Model Variants Covered:
2WD and 4WD (non-IRS models)
Model Years Covered:
2004, 2005, 2006, 2007, 2008, 2009
Chassis Codes:
YFM350FG (4WD), YFM350 (2WD)
Category:
All-Terrain Vehicle (ATV)
Target User:
ATV enthusiasts, recreational riders, hunters, farmers, and professional mechanics.
Competitors:
Honda TRX series, Polaris Sportsman series, Suzuki KingQuad series, Arctic Cat models.
Vehicle Strengths:
Reliability, ease of use, versatility for various terrains, strong 2WD/4WD capabilities.
Manual Value Proposition:
Provides professional-grade repair and maintenance information, enabling owners to perform complex tasks and save on shop costs.
Engine:
Complete engine disassembly, assembly, tuning, troubleshooting, and component specifications.
Fuel System:
Carburetor servicing, fuel pump, fuel lines, fuel tank maintenance, and specifications.
Drivetrain:
2WD/4WD engagement system, driveshafts, differential (front and rear), bevel gear, final drive.
Transmission:
Automatic transmission (Ultramatic), clutch, gear shifting mechanisms, maintenance, and repair.
Suspension:
Front independent suspension (double A-arm), rear swingarm, shock absorbers, bushings, and alignment.
Brakes:
Hydraulic disc brakes (front and rear), brake fluid specifications, bleeding procedures, caliper maintenance.
Electrical System:
Ignition system, charging system (stator, regulator/rectifier), starter motor, battery, lighting, wiring diagrams.
Cooling System:
Air-cooled engine, cooling fins, fan operation (if applicable).
Frame And Bodywork:
Frame inspection, body panel removal/installation, seating, fenders, handlebars.
Maintenance:
Oil changes, filter replacements, spark plug service, air filter cleaning/replacement, lubrication points.
Troubleshooting:
Diagnostic charts for common issues, symptom-based troubleshooting guides, electrical system diagnostics.
Repair:
Component replacement, engine rebuild procedures, transmission overhaul, brake system repairs.
Overhaul:
Complete disassembly and reassembly instructions for major components like the engine and transmission.
Adjustments:
Carburetor adjustments, valve clearance checks and adjustments, brake lever adjustment.
Depth:
Professional level, mirroring dealership workshop manuals. Covers general maintenance to complete engine and transmission overhauls.
Engine Type:
4-stroke, SOHC, air-cooled, single-cylinder
Bore X Stroke:
83.0 mm x 64.5 mm
Horsepower:
Approximately 20-22 hp (estimated, varies by region/tuning).
Torque:
Approximately 20-22 lb-ft (estimated).
Carburetor:
Mikuni BSR33, single, downdraft type
Fuel Type:
Unleaded gasoline (87 octane or higher recommended)
Oil Type:
Yamalube 4 (or equivalent API SG, JASO MA certified 10W-40)
Ignition System:
CDI (Capacitor Discharge Ignition)
Cooling Method:
Air-cooled
Type:
Automatic (Yamaha Ultramatic CVT - Continuously Variable Transmission)
Drive System:
Shaft drive
Gear Reduction:
High and Low range, Neutral, Reverse
Belt Tension:
Automatic belt tension adjustment system within the CVT.
Fluid Type:
Yamaha Gear Oil (or equivalent API GL-4, SAE 80W-90)
Fluid Capacity:
Approximately 0.16 L (160 ml) for the final drive.
Length:
Approx. 76.8 in (1950 mm)
Width:
Approx. 42.1 in (1070 mm)
Height:
Approx. 45.7 in (1160 mm)
Wheelbase:
Approx. 50.0 in (1270 mm)
Dry Weight:
Approx. 560 lbs (254 kg) for 4WD model.
Ground Clearance:
Approx. 7.1 in (181 mm)
Front Rack Capacity:
Approx. 88 lbs (40 kg)
Rear Rack Capacity:
Approx. 176 lbs (80 kg)
Atv Safety Standards:
Designed to meet ANSI/SVIA 1-2001 and 2010 safety standards for ATVs.
Braking System:
Hydraulic disc brakes front and rear, parking brake.
Drive Control:
Selectable 2WD/4WD, sealed drum brake for parking.
Handlebars:
Tapered handlebars with thumb throttle for precise control.
Lighting:
Dual halogen headlights, taillight/stoplight.
Features:
Basic instrumentation panel including speedometer, odometer, trip meter, neutral indicator, and reverse indicator.
Features:
Selectable 2WD/4WD system for adapting to various terrain conditions.
Features:
N/A (No modern connectivity features like Bluetooth or GPS)
Engine Oil Change:
Every 1,000 km (600 miles) or 6 months.
Air Filter Cleaning:
Every 500 km (300 miles) or 3 months, more often in dusty conditions.
Spark Plug Check:
Every 1,000 km (600 miles) or 6 months.
Valve Clearance Check:
Every 2,000 km (1,200 miles) or 12 months.
Brake Fluid Check:
Inspect every 500 km (300 miles) or 3 months, replace every 2 years.
Engine Oil Viscosity:
SAE 10W-40
Engine Oil Capacity:
1.8 L (1.9 US qt) with filter change.
Brake Fluid Type:
DOT 3 or DOT 4
Cvt Belt Wear:
CVT belt can wear over time, especially with aggressive riding; manual provides replacement procedures.
Carburetor Tuning:
Carburetor may require periodic adjustments for optimal performance due to environmental factors or wear.
Electrical Connections:
Corrosion on electrical connectors, especially in wet environments, can cause starting or running issues.
Suspension Bushings:
Wear in suspension bushings can lead to loose handling and premature tire wear.
Heritage:
Yamaha has a long-standing reputation for building reliable and durable off-road vehicles since the mid-20th century.
Lineage:
The Bruin 350 served as a capable mid-size utility ATV, bridging the gap between smaller recreational models and larger, more powerful utility ATVs. It evolved from earlier Yamaha models and shares mechanical components with other Yamaha ATVs of the era.
Manufacturing Location:
Primarily manufactured in Japan, with some components sourced globally.
Production Period:
The Bruin 350 was produced from approximately 2004 to 2006, after which Yamaha integrated its features and technology into the Grizzly line more prominently, with the Grizzly 350 inheriting much of the Bruin's platform.
