This manual covers the YFM350 Bruin Auto 4x4 and YFM400 Kodiak 4WD All-Terrain Vehicles (ATVs) from the 2003 through 2010 model years. These robust, 4-stroke, air-cooled ATVs are designed for utility and recreational off-road use, offering reliable performance and ease of operation with their automatic (CVT) transmissions and selectable 2WD/4WD systems. Engineered with renowned quality, these vehicles are built to handle various terrains and tasks, featuring substantial cargo rack capacity and dependable power delivery from their 348cc (YFM350) and 392cc (YFM400) engines. This comprehensive workshop service repair manual provides detailed information for owners, DIY mechanics, and professional technicians. It covers all essential aspects of maintenance, troubleshooting, and repair, including in-depth procedures for the engine, transmission, drivetrain, fuel system, electrical system, brakes, suspension, and steering. With over 500 pages of high-resolution, searchable content, this English-language manual offers step-by-step instructions for everything from routine maintenance and adjustments to complete engine and transmission overhauls, ensuring your ATV remains in optimal condition. 🏷️ Basic Information Identification Make: Yamaha Model: YFM350 Bruin / YFM400 Kodiak Type: ATV (All-Terrain Vehicle) Codes Engine Codes Covered: 3GD (YFM350), 3UU (YFM400) 👋 Introduction Market Position Target Audience: Owners, DIY mechanics, professional repair shops working on Yamaha YFM350 Bruin and YFM400 Kodiak ATVs. Competitive Analysis Value Proposition: Provides essential technical data, diagnostic procedures, and repair instructions to maintain and repair these popular Yamaha ATVs efficiently and cost-effectively. Key Features Manual Type Advantage: This is a workshop service manual, offering detailed repair and diagnostic information beyond an owner's manual. Download Convenience: Instant access via PDF download allows immediate use without waiting for physical delivery. 📋 Manual Details Coverage Areas Covered Years: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Covered Models: YFM350 Bruin Auto 4x4, YFM400 Kodiak 4WD Page Count Estimated Page Count: 500+ Manual Type Manual Type: Complete Workshop Service Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Complete engine overhaul, including cylinder head, piston, crankshaft, connecting rod, valve train, lubrication system, cooling system. Transmission: Automatic transmission (CVT), gear shifting mechanisms, final drive, differential, driveshafts, propeller shafts. Drivetrain: 4x4 system engagement, front differential, rear differential, driveshafts, CV joints, hub assembly. Fuel System: Carburetor (Mikuni BSR33/BSR34), fuel tank, fuel pump, fuel filter, fuel lines. Electrical System: Ignition system, charging system (stator, regulator/rectifier), battery, starter motor, lighting, wiring diagrams, fuses, relays, switches. Brakes: Hydraulic brake system, front and rear brake calipers, master cylinders, brake lines, brake pads, brake discs. Suspension: Front and rear suspension, shock absorbers, springs, control arms, ball joints, bushings, steering knuckle. Steering: Steering column, tie rods, steering rack, steering knuckles, steering wheel, U-joints. Cooling System: Radiator, cooling fan, water pump, coolant hoses, thermostat. Exhaust System: Exhaust manifold, muffler, exhaust pipe, heat shields. Body And Chassis: Frame, body panels, fenders, seat, handlebars, skid plates. Procedures Included Maintenance: Routine inspections, oil changes, filter replacements, spark plug replacement, brake adjustments, chain maintenance (if applicable). Troubleshooting: Diagnostic procedures for common problems, fault diagnosis, error code interpretation (if applicable). Repair: Detailed step-by-step instructions for component removal, disassembly, inspection, repair, reassembly, and installation. Overhaul: Complete engine and transmission rebuild procedures. Adjustments: Carburetor adjustment, valve clearance adjustment, clutch adjustment, brake adjustments. Wiring Diagrams: Comprehensive electrical system schematics for fault finding and repairs. Technical Depth Depth Of Coverage: Comprehensive from basic maintenance to complete engine and transmission rebuilds. 📊 Manual Specifications File Format File Type: PDF Print Quality Resolution: High-resolution, suitable for printing. Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) Searchability Text Searchability: Searchable text for easy navigation and information retrieval. ⚙️ Engine Specifications Primary Engine Engine Type: 4-stroke, SOHC, air-cooled Displacement Yfm350: 348cc Displacement Yfm400: 392cc Bore X Stroke Yfm350: 83.0 mm x 64.5 mm Bore X Stroke Yfm400: 86.0 mm x 69.0 mm Performance Horsepower Approx Yfm350: 21 HP @ 6500 RPM (est.) Horsepower Approx Yfm400: 23 HP @ 6000 RPM (est.) Torque Approx Yfm350: 20.3 lb-ft @ 5500 RPM (est.) Torque Approx Yfm400: 23.6 lb-ft @ 5000 RPM (est.) Fuel System Carburetor Model Yfm350: Mikuni BSR33 Carburetor Model Yfm400: Mikuni BSR34 Fuel Type: Unleaded gasoline, 87 octane or higher Fuel Tank Capacity Approx: 3.2 US gal 🔧 Transmission Standard Transmission Type: Automatic (CVT - Continuously Variable Transmission) Drive Modes: 2WD / 4WD Features Gear Selection: High, Low, Neutral, Reverse Final Drive: Shaft drive Fluid Type Transmission Fluid: Yamalube 4 (or equivalent SAE 10W-30 API SG or higher) ATV specific lubricant Fluid Capacity Transmission Fluid Capacity: 1.2 L (1.3 US qt) 📐 Dimensions Exterior Length Approx Yfm350: 76.2 in Width Approx Yfm350: 41.9 in Height Approx Yfm350: 44.1 in Wheelbase Approx Yfm350: 49.2 in Weights Dry Weight Approx Yfm350: 556 lbs Dry Weight Approx Yfm400: 595 lbs Cargo Front Rack Capacity Approx: 99 lbs Rear Rack Capacity Approx: 187 lbs Tires Front Tire Size: AT25x8-12 Rear Tire Size: AT25x10-12 Wheel Bolt Pattern:...