Positioning:
Designed for recreational trail riding and utility tasks, offering a balance of performance and ease of use.
Competitors:
Polaris Sportsman 300/330, Honda Rancher 350/400, Kawasaki Prairie 300/360, Suzuki KingQuad 300/345.
Engine Type:
Reliable air-cooled, SOHC, single-cylinder engine.
Transmission Type:
Automatic transmission with high/low range and reverse (CVT).
Drive System:
Selectable 2WD (4x2) with shaft drive.
Suspension:
Independent front suspension and swingarm rear suspension for comfortable ride.
Manual Value Proposition:
Provides comprehensive coverage, detailed visuals, and searchable functionality, essential for DIY maintenance and repair.
Primary Coverage:
Complete Workshop Repair and Owner's Maintenance for 2005-2009 Yamaha Bruin 250 4x2
Additional Coverage:
Includes all necessary supplementary manuals for the specified model years.
Service Manual Pages:
Estimated 500+ pages (typical for this class of service manual)
Owner Manual Pages:
Estimated 100+ pages (typical for this class of owner's manual)
Service Manual:
Workshop Repair Manual
Owner Manual:
Owner's Maintenance Manual
Parts Catalog:
Likely includes exploded parts diagrams within the service manual.
Engine:
Complete engine overhaul, valve adjustment, carburetor tuning, cooling system, lubrication.
Transmission:
Gearbox inspection, repair, fluid changes, clutch operation.
Drivetrain:
Shaft drive, differential (if applicable), wheel hubs, axle maintenance.
Suspension:
Front and rear suspension component inspection, adjustment, and replacement (shocks, springs, control arms).
Brakes:
Hydraulic brake system (front and rear), caliper service, master cylinder, brake fluid replacement, bleeding procedures.
Steering:
Handlebar assembly, steering stem, tie rods, linkage inspection and adjustment.
Electrical:
Ignition system, charging system (stator, regulator/rectifier), battery, starter motor, lighting, wiring diagrams, troubleshooting.
Fuel System:
Fuel tank, fuel pump, fuel lines, carburetor cleaning and adjustment, fuel filter replacement.
Frame And Body:
Frame inspection, plastic panel removal and installation, seat, racks.
Maintenance:
Scheduled maintenance, oil changes, filter replacements, chain adjustment (if applicable), spark plug service, air filter cleaning/replacement.
Troubleshooting:
Diagnostic procedures for common and uncommon issues, symptom-based troubleshooting guides.
Repair:
Detailed step-by-step instructions for component disassembly, repair, reassembly, and adjustment.
Engine Rebuild:
Complete engine teardown, piston replacement, cylinder honing, crankshaft inspection, seal replacement.
Valve Jobs:
Valve clearance adjustment, valve seat inspection, valve guide replacement.
Electrical Diagnostics:
Wiring diagram interpretation, component testing using multimeters, fault finding.
Carburetor Tuning:
Idle speed adjustment, mixture screw settings, jetting recommendations.
Depth:
Comprehensive from basic owner maintenance to full workshop overhaul and advanced electrical diagnostics.
Detail Level:
Detailed procedures with accompanying pictures and exploded parts diagrams.
Engine Type:
4-stroke, SOHC, air-cooled, single-cylinder
Bore X Stroke:
74.0 mm x 58.0 mm
Compression Ratio:
9.2:1 (typical)
Valve Arrangement:
SOHC (Single Overhead Camshaft), 2 valves per cylinder
Horsepower:
Approx. 16-18 HP (estimated, actual figures vary)
Torque:
Approx. 14-16 lb-ft (estimated, actual figures vary)
Carburetor Model:
Mikuni VM32SS (typical)
Fuel Type:
Unleaded gasoline, minimum 87 octane
Oil Type:
Yamalube 4-stroke motorcycle oil, SAE 10W-30 or 20W-40 (refer to manual for specific recommendations based on temperature).
Oil Capacity:
Approx. 1.75 L (1.85 US qt) with filter change (verify in manual).
Ignition System:
CDI (Capacitor Discharge Ignition)
Cooling Method:
Forced air cooling
Transmission Type:
Automatic transmission (CVT - Continuously Variable Transmission)
Gear Selection:
High (H), Low (L), Neutral (N), Reverse (R)
Drive Type:
Shaft drive to rear wheel.
Clutch Type:
Automatic centrifugal clutch
Transmission Fluid:
Yamaha specific CVT fluid or equivalent as per manual. (DO NOT use regular gear oil or engine oil).
Transmission Fluid Capacity:
Approx. 0.5 L (verify in manual).
Length:
Approx. 1,995 mm (78.5 in)
Width:
Approx. 1,120 mm (44.1 in)
Height:
Approx. 1,140 mm (44.9 in)
Wheelbase:
Approx. 1,225 mm (48.2 in)
Ground Clearance:
Approx. 255 mm (10.0 in)
Dry Weight:
Approx. 241 kg (531 lbs)
Wet Weight:
Approx. 257 kg (567 lbs) (estimated with fluids)
Front Rack Capacity:
Approx. 40 kg (88 lbs)
Rear Rack Capacity:
Approx. 80 kg (176 lbs)
Crash Test Ratings:
Not applicable for ATVs in the same way as passenger vehicles.
Brakes:
Hydraulic disc brakes front and rear.
Parking Brake:
Thumb-activated mechanical parking brake.
Lighting:
Halogen headlights, taillight, brake light.
Engine Braking:
Provided by the CVT system.
Display:
Digital instrument cluster displaying speed, odometer, trip meter, neutral indicator, gear selection (H/L/R), and potentially fuel level.
Selectable Drive:
2WD system allows for engaging rear-wheel drive for better maneuverability and fuel economy in lighter conditions.
Charging Port:
May have a 12V accessory outlet for charging devices (verify in manual).
Engine Oil Change:
Every 3,000 km (1,800 miles) or 6 months, whichever comes first. (Verify in Owner's Manual).
Air Filter Cleaning:
Every 1,000 km (600 miles) or 3 months. Replace if damaged. (Verify in Owner's Manual).
Spark Plug Check:
Every 3,000 km (1,800 miles) or 6 months. Replace as needed. (Verify in Owner's Manual).
Transmission Fluid Change:
Every 6,000 km (3,600 miles) or 12 months. (Verify in Owner's Manual).
Valve Clearance Check:
Every 6,000 km (3,600 miles) or 12 months. (Verify in Owner's Manual).
Engine Oil Specification:
Yamalube 4-stroke motorcycle oil, SAE 10W-30 or 20W-40 (depending on ambient temperature, check manual).
Brake Fluid Specification:
DOT 3 or DOT 4 hydraulic brake fluid (verify in manual).
Carburetor Clogging:
Common with any carbureted engine that sits for extended periods; requires cleaning and potential jet replacement.
Cvt Belt Wear:
Regular inspection and replacement of the CVT belt are necessary to prevent loss of power or belt failure.
Carburetor Jetting:
May require adjustments if operating at significantly different altitudes or after modifications.
Suspension Bushings:
Over time, bushings can wear, leading to play and a less responsive ride; replacement is standard maintenance.
Yamaha Atv History:
Yamaha has a long-standing history in the ATV market, known for robust engineering and reliable performance, with models like the Big Bear, Warrior, and Raptor.
Bruin Lineage:
The Bruin 250 was positioned as an entry-level to mid-range utility ATV, offering a user-friendly experience and versatile capabilities for various tasks.
Manufacturing Location:
Primarily manufactured in Japan and/or USA by Yamaha Motor Corporation.
