Product Segment:
Mid-size utility ATV, known for its ruggedness, reliability, and 4WD capability, making it popular for recreational trail riding, light farming, and hunting.
Key Competitors:
Honda FourTrax 350/420, Suzuki KingQuad 300/400, Kawasaki Brute Force 300/400, Polaris Sportsman 400/500.
Vehicle Highlights:
Proven air-cooled engine, reliable automatic transmission (Ultramatic), sturdy chassis, 4WD with limited-slip front differential, comfortable seating, and practical cargo racks.
Engine:
Complete disassembly, inspection, repair, and reassembly of the engine, including top-end (cylinder head, piston, valves), bottom-end (crankshaft, connecting rod, bearings), and lubrication system.
Fuel System:
Carburetor (Mikuni BSR33), fuel pump, fuel lines, fuel tank, and associated components. Includes adjustments, cleaning, and troubleshooting.
Cooling System:
Radiator, fan, coolant hoses, thermostat, and water pump. Includes maintenance, flushing, and component testing.
Transmission Drivetrain:
Automatic transmission (CVT - Ultramatic), drive shaft, differential gears (front and rear), wheel hubs, and CV joints. Includes fluid changes, inspection, and repair procedures.
Suspension:
Front independent double A-arm suspension, rear swingarm suspension. Includes shock absorbers, springs, bushings, ball joints, and steering components. Torque specifications for all fasteners.
Brakes:
Hydraulic disc brakes (front and rear), brake lines, master cylinders, calipers, and brake pads. Includes bleeding procedures, pad replacement, and rotor inspection.
Electrical System:
Ignition system (CDI), starter motor, battery, charging system (stator, rectifier/regulator), lighting, and wiring harness. Includes wiring diagrams, troubleshooting guides, and component testing.
Chassis Frame:
Frame inspection, welding repairs (if applicable), and alignment checks.
Bodywork Trim:
Fenders, racks, seat, handlebars, and plastic body panels. Removal, installation, and minor repair guidance.
Routine Maintenance:
Oil changes, filter replacements (oil, air), spark plug checks/replacement, chain/belt adjustments, lubrication points, tire pressure checks.
Troubleshooting:
Diagnostic procedures for common issues such as starting problems, poor performance, electrical faults, and braking issues, often presented with symptom-cause-remedy tables.
Component Overhaul:
Detailed step-by-step instructions for rebuilding major components like the engine, transmission, and carburetor.
Specifications:
All critical torque values, clearances, fluid capacities, and electrical resistance values required for accurate assembly and diagnostics.
Special Tools:
Identification and usage of specialized tools recommended or required for specific repair procedures.
Depth:
Comprehensive. Designed for professional mechanics and advanced DIY enthusiasts, covering everything from basic fluid changes to full engine and transmission rebuilds.
Engine Type:
Four-stroke, SOHC, air-cooled
Displacement:
348 cc (21.2 cu. in.)
Bore X Stroke:
83.0 mm x 64.5 mm (3.27 in x 2.54 in)
Horsepower Est:
Approx. 20-22 HP (at flywheel, may vary slightly by region/tuning)
Torque Est:
Approx. 27-29 Nm (at flywheel, may vary slightly)
Carburetor Model:
Mikuni BSR33, single
Fuel Type:
Unleaded gasoline, 87 octane (minimum)
Ignition System:
CDI (Capacitor Discharge Ignition)
Oil Type:
Yamalube 4 (or equivalent) SAE 10W-40, API Service SG or higher
Oil Capacity W Filter:
Approx. 1.8 L (1.9 US qt)
Coolant Type:
Ethylene glycol-based coolant, 50/50 mix with distilled water
Transmission Type:
Automatic Continuously Variable Transmission (CVT) with Yamaha Ultramatic® system
Drive Modes:
High, Low, Neutral, Reverse, Park
Drive System:
Shaft Drive (4WD)
Differential Front:
Limited Slip
Differential Rear:
Locked (when 4WD engaged)
Transmission Fluid Type:
Yamaha All-Purpose Gear Oil (or equivalent), API GL-4, SAE 80
Transmission Fluid Capacity
Final Drive Capacity:
Approx. 0.25 L (0.26 US qt)
Atv Safety Standards:
Meets ANSI standards for recreational ATVs.
Braking System:
Hydraulic disc brakes (front and rear) with parking brake mechanism.
Engine Braking:
Integrated engine braking provided by the Ultramatic CVT system.
Handlebars:
Contoured handlebars with thumb throttle for controlled acceleration and grip.
Seat:
Comfortable, well-padded seat for rider stability and comfort during operation.
Lighting:
Dual 30W Krypton headlights, 30W Krypton brakelight/taillight.
Infotainment Features:
Basic, focused on functionality rather than entertainment. Features include speedometer, odometer, trip meter, hour meter, and indicator lights (4WD, neutral, reverse, oil level).
Driver Assistance Features:
Limited. Primary driver assistance is the Ultramatic CVT system's 'trickle' downhill engine braking and the limited-slip front differential for improved traction.
Connectivity Features:
None in terms of modern electronic connectivity (e.g., Bluetooth, GPS).
Engine Oil Change:
Every 1000 km (600 miles) or 6 months, whichever comes first.
Oil Filter Replacement:
Every 1000 km (600 miles) or 6 months, whichever comes first.
Air Filter Cleaning:
Every 500 km (300 miles) or as needed in dusty conditions. Replacement interval varies.
Spark Plug Check:
Every 1000 km (600 miles)
Valve Clearance Check:
Every 4000 km (2500 miles)
Cv Belt Inspection:
Every 2000 km (1200 miles)
Engine Oil Spec:
Yamalube 4 (or equivalent) SAE 10W-40, API Service SG or higher
Transmission Gear Oil Spec:
Yamaha All-Purpose Gear Oil (or equivalent), API GL-4, SAE 80
Brake Fluid Spec:
DOT 3 or DOT 4 hydraulic brake fluid
Common Wear Items:
CV boots, brake pads, wheel bearings, steering components (tie rod ends, ball joints) due to typical operating conditions.
Carburetor Fouling:
Can occur with infrequent use or contaminated fuel, requiring cleaning and adjustment.
Overheating Potential:
While air-cooled, prolonged high-load operation in extreme heat can stress the engine; proper maintenance of cooling fins and airflow is important.
