This manual covers the models produced for the 2003 through 2006 model years for one and 2007 through 2011 model years for the other. These versatile all-terrain vehicles are equipped with a 348cc, air-cooled, 4-stroke engine featuring a SOHC, 2-valve configuration and fan-assist cooling. Known for a reputation for engineering quality and reliability, these ATVs are designed for a range of off-road activities, offering a robust platform for work or recreation. Key technological features include the automatic transmission and the 4WD system, enhancing both performance and rider control. This comprehensive service manual provides detailed information essential for the maintenance and repair of your ATV. It covers critical systems including the engine, fuel system, cooling system, drivetrain, chassis, suspension, steering, and electrical components. Within its 481 pages, you will find step-by-step instructions, diagnostic procedures, and repair guidelines, supported by detailed diagrams, illustrations, and exploded views. This manual is designed to empower do-it-yourself mechanics and owners to perform everything from routine maintenance, such as oil changes and filter cleaning, to complex repairs, ultimately saving time and money on servicing. 🏷️ Basic Information Identification Make: Yamaha Model: Bruin YFM350 / Grizzly YFM350 Model Variant: 4WD Model Years Covered: 2003, 2004, 2005, 2006 (Bruin YFM350); 2007, 2008, 2009, 2010, 2011 (Grizzly YFM350) Engine Type: 4-stroke, SOHC, 2-valve, Air-cooled with Fan Assist Codes Manual Part Number: LIT-11616-BN-35 Yamaha Tech Pubs Reference: Recommended for 2003, 2004-2007 for listed models 👋 Introduction Market Position Target Audience: Do-it-yourself mechanics, ATV enthusiasts, owners seeking to save on dealer labor costs. Competitive Analysis Value Proposition: Offers significant cost savings compared to dealer service rates (estimated $70+ per hour labor). Key Features Accessibility: Instant PDF download provides immediate access to repair information. Practicality: Empowers owners to perform routine maintenance and repairs themselves, fostering self-sufficiency. 📋 Manual Details Coverage Areas Primary Coverage: 2003-2006 Yamaha Bruin YFM350 4WD; 2007-2011 Yamaha Grizzly YFM350 4WD Supplementary Coverage: Bruin 350 models supplement begins on page 367, indicating potential base manual reference for 450 models, as per Yamaha tech pubs. Page Count Total Pages: 481 Manual Type Type: Complete Service Manual Language Language: English Format File Format: PDF Digital Delivery: Instant Download Printability: All pages printable 📖 Manual Coverage Systems Covered Engine Management: Fuel System, Cooling System, Engine Top End, Engine Lubrication System, Crankshaft/Crankcase Drivetrain: Transmission, Final Drive Chassis And Suspension: Wheels/Tires, Suspension, Steering, Frame Electrical: Electrical System Procedures Included Maintenance: Periodic Maintenance Diagnostics: Diagnostics Repair: Engine Removal/Installation, Crankshaft/Crankcase, Transmission, Wheels/Tires, Final Drive, Brakes, Suspension, Steering, Frame, Electrical System repairs Technical Depth Depth Level: Comprehensive, covering all repair topics from basic maintenance to detailed diagnostics and rebuild procedures. Visual Aids: Detailed Diagrams, Illustrations, Photos, Exploded Views Instruction Style: Step-by-step Instructions 📊 Manual Specifications File Format Required Software: Adobe PDF Reader Compatibility: All Versions of Windows & Mac Print Quality Quality: High-resolution, suitable for printing all pages. Binding Type Binding Type: Not Applicable (Digital Download) Paper Type Paper Type: Not Applicable (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Displacement: 348cc (for both Bruin YFM350 and Grizzly YFM350) Engine Configuration: Single Cylinder Valvetrain: SOHC, 2-valve Cooling System: Air-cooled with Fan Assist Performance Horsepower Estimate: Approximately 17-20 HP (typical for this displacement and configuration, exact figures would be in manual) Torque Estimate: Approximately 20-23 lb-ft (typical for this displacement and configuration, exact figures would be in manual) Fuel System Fuel Delivery: Carburetor (likely Mikuni BSR series, e.g., BSR33, specific details in manual) Fuel Type: Unleaded Gasoline 🔧 Transmission Standard Transmission Type: Automatic (Yamaha Ultramatic® Transmission) Drive System: Shaft Drive, 4WD with On-Command® Features Gear Selection: High/Low range, Neutral, Reverse 📐 Dimensions Exterior Overall Length: Refer to manual for exact specifications, typically around 75-80 inches. Overall Width: Refer to manual for exact specifications, typically around 43-45 inches. Overall Height: Refer to manual for exact specifications, typically around 43-45 inches. Weights Dry Weight: Refer to manual for exact specifications, typically around 550-570 lbs. Fuel Capacity: Refer to manual for exact specifications, typically around 3.7 gallons. 🛡️ Safety Features Ratings Atv Safety: ATVs are inherently designed for off-road use; safety relies heavily on operator skill, adherence to warnings in the manual, and appropriate safety gear. Active Features Braking System: Hydraulic disc brakes (front and rear), detailed in manual. Passive Features Stability: Wide wheelbase and low center of gravity for enhanced stability. 💡 Technology Features Infotainment Features: Basic instrumentation: speedometer, odometer, hour meter, fuel gauge, neutral/reverse/4WD indicators. No advanced infotainment systems typical of modern vehicles. Driver Assistance Features: Yamaha's Ultramatic® transmission provides engine braking on descents. On-Command® 4WD system allows on-the-fly engagement. Connectivity Features: N/A (No inherent connectivity features). 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 100 hours or annually, consult manual for specific recommendation. Air Filter Cleaning: Frequent inspection and cleaning recommended, especially in dusty conditions; replacement intervals specified in manual. Spark Plug Replacement: Refer to manual for interval and...