The Grizzly 450 4WD, model designation YFM450FW, represents a robust and reliable option within the mid-size utility ATV segment. Produced between 2009 and 2013, this second-generation model is engineered for balanced performance, excelling in both work and recreational applications. Known for its off-road capability and durable construction, the Grizzly 450 is a favored choice for hobbyists, farmers, hunters, and trail riders seeking a dependable 4WD machine. Its 421cc liquid-cooled engine, coupled with the Ultramatic automatic transmission and On-Command 4WD system, provides a capable and user-friendly experience across various terrains. This comprehensive service repair manual offers detailed guidance for maintaining and repairing the Grizzly 450 4WD models from 2009 through 2013. Covering over 500 pages of information, it provides step-by-step procedures for engine overhaul, fuel system maintenance, transmission servicing, and electrical system diagnostics, including complete wiring diagrams. The manual also details chassis, suspension, and braking system repairs, along with drivetrain components and bodywork. It includes routine maintenance schedules, troubleshooting guides for common issues, essential torque specifications, and information on specialized tools, making it an indispensable resource for owners and technicians alike. 🏷️ Basic Information Identification Make: Yamaha Model: Grizzly 450 4WD Model Designation: YFM450FW Product Type: Service Repair Manual Generation Generation Code: 2nd Generation Grizzly 450 👋 Introduction Market Position Market Segment: Mid-size utility ATV segment. Competitive Analysis Key Competitors: Honda Foreman 450/500, Polaris Sportsman 450/500, Kawasaki Prairie 400/700, Suzuki King Quad 400/700, Arctic Cat 500. Key Features Performance Focus: Balanced performance for work and recreation, known for reliability and off-road capability. Target User: Hobbyists, farmers, hunters, trail riders seeking a durable and capable 4WD ATV. 📋 Manual Details Coverage Areas Covered Model Years: 2009, 2010, 2011, 2012, 2013 Covered Variants: All 4WD models Page Count Page Count Estimated: 500+ Manual Type Manual Type: Factory Service Manual / Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine System: Complete overhaul, troubleshooting, diagnostics, tuning, top-end rebuild, bottom-end rebuild, valve adjustments, cooling system, lubrication system. Fuel System: Carburetor adjustment and overhaul (Mikuni BSR42), fuel pump, fuel lines, fuel filter replacement. Transmission System: Automatic transmission (Ultramatic), gearbox inspection, clutch operation, drive shafts, differentials, maintenance procedures. Electrical System: Ignition system, charging system (stator, regulator/rectifier), battery, starter motor, lighting, wiring diagrams, fuses, relays, troubleshooting electrical faults. Chassis And Suspension: Frame inspection, front suspension (double A-arm, shocks, bushings), rear suspension (swingarm, shock, bushings), wheel bearings, steering system (handlebar, tie rods, steering stem). Braking System: Front and rear hydraulic disc brakes, brake pad replacement, brake fluid bleeding, master cylinder, calipers, brake lines. Drive Train: 4WD system operation, front differential, rear differential, drive shafts, universal joints, CV boots inspection and replacement. Body And Plastics: Fender removal and installation, panel alignment, seat removal, rack installation/removal. Procedures Included Routine Maintenance: Oil and filter changes, air filter cleaning/replacement, spark plug replacement, valve clearance checks, lubrication points, coolant checks and changes. Troubleshooting: Diagnostic charts for common problems, symptom-based troubleshooting guides for engine, electrical, and driveability issues. Repair Procedures: Step-by-step instructions for major component overhauls, component replacements, and system repairs. Assembly Disassembly: Detailed procedures for removing and installing all major assemblies and components with torque specifications. Wiring Diagrams: Comprehensive, color-coded electrical wiring schematics for all systems. Technical Depth Diagnostic Capabilities: Advanced diagnostic procedures, component testing, resistance and voltage checks. Rebuild Instructions: Complete engine and transmission rebuild instructions with internal component specifications. Torque Specifications: All critical fasteners and components have specified torque values. Special Tool Information: Identification and usage of specialized tools required for certain repair procedures. 📊 Manual Specifications File Format File Format: PDF Print Quality Print Quality: High-resolution, clear text and images suitable for printing. Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) Searchability Searchability: Searchable text for quick information retrieval. ⚙️ Engine Specifications Primary Engine Engine Type: 4-stroke, SOHC, 4-valve Engine Displacement: 421cc Bore X Stroke: 95.0 mm x 60.1 mm Compression Ratio: 9.2:1 Cooling System: Liquid-cooled Performance Horsepower Est: ~22-24 HP Torque Est: ~24-26 lb-ft Fuel System Fuel Delivery: Carburetor (Mikuni BSR42) Fuel Type: Unleaded gasoline, 87 octane (minimum) Ignition Ignition System: TCI (Transistor Controlled Ignition) 🔧 Transmission Standard Transmission Type: Yamaha Ultramatic Automatic Transmission with Engine Braking Drive Modes: 2WD, 4WD, 4WD with Differential Lock Features Belt Type: V-belt Gear Reduction: High/Low range, Neutral, Reverse 📐 Dimensions Exterior Length: 2085 mm (82.1 in) Width: 1110 mm (43.7 in) Height: 1150 mm (45.3 in) Wheelbase: 1270 mm (50.0 in) Ground Clearance: 260 mm (10.2 in) Weights Dry Weight Est: 278 kg (612.7 lbs) Towing Capacity: 600 kg (1322 lbs) Rack Capacity Front: 45 kg (99 lbs) Rack Capacity Rear: 85 kg (187 lbs) 🛡️ Safety Features Ratings Atv Safety Standards: Adheres to ANSI/SVIA 1-2010 and B71.1-2010 standards for ATVs. Active Features Engine Braking: Integrated engine braking system for controlled descents. 4Wd System: On-Command 4WD with differential lock for enhanced...