Atv Segment:
Entry-level to mid-range utility ATV, popular for recreational trail riding and light work.
Competitors 1980S:
Competed with models from Honda (e.g., TRX250), Suzuki (e.g., QuadRunner LT250), Kawasaki (e.g., Bayou 220).
Engine Type:
Air-cooled, four-stroke, single-cylinder engine.
Drivetrain Type:
Shaft drive, providing reliable and low-maintenance power delivery.
Transmission Type:
5-speed manual transmission with reverse gear, offering versatility.
Suspension Setup:
Independent front A-arm suspension (on some variants, check specific model year) and rear swingarm with monoshock or twin shocks.
Braking System:
Drum brakes front and rear, known for simplicity and durability.
Engine:
Disassembly, assembly, inspection, troubleshooting, overhaul of the 223cc engine.
Fuel System:
Carburetor tuning, cleaning, repair, fuel tank, fuel pump diagnostics.
Ignition System:
CDI ignition, spark plug specifications, testing, troubleshooting.
Transmission:
5-speed manual transmission, clutch operation, adjustment, disassembly, and assembly.
Drivetrain:
Shaft drive system, universal joints, differential maintenance.
Suspension:
Front telescopic forks, rear swingarm suspension, shock absorber servicing.
Brakes:
Front and rear drum brake systems, brake shoe replacement, cable adjustment.
Electrical System:
Lighting, battery, charging system (stator, rectifier/regulator), starter motor, wiring diagrams.
Frame And Bodywork:
Chassis inspection, body panel removal and installation, handlebar, controls.
Wheels And Tires:
Tire pressure, wheel bearing maintenance, rim specifications.
Routine Maintenance:
Oil changes, filter replacements, air filter cleaning, spark plug checks, chain lubrication (if applicable, though shaft drive).
Troubleshooting:
Step-by-step diagnostic guides for common and uncommon problems.
Repair Procedures:
Detailed instructions for disassembly, repair, and reassembly of all major components.
Tune Up:
Carburetor synchronization and adjustment, ignition timing checks.
Overhaul:
Engine top-end and bottom-end overhaul procedures.
Wiring Diagrams:
Complete electrical system schematics for accurate troubleshooting.
Depth:
Professional-level repair and diagnostics, suitable for experienced mechanics and advanced DIY enthusiasts.
Engine Type:
Air-cooled, four-stroke, SOHC, single-cylinder
Displacement:
223 cc (cc)
Bore X Stroke:
67.0 mm x 64.0 mm (approximate)
Compression Ratio:
9.2:1 (approximate)
Carburetor Model:
Mikuni VM30SS (typical, verify with manual)
Ignition System:
CDI (Capacitor Discharge Ignition)
Horsepower:
Approx. 14-17 HP @ 6500 RPM (estimated, depends on tuning and specific model year)
Torque:
Approx. 13-15 lb-ft @ 5000 RPM (estimated)
Fuel Type:
Unleaded gasoline (87 octane recommended)
Fuel Tank Capacity:
Approx. 2.6 gallons (9.8 Liters)
Length:
Approx. 71.3 inches (1810 mm)
Width:
Approx. 42.1 inches (1070 mm)
Height:
Approx. 40.4 inches (1025 mm)
Wheelbase:
Approx. 47.6 inches (1208 mm)
Dry Weight:
Approx. 322 lbs (146 kg)
Curb Weight:
Approx. 340-350 lbs (154-159 kg)
Atv Safety Standards:
Designed to meet relevant ATV safety standards of its era.
Braking System:
Dual leading shoe drum brakes front and rear for effective stopping power.
Throttle Limiter:
Some models may feature a throttle limiter screw for controlled acceleration.
Handlebar Design:
Ergonomic handlebar with comfortable grip positions.
Footwells:
Wide, integrated footwells for rider support and protection.
Dashboard Features:
Basic instrument cluster including speedometer, odometer, and warning lights (neutral, oil pressure, high beam).
Atv Assistance Features:
None inherent to the design, focus is on mechanical reliability.
Connectivity Features:
N/A
Engine Oil Change:
Every 1,000 km (600 miles) or annually, whichever comes first.
Air Filter Cleaning:
Every 3 months or 500 km (300 miles), more frequently in dusty conditions.
Spark Plug Check:
Every 1,000 km (600 miles)
Valve Clearance Check:
Every 6,000 km (3,700 miles) or annually.
Brake Adjustment:
As needed, typically every 6 months or 3,000 km (1,800 miles).
Engine Oil Type:
Yamalube 4W SAE 10W-30 or SAE 20W-40 API SG classification
Engine Oil Capacity:
Approx. 1.6 Liters (1.7 US qt) without filter change; 1.8 Liters (1.9 US qt) with filter change.
Transmission Oil Type:
Yamalube Gear Oil SAE 80W API GL-4
Transmission Oil Capacity:
Approx. 0.95 Liters (1.0 US qt)
Carburetor Issues:
Can be prone to clogging if fuel is not fresh or if air filter is neglected. Float bowl seal leakage.
Electrical System Ageing:
Wiring harness connectors can corrode over time, leading to intermittent electrical faults.
Suspension Wear:
Front fork seals can leak with age and use; rear shock absorber may lose damping effectiveness.
Brake Performance:
Drum brakes require regular adjustment and can be less effective when wet. Brake shoes wear over time.
Yamaha Atv Introduction:
Yamaha has a long-standing history in ATV manufacturing, beginning with the revolutionary three-wheeled AT-1 in the 1970s, evolving to the four-wheel era with models like the Moto-4.
Moto 4 Lineup:
The Moto-4 series was a key player in Yamaha's transition to four-wheeled ATVs, offering reliable performance and a robust design.
Moto 4 225 Positioning:
The 225cc model served as an accessible option for recreational riders, positioned below the larger capacity Moto-4 models.
Production Period:
Mid-to-late 1980s
