🏷️ Basic Information Identification Make: Yamaha Model: Moto-4 225 Model Designation: YFM225 Years Covered: 1986, 1987, 1988 Codes Vin Decoder Start Year: 1986 Vin Decoder End Year: 1988 👋 Introduction Market Position Atv Segment: Entry-level to mid-range utility ATV, popular for recreational trail riding and light work. Competitive Analysis Competitors 1980S: Competed with models from Honda (e.g., TRX250), Suzuki (e.g., QuadRunner LT250), Kawasaki (e.g., Bayou 220). Key Features 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. 📋 Manual Details Coverage Areas General Coverage: Comprehensive service and repair for the Yamaha Moto-4 225 ATV. Page Count Estimated Pages: 300-400 Manual Type Type: Service/Repair Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered 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. Procedures Included 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. Technical Depth Depth: Professional-level repair and diagnostics, suitable for experienced mechanics and advanced DIY enthusiasts. 📊 Manual Specifications File Format Digital Format: PDF Print Quality Image Resolution: High-resolution for clear viewing of diagrams and text. Binding Type Physical Manual Binding: N/A (Digital Format) Paper Type Physical Manual Paper: N/A (Digital Format) Searchability Text Searchability: Yes, allows for keyword searching within the document. ⚙️ Engine Specifications Primary Engine 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) Performance 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 System Fuel Type: Unleaded gasoline (87 octane recommended) Fuel Tank Capacity: Approx. 2.6 gallons (9.8 Liters) 🔧 Transmission Standard Transmission Type: 5-speed constant mesh with reverse Clutch Type: Wet, multiple disc, cable-actuated Drive Type: Shaft drive to rear wheels Features Gear Selection Method: Foot shifter Final Drive: Shaft Drive 📐 Dimensions Exterior 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) Weights Dry Weight: Approx. 322 lbs (146 kg) Curb Weight: Approx. 340-350 lbs (154-159 kg) 🛡️ Safety Features Ratings Atv Safety Standards: Designed to meet relevant ATV safety standards of its era. Active Features 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. Passive Features Handlebar Design: Ergonomic handlebar with comfortable grip positions. Footwells: Wide, integrated footwells for rider support and protection. 💡 Technology Features Infotainment Dashboard Features: Basic instrument cluster including speedometer, odometer, and warning lights (neutral, oil pressure, high beam). Driver Assistance Atv Assistance Features: None inherent to the design, focus is on mechanical reliability. Connectivity Connectivity Features: N/A 🔧 Maintenance Service Intervals 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). Fluid Specifications 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) Known Issues Carburetor Issues: Can be prone to clogging if fuel is not fresh or if air filter is neglected....