🏷️ Basic Information

Make:

Yamaha

Model:

YFM350 Bruin

Model Variant:

YFM350AS

Model Variant Two:

YFM400

Model Lineup:

Yamaha Bruin ATV series.

Generation Code:

First Generation

Production Years Covered:

2003, 2004, 2005, 2006, 2007, 2008

👋 Introduction

Target Audience:

Owners and technicians seeking detailed repair information for Yamaha YFM350 Bruin series ATVs.

Unique Selling Proposition:

Improved PDF quality with advanced navigation features (bookmarks, search) and compatibility across all major operating systems, unlike standard scanned manuals.

Value Proposition:

Provides factory-level repair data, enabling efficient and accurate servicing of the specified Yamaha ATV models.

Customer Satisfaction:

Satisfaction Guaranteed or Money Back.

📋 Manual Details

Primary Coverage:

Comprehensive repair and service for Yamaha YFM350 Bruin and related models.

Secondary Coverage:

Includes YFM350AS and YFM400 variants.

Page Count Estimate:

Hundreds of pages (exact number not specified, but indicates a comprehensive manual).

Manual Type:

Factory Repair Manual

Language:

English

File Format:

PDF Download

Delivery Method:

Instant Download.

📖 Manual Coverage

Engine Systems:

General Information, Specifications, Periodic Checks & Adjustments, Engine, Cooling System, Fuel Injection System.

Chassis Systems:

Chassis.

Electrical Systems:

Electrical System, Wiring Diagrams.

Troubleshooting:

Troubleshooting section included.

Maintenance Procedures:

Periodic Checks & Adjustments, routine maintenance tasks.

Diagnostic Procedures:

Troubleshooting guidance for common issues.

Repair Procedures:

Detailed instructions for component repair and replacement.

Depth Of Coverage:

Complete Factory Repair Manual, suitable for professional mechanics and advanced DIY enthusiasts.

Diagrams Included:

Hundreds of diagrams and illustrations to support repair and maintenance procedures.

📊 Manual Specifications

Digital Enhancements:

Improved PDF with Bookmarks, Sub bookmarks, Searchable Text, Index.

Original Format:

Not a scan, improved quality.

Printable Pages:

Print pages as needed.

Backup Media:

Can burn backup CD.

Operating Systems:

Compatible with ALL Windows, ALL Mac, ALL Linux.

Ease Of Use:

Easy to use, avoids digging through hundreds of pages.

⚙️ Engine Specifications

Engine Type:

Likely a 4-stroke, SOHC (Single Overhead Camshaft) engine based on common Yamaha Bruin configurations.

Engine Displacement:

Yamaha YFM350 typically features a 348cc engine. YFM400 variant would have a 400cc class engine.

Bore X Stroke:

Specific bore and stroke dimensions for the 350cc and 400cc engines will be found within the manual's specifications.

Power Delivery:

The manual will detail power output, torque curves, and optimal performance settings.

Compression Ratio:

The manual will list the correct compression ratio for engine diagnosis and performance checks.

Fuel Delivery:

Covers the Fuel Injection System, detailing components like injectors, fuel pump, sensors, and ECU (Engine Control Unit) operation.

Fuel Type:

Unleaded gasoline. Manual will specify octane rating requirements.

Cooling Method:

Liquid-cooled system, detailing radiator, fan, water pump, and thermostat service.

🔧 Transmission

Transmission Type:

Likely features a Constant Velocity Transmission (CVT) with automatic shifting and a High/Low range, common for this class of ATV. Manual will detail CVT operation, belt inspection/replacement, and clutch assembly.

Drive System:

The manual will cover the drive system, likely including shaft drive and potentially selectable 4WD or full-time 4WD depending on specific YFM350AS/YFM400 sub-models.

📐 Dimensions

Vehicle Type:

All-Terrain Vehicle (ATV) / Quad Bike.

Dry Weight Estimate:

Approximately 250-270 kg (550-600 lbs) depending on configuration. Specific weights for YFM350, YFM350AS, and YFM400 will be in the manual.

🛡️ Safety Features

Atv Safety Standards:

The manual implicitly supports adherence to ATV safety standards through proper maintenance and repair procedures.

Braking System:

Details on hydraulic disc brakes (front and rear), including caliper service, pad replacement, and fluid specifications.

Chassis Stability:

Information on suspension components (e.g., independent front suspension, swingarm rear suspension), steering geometry, and wheel alignment for safe handling.

💡 Technology Features

Infotainment Systems:

Basic instrumentation (speedometer, odometer, warning lights) relevant to an ATV of this era. No advanced infotainment systems expected.

Atv Assistance Features:

Features like automatic transmission, selectable 4WD (on some models), and engine braking are covered by the manual's system descriptions.

Diagnostic Ports:

The manual will detail any diagnostic ports or procedures for engine control unit (ECU) diagnostics, particularly for the fuel-injected models.

🔧 Maintenance

Oil Change Interval:

Typically every 1000 km or 6 months, or as per hours of operation, for engine oil and filter. Specific intervals detailed in the manual.

Spark Plug Service:

Scheduled inspection and potential replacement at regular intervals. Manual will specify type and gap.

Air Filter Maintenance:

Regular cleaning or replacement based on operating conditions. Manual will provide procedures and filter part numbers.

Engine Oil Type:

Likely Yamalube 4 (or equivalent) SAE 10W-30 or 10W-40 API SG or higher. Manual will provide precise specification and capacity.

Coolant Type:

A permanent type antifreeze (ethylene glycol based) mixed with distilled water. Manual will specify ratio and type.

Brake Fluid Type:

DOT 3 or DOT 4 hydraulic brake fluid. Manual will specify and advise on bleeding procedures.

Gear Oil Type:

Manual will specify appropriate gear oil for the final drive and transmission (if separate). Likely SAE 80W-90 GL-4 or GL-5.

Common Wear Items:

Brake pads, tire wear, drive belts (CVT), wheel bearings, and potential carburetor (if applicable on some models/years) or fuel injection system cleaning.

Troubleshooting Focus:

The manual's troubleshooting section is key for diagnosing electrical faults, engine performance issues, and driveline problems.

📚 Vehicle History

Yamaha Atv Legacy:

Yamaha has a long-standing reputation for producing reliable and capable ATVs, often pioneering new technologies and designs in the segment.

Bruin Series Introduction:

The Bruin series, introduced around 2004, represented Yamaha's offering in the mid-size utility ATV market, known for its comfort and ease of use. The manual covers a key development period for this model.

Manufacturing Origin:

Yamaha ATVs are typically manufactured in Japan or through Yamaha Motor Manufacturing Corporation of America (YMMC) in Georgia, USA. Manual will reflect specifications for models produced during the 2003-2008 timeframe.

📄 Chassis

Front Suspension Type:

Independent Double Wishbone with spring pre-load adjustment. Manual details travel and alignment specs.

Rear Suspension Type:

Swingarm with monoshock, featuring adjustable pre-load. Manual details travel and adjustments.

Front Tire Size:

Commonly 25x8-12. Manual will provide exact sizes and pressure recommendations.

Rear Tire Size:

Commonly 25x10-12. Manual will provide exact sizes and pressure recommendations.

Wheel Bolt Pattern:

Typically 4-bolt pattern, specific bolt circle diameter (BCD) will be in manual.