Atv Segment:
Mid-size utility ATV, known for its versatility and user-friendliness, targeting recreational riders and light farm/ranch use.
Key Competitors:
Honda Rancher 350, Kawasaki Prairie 360, Suzuki Vinson 500 (though slightly larger), Polaris Sportsman 400/500.
Engine Type:
Reliable air-cooled, single-cylinder engine.
Drive System:
Selectable 4x2 drive, offering simplicity and fuel efficiency for general use.
Transmission:
Automatic (CVT) with high/low range and reverse, providing ease of operation.
Suspension:
Independent front suspension (IFS) and swingarm rear suspension, offering a comfortable ride and good ground clearance.
Engine Systems:
Engine overhaul, top-end rebuild, piston, rings, cylinder, valve adjustments, timing, lubrication system, cooling system, fuel delivery system (carburetor), ignition system, starting system, exhaust system.
Transmission Drivetrain Systems:
Automatic transmission (CVT - Continuously Variable Transmission) disassembly and assembly, clutch operation, belt replacement, gearbox servicing, drive shafts, differential (rear).
Braking Systems:
Hydraulic brake system, front and rear brake caliper service, brake pad replacement, brake fluid flush and bleeding, master cylinder, brake lines.
Suspension Steering Systems:
Front and rear suspension, shock absorber service, bushings, ball joints, tie rods, steering column, steering linkage, wheel alignment.
Electrical Systems:
Battery, charging system (stator, rectifier/regulator), lighting system (headlights, taillights, brake lights), ignition switch, starter motor, CDI unit, wiring diagrams, fuses, relays, horn.
Fuel System:
Fuel tank, fuel lines, fuel filter, carburetor (Mikuni BSR33), carburetor adjustment and cleaning, choke operation.
Chassis Bodywork Systems:
Frame inspection, body panel removal and installation, fenders, seat, handlebars, footrests, racks, skid plates.
Routine Maintenance:
Oil changes, filter replacements (oil, air, fuel), spark plug inspection and replacement, chain adjustment (if applicable, though Bruin 350 is shaft drive), tire pressure checks, lubrication points.
Troubleshooting:
Diagnostic procedures for common starting issues, running problems, electrical faults, and drivability concerns. Includes symptom-based troubleshooting charts.
Engine Repair:
Complete engine teardown, component inspection, overhaul procedures, piston ring replacement, cylinder honing, valve lapping, camshaft installation, timing chain/belt replacement (if applicable, though Bruin 350 uses a chain).
Transmission Repair:
CVT belt inspection and replacement, roller weight replacement, clutch adjustment, gearbox oil change and inspection, differential service.
Electrical Repair:
Wiring diagram interpretation, component testing (stator, ignition coil, starter motor), charging system diagnosis, light bulb replacement, fuse replacement.
Suspension Steering Adjustment:
Shock absorber preload adjustment, wheel alignment procedures, tie rod adjustments.
Carburetor Adjustment:
Idle speed adjustment, mixture screw adjustment, jetting information for altitude and temperature changes.
Depth Of Coverage:
Comprehensive, covering all aspects from routine maintenance and minor repairs to major overhauls and engine rebuilds. Includes detailed specifications, torque values, and diagnostic procedures.
Diagnostic Capabilities:
Advanced diagnostic trees and symptom analysis for identifying and resolving complex mechanical and electrical issues.
Repair Procedures:
Step-by-step instructions with accompanying diagrams and illustrations for virtually all repair and maintenance tasks.
โ๏ธ Engine Specifications
Engine Type:
4-stroke, SOHC, air-cooled
Bore X Stroke:
83.0 mm x 64.5 mm
Valve Clearance Intake Cold:
0.08 - 0.12 mm (0.003 - 0.005 in)
Valve Clearance Exhaust Cold:
0.10 - 0.14 mm (0.004 - 0.006 in)
Horsepower Estimate:
Approx. 18-20 HP (at 5500 rpm)
Torque Estimate:
Approx. 20-22 lb-ft (at 4500 rpm)
Carburetor Model:
Mikuni BSR33 (or similar)
Fuel Type:
Unleaded gasoline (87 octane minimum)
Fuel Tank Capacity:
3.8 L (1.0 US gal)
Engine Oil Change Interval:
Every 100 hours or 6 months, whichever comes first (typical, refer to manual for exact schedule).
Air Filter Cleaning:
Every 20 hours or 3 months (typical, clean more frequently in dusty conditions).
Spark Plug Inspection:
Every 100 hours or 6 months.
Valve Adjustment Interval:
Every 200 hours or 12 months.
Engine Oil Type:
Yamalube 4 (or equivalent) SAE 20W-40 API SG or higher.
Engine Oil Capacity With Filter:
Approximately 2.0 L (2.1 US qt).
Coolant Type:
Ethylene glycol-based antifreeze (50/50 mix with distilled water).
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid.
Common Wear Items:
CVT belt wear, brake pad wear, front suspension bushings, wheel bearings (especially with heavy use or submersion).
Carburetor Clogging:
Can occur with stale fuel or debris in the fuel system, requiring cleaning.
Starter Solenoid:
Occasionally can fail, preventing engine cranking.
Electrical Connector Corrosion:
Can happen in wet or muddy environments, affecting lights or ignition.
