🏷️ Basic Information Identification Make: Yamaha Model: YFM225 Moto 4 Year: 1987 Vehicle Type: All-Terrain Vehicle (ATV) Category: Sport/Utility ATV 👋 Introduction Market Position Positioning: The Yamaha YFM225 Moto 4 was positioned as an entry-level to mid-range sport/utility ATV, appealing to riders seeking versatility for recreation and light work. Competitive Analysis Competitors: Competed with offerings from Honda (e.g., TRX250), Kawasaki (e.g., KLF220 Bayou), and Suzuki (e.g., LT-F250 QuadRunner). Key Features Key Features: Known for its reliable air-cooled engine, shaft drive for reduced maintenance, and comfortable riding position. Value Proposition Value: This manual provides essential information for owners to maintain and operate their 1987 Yamaha YFM225 Moto 4 safely and effectively, preserving its longevity and performance. 📋 Manual Details Coverage Areas Manual Type: Owner's/Operator's Manual Page Count Page Count: 118 Language Language: English Format Format: PDF Features Indexed Bookmarked Searchable: True Zoom Functionality: True Printability: Pages, Sections, Chapters, Diagrams, Charts, Partials or Totally 📖 Manual Coverage Systems Covered Engine System: Detailed coverage of the engine, including components, operation, and basic maintenance. Fuel System: Information on the carburetor, fuel tank, fuel lines, and filtration. Ignition System: Spark plug, ignition coil, and CDI unit specifications and maintenance. Transmission System: Operation and maintenance of the automatic transmission. Drive System: Details on the shaft drive system and differential. Suspension System: Front and rear suspension components, adjustments, and maintenance. Braking System: Front and rear brake operation, maintenance, and fluid specifications. Electrical System: Battery, lighting, starter motor, and basic wiring diagrams. Cooling System: Air-cooled engine operation and related components. Steering System: Handlebar, steering column, and tie rod maintenance. Frame And Body: Basic inspection of frame and body components. Lighting System: Headlight, taillight, and brake light operation and bulb replacement. Controls And Instruments: Explanation of dashboard indicators, controls, and their functions. Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug inspection/replacement, chain/drive shaft lubrication. Pre Ride Inspection: Checklists and guidelines for safe operation before each ride. Troubleshooting: Guidance for identifying and resolving common operational issues. Lubrication: Specific points and types of lubricants for various components. Adjustments: Carburetor idle, throttle cable, and brake lever adjustments. Wheel And Tire Maintenance: Information on tire pressure, inspection, and potentially wheel bearing checks. Technical Depth Depth: Comprehensive owner-level maintenance and operation. Focuses on what the user can and should do to maintain their ATV. Diagnostic Capabilities: Basic troubleshooting for common issues like starting problems, poor running conditions, and electrical faults. 📊 Manual Specifications File Format File Type: PDF Digitization Quality: Scanned - Good Interactivity Searchable Text: True Bookmarking: True Zoom In Out: True Printability Printable Options: Full or partial document printing. ⚙️ Engine Specifications Primary Engine Engine Type: Four-stroke, SOHC Displacement: 223cc Cooling System: Air-cooled Bore X Stroke: 66 mm x 65 mm Compression Ratio: 9.2:1 Ignition: CDI (Capacitor Discharge Ignition) Starter: Electric Start Performance Horsepower Estimate: ~14-16 HP (estimated, not officially published for this model year) Torque Estimate: ~14-16 lb-ft (estimated, not officially published for this model year) Fuel System Carburetor: Mikuni VM26SS (or similar) Fuel Type: Unleaded gasoline (87 octane recommended) Fuel Tank Capacity: 2.6 US gallons (9.8 L) 🔧 Transmission Standard Transmission Type: Automatic (Continuously Variable Transmission - CVT based, though often referred to as automatic clutch and belt drive) Features Drive Type: Shaft Drive (2WD) Fluid Specifications Transmission Oil Type: Yamalube 4 (or equivalent SAE 10W-30 API SE, SF or SG) Transmission Oil Capacity: 0.6 US quarts (0.58 L) 📐 Dimensions Exterior Length: 72.4 inches (1839 mm) Width: 38.4 inches (975 mm) Height: 42.3 inches (1074 mm) Wheelbase: 47.6 inches (1209 mm) Weights Dry Weight: 370 lbs (168 kg) Tires Front Tire Size: AT18 x 7-7 Rear Tire Size: AT20 x 10-9 Ground Clearance Ground Clearance: 5.3 inches (135 mm) 🛡️ Safety Features Ratings Atv Safety Standards: Adherence to relevant ATV safety guidelines of the era. Active Features Braking System Description: Hydraulic disc front brakes, mechanical drum rear brake. Lever-actuated. Passive Features Throttle Limiter: Not explicitly mentioned as a user-adjustable feature, but designed for controllable acceleration. Operational Safety Safety Warnings: Manual emphasizes safe riding practices, protective gear, and understanding terrain. 💡 Technology Features Infotainment Infotainment System: N/A (This model predates typical ATV infotainment systems.) Driver Assistance Driver Assistance Features: N/A (No electronic driver assistance systems.) Connectivity Connectivity Features: N/A (No electronic connectivity features.) 🔧 Maintenance Service Intervals Engine Oil Change Interval: Every 600 miles or 6 months (whichever comes first), or more frequently with severe use. Air Filter Cleaning: Clean every 300 miles or 3 months, replace as needed. Spark Plug Inspection: Inspect every 600 miles or 6 months. Brake Fluid Replacement: Recommended every 12 months or as needed based on inspection. Valve Clearance Check: Recommended every 1200 miles or 12 months. Fluid Specifications Engine Oil Spec: Yamalube 4 (or API SE, SF, SG classified 10W-30) Brake Fluid Spec: DOT 3 or DOT 4 brake fluid Grease Type:...