Basic Information Identification Make: Yamaha Model: Bruin 350 4WD / Hunter, Grizzly 350 4WD / Hunter Year: 2004 Type: ATV (All-Terrain Vehicle) Codes Engine Code: Not explicitly stated, but consistent with 348cc SOHC 4-stroke engine Chassis Code: Likely YFM350FW (Bruin 4WD) and YFM350FG (Grizzly 4WD) variants Introduction Market Position Market Position: The Yamaha Bruin and Grizzly 350 4WD models were positioned as reliable, versatile, and capable mid-size utility ATVs, appealing to hunters, recreational riders, and those needing a dependable workhorse. The 'Hunter' variants often included specific features tailored for hunting use, such as upgraded tires or camouflage paint schemes. Competitive Analysis Competitors: Competed directly with other major manufacturers' mid-size 4x4 utility ATVs, including models from Honda (e.g., FourTrax Foreman 4x4), Polaris (e.g., Sportsman 400/500), Suzuki (e.g., King Quad 300/345), and Kawasaki (e.g., Bayou 300/400). The Yamaha 350 series offered a balance of performance, durability, and value. Key Features Key Features: Selectable 4WD, automatic transmission (often Ultramatic CVT), independent front suspension (IFS) for improved ride comfort and handling, durable chassis, liquid-cooled engine, and robust braking systems. Manual Details Coverage Areas Coverage: Comprehensive service, repair, maintenance, and overhaul for 2004 Yamaha Bruin 350 4WD/Hunter and Grizzly 350 4WD/Hunter ATVs. Page Count Page Count: Not specified, but implies a complete dealership-level manual. Manual Type Manual Type: Service Repair Maintenance Overhaul Manual Language Language: English Format Format: PDF Download Manual Coverage Systems Covered Engine And Drivetrain: Complete disassembly, inspection, repair, and assembly of the 348cc engine, including top-end, bottom-end, cooling system, lubrication system, fuel system (carburetor), ignition system, and transmission/drivetrain components (including 4WD system, differential, driveshafts). Chassis And Suspension: Front and rear suspension systems, steering system, braking system (hydraulic disc brakes), wheels, tires, frame inspection and repair. Electrical System: Wiring diagrams, charging system (stator, regulator/rectifier, battery), starting system (starter motor, solenoid), lighting system, ignition system components, instrument panel. Bodywork And Plastics: Body panels, fenders, seat assembly, handlebars, controls, storage compartments. Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, spark plug service, chain adjustment (if applicable), brake fluid replacement, coolant checks, air filter cleaning/replacement. Troubleshooting: Diagnostic procedures for common performance issues, starting problems, electrical faults, braking issues, and drivetrain anomalies. Includes symptom-based troubleshooting guides. Repair And Overhaul: Detailed step-by-step instructions for complete engine rebuilds, transmission overhauls, suspension component replacement, brake caliper servicing, carburetor rebuilds, and electrical system repairs. Inspection: Visual inspections for wear and damage on all major components, torque specifications for critical fasteners, critical measurements for engine and drivetrain components. Technical Depth Depth: Comprehensive, dealership-level technical information suitable for both professional mechanics and experienced DIY enthusiasts. Covers all aspects from basic maintenance to complete engine and transmission rebuilds. Manual Specifications File Format File Format: Digital PDF Print Quality Print Quality: High quality, computer-generated, not scanned. Allows for unlimited zooming without loss of clarity for text and images. Binding Type Binding Type: N/A (Digital PDF download) Paper Type Paper Type: N/A (Digital PDF download) Engine Specifications Primary Engine Engine Type: 348cc, Air-Cooled, SOHC, 4-stroke, 2-valve, Single Cylinder Bore X Stroke: 83mm x 64.5mm (Approximate for this engine family) Compression Ratio: 9.2:1 (Typical for this engine family) Cooling System: Liquid-Cooled Performance Horsepower: Approximately 21-23 HP (Estimate based on similar models) Torque: Not officially published, but adequate for utility tasks. Fuel System Fuel Delivery: Mikuni BSR33 carburetor Fuel Type: Unleaded gasoline, minimum 87 octane Fuel Tank Capacity: 3.2 US gal (12 L) Lubrication Oil Type: Yamalube 4 (or equivalent API SG, SAE 10W-40 or 20W-40) Oil Capacity: Approximately 1.77 US qt (1.68 L) with filter change Transmission Standard Transmission Type: Automatic (Yamaha Ultramatic® CVT with engine braking) Gear Selection: H (High), L (Low), N (Neutral), R (Reverse), P (Park) Drive System: Shaft Drive; On-Demand 4WD with locking front differential (selectable) Features Engine Braking: Integral to the Ultramatic CVT, providing significant engine braking on descents. Transmission Fluid Type: Yamalube Hi-Performance Gear Oil (or equivalent SAE 80 GL-3) Transmission Fluid Capacity: Approximately 0.17 US qt (0.16 L) Dimensions Exterior Length: Approximately 76.8 in (1950 mm) Width: Approximately 42.1 in (1070 mm) Height: Approximately 45.3 in (1150 mm) Wheelbase: Approximately 48.4 in (1230 mm) Ground Clearance: Approximately 10.8 in (275 mm) Weights Dry Weight: Approximately 538 lbs (244 kg) Towing Capacity: 1,102 lbs (500 kg) Rack Capacity Front: 99 lbs (45 kg) Rack Capacity Rear: 176 lbs (80 kg) Safety Features Ratings Safety Certifications: Meets ANSI standards for Class II ATVs. Active Features Braking System: Hydraulic disc brakes front and rear. Parking brake mechanism integrated into the transmission or rear brake caliper. Lighting: Dual 30W halogen headlights, 8W taillight/stoplight. Passive Features Handlebar Design: Wide handlebars with foam pad and ergonomic grips for control and comfort. Footwells: Wide, rugged footwells with heel guards to protect rider's feet. Seat: Comfortable, textured seat for rider stability. Technology Features Infotainment Infotainment System: N/A (ATV technology focuses on mechanical and functional aspects, not typical...