This manual covers the Yamaha YFM400 Kodiak 4x4 and YFM350 Bruin 4x2 all-terrain vehicles produced between 2004 and 2008. These versatile ATVs are engineered for a balance of utility and recreational performance, featuring robust chassis designs, reliable 348cc 4-stroke engines, and automatic transmission. The Kodiak 4x4 offers enhanced traction with its 4WD system and greater cargo and towing capabilities, making it ideal for demanding tasks. The Bruin 4x2 provides a user-friendly experience for lighter work and trail riding. Both models are recognized for their durability and adherence to ATV safety standards. This Factory Service/Repair Manual provides comprehensive English-language guidance for maintaining and repairing your ATV. It details critical maintenance procedures, including routine servicing, engine overhauls, transmission repairs, and brake system maintenance, along with troubleshooting guides for common and complex issues. Key systems covered include the engine, transmission, fuel system, electrical system, suspension, steering, and brakes, with specific instructions, diagrams, and technical specifications. This manual is an essential resource for owners and technicians aiming to ensure optimal performance, longevity, and safety of their YFM400 Kodiak or YFM350 Bruin. 🏷️ Basic Information Identification Make: Yamaha Model: YFM350 Bruin Generation Covered Years: 2004-2008 Codes Chassis Codes: YFM400: KODIAK 4X4; YFM350: BRUIN 4X2 👋 Introduction Market Position Category: All-terrain vehicles (ATVs) Target Audience: Yamaha ATV owners, DIY mechanics, service technicians Competitive Analysis Competitors: Honda (FourTrax, Rancher), Suzuki (KingQuad), Polaris (Sportsman), Kawasaki (Bayou, Brute Force) Key Features Manual Benefit 1: Provides OEM-level accuracy for repairs and maintenance. Manual Benefit 2: Enables owners to perform complex repairs, saving on service costs. Manual Benefit 3: Digital format offers convenient access and prevents damage to physical manuals. Manual Benefit 4: Lifetime protection policy for lost or damaged downloads. 📋 Manual Details Coverage Areas Models Covered: 2004-2008 Yamaha YFM350 Bruin 4x2 ATV, 2004-2008 Yamaha YFM400 Kodiak 4x4 ATV Page Count Estimated Page Count: Typically 300-500+ pages per model (specific count not provided, but typical for OEM service manuals) Manual Type Type: OEM Factory Service/Repair Manual Language Language: English Format Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine: Detailed engine overhaul, specifications, tuning, lubrication, cooling system Transmission: Clutch, gearbox, drive chain, sprockets, lubrication, maintenance Fuel System: Carburetor service, fuel pump, fuel lines, filters, specifications Electrical System: Ignition, starting system, charging system, lighting, wiring diagrams, troubleshooting Suspension: Front and rear shocks, forks, linkages, maintenance, adjustments Steering System: Handlebars, steering stem, tie rods, adjustments, troubleshooting Brakes: Hydraulic brake systems, caliper service, master cylinder, fluid specifications, bleeding procedures Bodywork Chassis: Frame, body panels, plastics, seat, fenders, removal, installation Exhaust Intake: Muffler, exhaust pipe, air filter, intake system maintenance Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug service, chain adjustment, lubrication points Engine Overhaul: Piston, cylinder, valve train, crankshaft, seals, gaskets, complete rebuild procedures Transmission Repair: Gearbox disassembly, reassembly, clutch inspection and replacement Electrical Troubleshooting: Diagnostic procedures, component testing, wiring harness repair, battery service Suspension Repair: Shock absorber servicing, fork seal replacement, general suspension component repair Brake System Service: Brake pad replacement, caliper servicing, bleeding, fluid replacement Carburetor Tuning: Adjustment, cleaning, rebuilding, jetting specifications Troubleshooting Guides: Systematic approaches to diagnose and resolve common and complex issues Technical Depth Depth: Comprehensive factory-level repair and maintenance information Detail Level: Step-by-step instructions, detailed diagrams, torque specifications, special tool requirements 📊 Manual Specifications File Format Format: PDF Searchability: Likely searchable text within the PDF for easy information retrieval Print Quality Quality: High-resolution digital reproduction of original factory manual content Binding Type Binding: Not applicable (downloadable PDF) Paper Type Paper Type: Not applicable (downloadable PDF) Usability Usability Features: Printable pages, accessible on multiple devices (smartphones, tablets, computers) ⚙️ Engine Specifications Primary Engine Yfm400 Engine Type: 4-stroke, SOHC, 4-valve Displacement: 348cc (for YFM400 Kodiak, often referred to as 400cc class) Primary Engine Yfm350 Engine Type: 4-stroke, SOHC, 4-valve Displacement: 348cc (for YFM350 Bruin, shares engine with YFM400 in this generation) Performance Bore X Stroke Yfm400 Yfm350: 83.0 mm x 64.5 mm Compression Ratio Yfm400 Yfm350: 9.2:1 Horsepower Estimate Yfm400 Yfm350: Approximately 20-23 HP (specific figures vary by year and tuning, but indicative) Torque Estimate Yfm400 Yfm350: Typically around 20-22 lb-ft Fuel System Carburetor Yfm400 Yfm350: Mikuni BSR33/BD-1 (Single Carburetor) Fuel Type: Unleaded gasoline (87 octane or higher recommended) Fuel Tank Capacity Yfm400 Yfm350: Approximately 3.8 US gal (14.5 L) Lubrication Oil Type Yfm400 Yfm350: Yamalube 4G 10W-40 (or equivalent API SG or higher, SAE 10W-40) Oil Capacity Yfm400 Yfm350: Approximately 2.04 US qt (1.9 L) with filter change Cooling System Type: Liquid-cooled Coolant Type: Yamaha-specific coolant (or equivalent 50/50 mix of ethylene glycol and de-ionized water) 🔧 Transmission Standard Type: Automatic (Yamaha Ultramatic® Transmission) Drive System Yfm400: On-Command® 4WD, shaft drive Drive System Yfm350: 2WD, shaft drive Features Gear Selection: High/Low range, Neutral, Reverse Clutch Type: Wet, multi-disc automatic centrifugal clutch Fluid Specifications Transmission Fluid Type: Yamalube 4G 10W-40 or equivalent API SG or higher, SAE 10W-40...