🏷️ Basic Information

Make:

Yamaha

Model:

YFM250 Bruin / Big Bear

Model Variant Bruin:

YFM250 Bruin

Model Variant Bigbear:

YFM250 Big Bear 2WD

Applicable Years:

2005, 2006, 2007, 2008, 2009

Engine Code Prefix:

YFM250

👋 Introduction

Segment:

Entry-level to mid-range utility ATVs (All-Terrain Vehicles)

Competitors:

Honda TRX250EX/Recon, Suzuki LT-F250F QuadRunner, Kawasaki KLF250 Bayou

Vehicle Strengths:

Reliability, ease of use, user-friendly power delivery, suitable for recreational riding and light utility tasks

Value For Owner:

Empowers owners to perform their own maintenance and repairs, saving significant costs on dealership labor

Scope:

Considered the most complete service repair manual compiled for these specific models

📋 Manual Details

Primary Coverage:

Service and Repair

Secondary Coverage:

Maintenance, Troubleshooting, Specifications, Periodic Inspections, Adjustments

Total Pages:

444

Type:

Service Repair Manual

Language:

English

File Format:

PDF

📖 Manual Coverage

Engine:

Complete overhaul, engine disassembly and reassembly, internal component inspection and replacement

Carburetion:

Carburetor cleaning, adjustment, synchronization, jetting, troubleshooting

Drivetrain:

Clutch operation, gearbox, drive shaft, differential, final drive maintenance and repair

Chassis:

Suspension (front and rear), steering system, braking system, wheel hub assembly, frame components

Electrical:

Ignition system, lighting, battery, starter motor, charging system, wiring diagrams, electrical component testing

Bodywork:

Body panel removal and installation, plastics, decals, overall general assembly

Maintenance:

Scheduled maintenance, oil changes, filter replacements, spark plug service, chain adjustment (if applicable)

Troubleshooting:

Diagnostic procedures for common and uncommon issues, fault finding guides

Repair:

Detailed step-by-step instructions for component repair and replacement

Adjustment:

Carburetor idle speed, clutch engagement, brake lever play, suspension settings

Depth:

Comprehensive, from basic maintenance to advanced engine and drivetrain overhaul

📊 Manual Specifications

Compatibility:

All Versions of Windows & Mac

Print Restriction:

Printable without any restriction

Binding:

Digital Download (PDF)

Media:

Digital PDF Document

⚙️ Engine Specifications

Engine Type:

Air-cooled, 4-stroke, SOHC

Displacement:

249cc

Bore X Stroke:

74.0 mm x 58.0 mm

Compression Ratio:

9.6:1

Horsepower Estimate:

Approx. 17-19 HP (varies by source and condition)

Torque Estimate:

Approx. 13-15 lb-ft (varies by source and condition)

Fuel Delivery:

Carburetor

Carburetor Model:

Mikuni BSR26 (typical)

Ignition System:

CDI (Capacitor Discharge Ignition)

🔧 Transmission

Transmission Type:

Automatic (V-belt type / CVT)

Drive System:

2WD (Shaft Drive)

Gear Selection:

Forward, Neutral, Reverse

📐 Dimensions

Overall Length:

Approx. 72.2 inches (1835 mm)

Overall Width:

Approx. 41.9 inches (1065 mm)

Overall Height:

Approx. 41.1 inches (1045 mm)

Dry Weight:

Approx. 467 lbs (212 kg) for Bruin, slightly more for Big Bear

Fuel Capacity:

Approx. 3.2 gallons (12 liters)

🛡️ Safety Features

Safety Classification:

ATV (Classified as Recreational Off-Highway Vehicle)

Brakes Front:

Dual hydraulic disc

Brakes Rear:

Hydraulic disc

Handlebars:

Standard ATV handlebars for control

Throttle:

Thumb-operated throttle for controlled acceleration

💡 Technology Features

Infotainment System:

Not applicable (basic utility ATV design)

Driver Assistance Features:

None (basic utility ATV design)

Connectivity Features:

None (basic utility ATV design)

Dashboard Display:

Basic analog speedometer, odometer, neutral indicator, reverse indicator, oil warning light

🔧 Maintenance

Engine Oil Change:

Every 100 hours or annually, whichever comes first (refer to manual for specific interval details)

Air Filter Cleaning:

Inspect and clean every 100 hours or more frequently in dusty conditions

Spark Plug Replacement:

Refer to manual for recommended mileage/time interval, often around 2,000-3,000 miles or 1-2 years

Engine Oil Type:

Yamalube 4 (or equivalent SAE 10W-30 API SG or higher)

Engine Oil Capacity:

Refer to manual, typically around 1.8-2.0 Liters with filter change

Brake Fluid Type:

DOT 3 or DOT 4 (refer to manual for specific recommendation)

Common Wear Items:

Brake pads, wheel bearings, drive belt (CVT), carburetor diaphragm, starter motor brushes

Potential Problems:

Carburetor jetting can be sensitive to altitude and temperature changes; some early models may experience minor electrical connector issues if exposed to excessive moisture.

Carb Cleaning Importance:

Regular carburetor cleaning is vital for maintaining optimal engine performance, especially if the ATV sits for extended periods.

📚 Vehicle History

Manufacturer Specialty:

Yamaha Corporation is a Japanese multinational corporation renowned for its motorcycles, marine products, musical instruments, and electronics.

Bruin Lineage:

The Bruin series was introduced as Yamaha's reliable and accessible entry-level utility ATV, known for its comfortable ride and ease of operation.

Bigbear Lineage:

The Big Bear line has a longer history within Yamaha's ATV lineup, generally representing a more rugged and work-oriented platform, though the 2WD 250cc model bridges utility and recreational use.

Manufacturing Location:

Primarily manufactured in Japan, with potential assembly in other global locations.

🏆 Awards & Recognition

Award History:

While specific awards for these individual model years are not widely publicized, Yamaha ATVs have consistently received positive reviews for reliability and performance within the utility ATV segment.

Owner Satisfaction:

Generally high owner satisfaction due to the vehicles' durability and ease of maintenance.