🏷️ Basic Information Identification Make: Yamaha Model: YFM400 Big Bear Model Code: YFM400FWA(M) Vehicle Type: All-Terrain Vehicle (ATV) Generation Generation Designation: Fourth Generation Big Bear Codes Chassis Code: YFM400FWA(M) 👋 Introduction Market Position Atv Segment: Utility ATV Target User: Recreational riders, hunters, farmers, and those needing a dependable workhorse. Competitive Analysis Key Competitors: Honda Foreman, Kawasaki Prairie, Polaris Sportsman. Key Features Model Highlights: Known for its ruggedness, reliability, selectable 4WD, and comfortable ride. Manual Value Proposition: Provides the essential technical knowledge for owners and technicians to maintain and repair the YFM400 Big Bear, ensuring longevity and optimal performance. 📋 Manual Details Coverage Areas Manual Title: ATV Yamaha YFM400 Bigbear (YFM400FWA(M)) Complete Factory Service / Repair / Workshop Manual Manual Scope: Complete Factory Service, Repair, and Workshop Page Count Estimated Page Count: Approximately 500+ pages (based on typical factory manuals for this era and complexity) Manual Type Manual Type: Factory Service Manual / Workshop Manual Language Language: English Format Digital Format: PDF Download 📖 Manual Coverage Systems Covered Engine Systems: Engine overhaul, disassembly, assembly, lubrication, cooling system, ignition system, fuel system (carburetor tuning and maintenance), exhaust system, emissions control. Transmission Drivetrain: Automatic transmission (CVT), gearcase, drive shafts, differentials (if applicable), clutches, maintenance, and repair procedures. Chassis Suspension: Frame inspection and repair, front and rear suspension (A-arms, shocks, bushings), steering system (handlebar, steering shaft, tie rods). Braking System: Front and rear brake calipers, master cylinders, brake lines, hydraulic fluid specifications, bleeding procedures, pad replacement, rotor inspection. Electrical System: Wiring diagrams, battery maintenance, charging system (stator, rectifier/regulator), lighting system (headlights, taillights, indicators), starting system (starter motor, solenoid), CDI unit, sensors. Bodywork Plastics: Fender removal and installation, seat removal, fuel tank and shroud maintenance, handlebar assembly, grip replacement. Procedures Included Routine Maintenance: Oil and filter changes, air filter cleaning/replacement, spark plug replacement, lubrication points, chain/belt adjustment (if applicable), brake adjustments. Troubleshooting: Diagnostic charts, common problem identification (e.g., starting issues, poor performance, electrical faults), symptom-based troubleshooting guides. Repair Overhaul: Detailed step-by-step instructions for component disassembly, inspection, repair, and reassembly of major systems like the engine, transmission, and suspension. Special Tools: Identification and usage of specialized tools required for specific repair procedures. Technical Depth Diagnostic Capabilities: Advanced diagnostics for engine performance issues, electrical system faults, and drivetrain problems. Rebuild Procedures: Comprehensive guides for full engine rebuilds, transmission overhauls, and suspension component replacement. Specifications Tolerances: Precise technical data including torque specifications, clearances, tolerances, fluid capacities, and electrical resistance values. 📊 Manual Specifications File Format File Format: PDF Print Quality Image Resolution: High resolution for clear diagrams and text. Text Searchability: Searchable text for quick information retrieval. Binding Type Binding Type Digital: N/A (Digital PDF) Paper Type Paper Type Digital: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Type: 4-stroke, SOHC, air-cooled Displacement: 387 cc Bore X Stroke: 82.0 mm x 71.5 mm Compression Ratio: 8.8:1 Valve Clearance Intake Cold: 0.09 - 0.14 mm (0.0035 - 0.0055 in) Valve Clearance Exhaust Cold: 0.12 - 0.17 mm (0.0047 - 0.0067 in) Performance Horsepower Estimated: Approx. 21 HP @ 5500 RPM (Industry standard, specific Yamaha figures may vary slightly) Torque Estimated: Approx. 24 lb-ft @ 4000 RPM (Industry standard, specific Yamaha figures may vary slightly) Fuel System Fuel Delivery: Carburetor Carburetor Model: Mikuni BSR33/1 Fuel Type: Unleaded gasoline Fuel Octane Rating: 87 AKI (Octane Rating) Fuel Tank Capacity: 13.5 L (3.57 gal) Lubrication Engine Oil Type: Yamalube 4 (or equivalent SAE 10W-40, API SG or higher) Engine Oil Capacity W Filter: 2.20 L (2.32 US qt) Engine Oil Capacity Wo Filter: 2.00 L (2.11 US qt) Cooling System Cooling Method: Air-cooled Ignition System Ignition System: CDI (Capacitor Discharge Ignition) Spark Plug Type: NGK CR6HSA / DENSO U20FSR-U Spark Plug Gap: 0.6 - 0.7 mm (0.024 - 0.028 in) 🔧 Transmission Standard Transmission Type: Automatic Continuously Variable Transmission (CVT) Drive System: Shaft drive, Selectable 4WD with 2WD/4WD switch Features Gear Reduction Ratio Low: 3.596:1 Gear Reduction Ratio High: 2.888:1 Final Drive: Bevel gear and drive shaft Fluid Specifications Gearcase Oil Type: Yamalube Gear Oil (or SAE 80 hypoid gear oil) Fluid Capacities Gearcase Oil Capacity: 0.42 L (0.44 US qt) 📐 Dimensions Exterior Length: 2030 mm (79.9 in) Width: 1095 mm (43.1 in) Height: 1170 mm (46.1 in) Wheelbase: 1280 mm (50.4 in) Ground Clearance: 250 mm (9.8 in) Weights Dry Weight: 262 kg (578 lbs) Wet Weight Estimated: 274 kg (604 lbs) (Approx. with full fluids) Cargo Front Rack Capacity: 20 kg (44 lbs) Rear Rack Capacity: 40 kg (88 lbs) Wheels Tires Front Tire Size: AT25x8-12 Rear Tire Size: AT25x10-12 Front Wheel Size: 12 x 7.0 AT Rear Wheel Size: 12 x 8.0 AT Bolt Pattern Wheels: 4/110mm 🛡️ Safety Features Ratings Safety Certification: Meets ANSI standards for recreational ATVs (American National Standards Institute). Active Features Braking System Type: Hydraulic disc brakes, front and rear. Parking Brake: Handlebar-mounted...