHC, 4-valve, single cylinder (often a variant of the Raptor 350/660 engine architecture, but 400cc) Bore X Stroke 350: 81.0 mm x 81.2 mm Bore X Stroke 400: 84.0 mm x 70.0 mm (approximate, specific to Bruin 400) Displacement 350: 348cc Displacement 400: 386cc (approximate, specific to Bruin 400) Cooling System: Liquid-cooled Performance Horsepower 350: Approx. 21 HP @ 6500 RPM Torque 350: Approx. 20 lb-ft @ 5500 RPM Horsepower 400: Approx. 23 HP @ 6000 RPM Torque 400: Approx. 25 lb-ft @ 5000 RPM Fuel System Fuel Delivery: Carburetor (Mikuni BSR33, single) Fuel Type: Unleaded gasoline (87 octane recommended) Fuel Tank Capacity: 3.7 gallons (14 L) Ignition Ignition System: CDI (Capacitor Discharge Ignition) Engine Components Spark Plug 350: NGK CR6HSA or Denso U20FS-U Spark Plug 400: NGK CR7HSA or Denso U22FS-U (likely) 🔧 Transmission Standard Type: Automatic (CVT - Constant Variable Transmission) with reverse Drive System: Shaft Drive Features Drive Modes: 2WD / 4WD (selectable, often push-button on handlebars) Transmission Fluid Spec: Yamaha Genuine ATF Type-III or equivalent DEXRON-III compatible fluid Transmission Fluid Capacity: Refer to...