🏷️ Basic Information

Make:

Yamaha

Model:

Bruin 350

Model Variant:

400

Body Style:

ATV (All-Terrain Vehicle)

Powertrain Layout:

4x4 (Four-Wheel Drive)

Engine Code:

350cc class, likely single-cylinder, SOHC, 4-stroke

Chassis Code:

Refer to VIN and specific model identification for detailed chassis codes

👋 Introduction

Market Position:

The Yamaha Bruin 350 400 (likely referring to the 350cc model with 4WD capabilities, often colloquially grouped with similar displacements) was positioned as a capable and reliable utility ATV, designed for recreational riding, light farm work, and trail exploration. It competed in a segment that prioritized durability and ease of use.

Competitive Analysis:

Competed against models from Honda (e.g., FourTrax), Suzuki (e.g., KingQuad), and Arctic Cat, offering a blend of power, comfort, and 4WD functionality. Its focus was on delivering value for riders needing a versatile off-road machine.

Key Features:

Automatic transmission, selectable 4WD, independent front suspension, robust engine, comfortable seating, and Yamaha's reputation for build quality.

Manual Value Proposition:

This manual provides comprehensive, model-specific repair and maintenance information, empowering owners and technicians to perform a wide range of services accurately and efficiently, saving time and money compared to relying solely on professional service centers.

📋 Manual Details

Covered Model Years:

2004, 2005, 2006

Coverage Scope:

All workshop repair procedures, electrical diagrams, service procedures, fluid capacities

Estimated Page Count:

Comprehensive (Specific count not provided, but content indicates full workshop coverage)

Manual Type:

Workshop Service Repair Manual

Language:

English

Format:

PDF (Digital Download)

📖 Manual Coverage

Engine Systems:

Engine removal/installation, cylinder head, valve, cylinder, piston, crankcase, crankshaft, primary shaft, clutch, lubrication

Drivetrain Systems:

Transmission, sub-transmission, gearshift linkage

Suspension And Steering:

Front wheel/suspension, rear wheel/suspension

Braking Systems:

Hydraulic brake system

Electrical Systems:

Battery/charging system, ignition system, electric starter, switches, electrical diagrams

Fuel And Ignition:

Fuel system, ignition system

Maintenance Procedures:

Routine maintenance, lubrication, inspection, adjustment

Repair Procedures:

Engine rebuilding, component overhaul, suspension repair, brake system repair, electrical system repair

Diagnostic Procedures:

Troubleshooting guides, electrical diagnostics

Technical Depth:

Comprehensive: from basic maintenance and adjustments to complete engine and component rebuilds, including detailed electrical schematics.

📊 Manual Specifications

File Format:

PDF

File Compatibility:

PC and MAC compatible

File Features:

Searchable text, zoom in/out functionality for clarity

Print Quality:

High-resolution for clear diagrams and text. Printable pages.

Binding Type:

N/A (Digital Download)

Paper Type:

N/A (Digital Download)

⚙️ Engine Specifications

Engine Type:

Single-cylinder, 4-stroke, SOHC (Single Overhead Camshaft)

Displacement:

Approximately 348cc (for the 350 designation)

Cooling System:

Likely liquid-cooled, with radiator and fan

Bore X Stroke:

Specific figures would be detailed in the manual, typical for this class of engine.

Compression Ratio:

Specific figures would be detailed in the manual.

Fuel Delivery:

Likely Carbureted, possibly Mikuni

Oil Capacity:

Specific capacity detailed in the manual, typically around 1.5-2.0 liters

Oil Type Recommendation:

Yamalube or equivalent API SG or higher, SAE 10W-40 or 20W-50 depending on temperature (specifics in manual)

Ignition Type:

CDI (Capacitor Discharge Ignition)

🔧 Transmission

Transmission Type:

Automatic Transmission (AT) with Ultramatic® system

Drive System:

Shaft drive, 4WD with On-Command® (selectable 2WD/4WD)

Gear Ratios:

Detailed low and high range ratios provided in the manual.

Clutch Type:

Automatic centrifugal clutch

Final Drive Type:

Bevel gear and drive shaft

📐 Dimensions

Length:

Approx. 76.8 inches (1950 mm)

Width:

Approx. 42.7 inches (1085 mm)

Height:

Approx. 45.7 inches (1160 mm)

Dry Weight:

Approx. 591 lbs (268 kg)

Towing Capacity:

Likely 1,100 lbs (500 kg) or more, detailed in manual.

Payload Capacity:

Front Rack: 88 lbs (40 kg), Rear Rack: 176 lbs (80 kg)

Wheelbase:

Approx. 49.2 inches (1250 mm)

Ground Clearance:

Approx. 10.5 inches (267 mm)

🛡️ Safety Features

Safety Ratings:

ATVs are not typically subject to the same crash safety ratings as passenger vehicles. Safety is inherent in design and rider operation.

Active Features:

Powerful hydraulic disc brakes (front and rear), aggressive tire tread for traction, selectable 4WD for enhanced grip.

Passive Features:

Ergonomic seating, robust chassis, durable bodywork.

💡 Technology Features

Infotainment System:

N/A (Utility ATV, focus is on mechanical function and performance).

Driver Assistance:

N/A (No electronic driver aids in the modern sense. 4WD system and braking are the primary performance-enhancing technologies).

Connectivity:

N/A

🔧 Maintenance

Initial Service:

Typically at 10-20 hours or 100 miles (break-in service: oil change, filter check, chain adjustment if applicable).

Engine Oil Change:

Every 100 hours or 6 months (whichever comes first).

Air Filter Cleaning:

Every 20 hours or 2 months (more frequently in dusty conditions).

Spark Plug Replacement:

Inspect every 100 hours, replace as needed.

Valve Clearance Check:

Every 100 hours or 12 months.

Engine Oil Grade:

SAE 10W-30 or 20W-40 recommended, conforming to API classification SG or higher (verify with manual for specific ambient temperature range recommendations).

Coolant Type:

Permanent type antifreeze coolant (ethylene glycol base) with corrosion inhibitor, typically a 50/50 mix with distilled water.

Brake Fluid Type:

DOT 3 or DOT 4 hydraulic brake fluid (verify with manual for exact specification).

Known Issues:

Some owners report occasional issues with carburetor performance if not properly maintained, drive shaft spline wear on early models under heavy use, and potential for plastic body panels to become brittle over time. The manual will provide guidance on addressing these and other potential wear-related items.

📚 Vehicle History

Brand Heritage:

Yamaha has a long and respected history in powersports, known for innovation, performance, and reliability in motorcycles, ATVs, and watercraft. The Bruin line benefits from this extensive engineering experience.

Model Evolution:

The Bruin 350 was part of Yamaha's evolution of utility ATVs, building upon earlier models and paving the way for future designs like the Grizzly. It represented a balance of affordability and capability in the utility ATV market.

Production Period:

The Bruin 350 was produced roughly from the early to mid-2000s, with the 2004-2006 models being covered by this manual.

🏆 Awards & Recognition

Recognitions:

Specific awards for the Bruin 350 model may not be widely documented, but Yamaha's ATV lines generally receive recognition for durability and innovation within the powersports industry.