Segment:
Entry-level to mid-range utility ATV, popular for trail riding, light farm work, and recreational use.
Competitors:
Honda Rancher, Kawasaki Prairie 300/360, Suzuki Vinson 500 (though often priced below the Vinson), Polaris Trail Boss.
Features:
Reliable air-cooled engine, comfortable riding position, selectable 2WD/4WD (though this specific manual is for 4x2), independent front suspension, shaft drive.
Value:
Offers a robust and relatively simple platform for riders seeking dependable performance without the complexity or cost of more advanced models. The 4x2 configuration is ideal for drier terrain and less demanding applications.
Engine Mechanical:
Full disassembly, inspection, assembly, valve adjustment, timing, piston, cylinder, crankshaft, lubrication system.
Engine Fuel System:
Carburetor specifications, cleaning, adjustment, fuel pump, fuel lines.
Engine Electrical:
Ignition system, CDI unit, spark plug specifications, starting system, charging system (stator, regulator/rectifier), lighting system.
Transmission:
Automatic transmission (Ultramatic), clutch operation, gear shifting mechanism, lubrication.
Drivetrain:
Front and rear driveshafts, differentials (if applicable to 4x2), U-joints, wheel hubs.
Chassis And Suspension:
Frame inspection, front and rear suspension components (shocks, A-arms, bushings), steering system, wheel alignment.
Brakes:
Hydraulic brake system, front and rear brake calipers, master cylinders, brake fluid specifications, bleeding procedures, pad replacement.
Electrical System:
Wiring diagrams, battery maintenance, fuse locations, switches, relays, lighting, instrument cluster.
Bodywork And Trim:
Body panel removal and installation, seat, fenders, handlebars, rack components.
Routine Maintenance:
Oil changes, filter replacements, air filter cleaning/replacement, spark plug checks, lubrication points, valve clearance checks.
Troubleshooting:
Diagnostic charts for common problems (e.g., starting issues, engine performance, braking problems), fault finding.
Repair And Overhaul:
Detailed step-by-step instructions for component disassembly, repair, and reassembly, including engine rebuild and transmission service.
Adjustments:
Carburetor adjustment, throttle cable adjustment, brake lever free play, idle speed settings.
Wiring Diagrams:
Comprehensive electrical schematics for all systems, aiding in diagnosis and repair of electrical faults.
Depth:
Comprehensive Workshop Manual - Covers all aspects from basic owner maintenance to complete engine and transmission overhauls, including detailed diagnostics and specifications.
Engine Type:
Air-cooled, 4-stroke, SOHC, 2-valve
Bore X Stroke:
83 mm x 64.5 mm
Horsepower Estimate:
Approximately 20-22 HP (Actual figures may vary)
Torque Estimate:
Approximately 20-22 lb-ft (Actual figures may vary)
Carburetor:
Mikuni BSR33 (or similar)
Fuel Type:
Unleaded gasoline (87 octane or higher)
Ignition System:
CDI (Capacitor Discharge Ignition)
Oil Type:
Yamalube 4 (or equivalent SAE 10W-40 API SG or higher)
Starter System:
Electric Start
Transmission Type:
Yamaha Ultramatic Automatic Transmission (CVT)
Optional Transmissions:
N/A (Only Ultramatic offered)
Drive System:
Shaft Drive (Rear Wheel Drive for 4x2 model)
Gear Selection:
Forward (Hi/Lo), Neutral, Reverse
Transmission Fluid Type:
Yamaha Ultramatic Transmission Fluid (YUTLF) or equivalent ATF (Automatic Transmission Fluid) as specified in the manual.
Oil Change Interval:
Every 1,000 km (600 miles) or 6 months (refer to manual for exact owner's schedule).
Air Filter Maintenance:
Clean every 500 km (300 miles) or more frequently in dusty conditions; replace as needed.
Spark Plug Replacement:
Check at 1,000 km (600 miles), replace as needed (NGK CR7E or equivalent specified).
Valve Adjustment Interval:
Check at 1,000 km (600 miles) and adjust if necessary.
Engine Oil Spec:
SAE 10W-40 API SG or higher (e.g., Yamalube 4 10W-40)
Brake Fluid Spec:
DOT 3 or DOT 4 hydraulic brake fluid.
Coolant Type:
Air-cooled engine, no coolant required.
Common Wear Items:
Brake pads, tires, tie-rod ends, wheel bearings, carburetor jets due to ethanol fuels.
Performance Considerations:
Carburetor can be sensitive to altitude and temperature changes; proper jetting is key. Ultramatic CVT belt wear is a common maintenance item for all CVTs.
Manual Utility:
Provides essential information for keeping the Bruin 350 4x2 in optimal running condition, extending its lifespan and ensuring reliable performance.
Heritage:
Yamaha has a long-standing reputation for producing reliable and durable powersports vehicles, with a focus on engineering and performance.
Predecessors:
The Bruin series succeeded earlier Yamaha utility ATVs, building upon their robust designs. It was later updated and replaced by models like the Grizzly 350.
Successors:
The Bruin platform was a precursor to models like the Yamaha Grizzly 350 and other mid-displacement utility ATVs in Yamaha's lineup.
Manufacturing Location:
Typically manufactured in Japan or North America.
