🏷️ Basic Information Identification Make: Yamaha Model: MOTO-4 250 Model Designation: ATV / UTV Years Covered: 1989, 1990, 1991 Codes Chassis Code Prefix: YFM250 👋 Introduction Market Position Target Audience: Yamaha MOTO-4 250 owners seeking to perform maintenance, repairs, or understand their ATV's operation Competitive Analysis Value Proposition: Provides comprehensive, accurate, and easily searchable information for a specific model range, including hard-to-find owner's manuals for older vehicles. Key Features Uniqueness: Combination of a detailed workshop manual and a printable owner's manual, specifically curated and confirmed for the 1989-1991 MOTO-4 250. Usability: Searchable PDF format with bookmarks enhances user experience and efficiency. 📋 Manual Details Coverage Areas Primary Coverage: Comprehensive Workshop Repair and Owner's Maintenance Scope: Wheel to Wheel, Full ATV/UTV Coverage Page Count Estimated Pages Service Manual: Varies by specific model year, typically 200-400 pages Estimated Pages Owner Manual: Varies by specific model year, typically 50-100 pages Manual Type Service Manual: Workshop Repair Manual Owner Manual: Maintenance Manual / Operator's Guide Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine: Engine rebuild, valve jobs, troubleshooting, internal components Transmission: Transmission overhaul, clutch, gearbox, driveline Suspension: Front and rear suspension components, adjustments, repair Electrical System: Wiring diagrams, ignition, lighting, charging system, troubleshooting Braking System: Brake caliper, master cylinder, fluid, service procedures Fuel System: Carburetor, fuel lines, fuel pump (if applicable), tank Cooling System: Cooling fan, radiator, coolant, if liquid-cooled Exhaust System: Muffler, exhaust pipe, heat shields Chassis And Frame: Frame inspection, steering components, wheel hubs Bodywork And Plastics: Fender, body panels, seating, handlebar Procedures Included Maintenance: Scheduled maintenance, adjustments, fluid changes, lubrication Troubleshooting: Diagnostic procedures, common problems, fault finding Repair: Component disassembly, assembly, replacement, and repair Rebuilds: Engine rebuild, transmission overhaul, carburetor rebuild Adjustments: Carburetor adjustment, chain tension, brake lever adjustment Installation: Optional accessory installation guidance (where applicable) Technical Depth Depth Level: Expert level, suitable for professional mechanics and experienced DIYers Detail Level: Detailed procedures with pictures Diagrams: Exploded parts diagrams for component identification and reassembly 📊 Manual Specifications File Format File Type: PDF Searchability: Keyword searchable (Ctrl+F enabled) Bookmarking: Bookmarked for easy navigation Print Quality Print Readability: High quality, optimized for printing Binding Type Binding: Digital PDF (no physical binding) Paper Type Paper: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Type: Four-stroke, single-cylinder, SOHC, air-cooled Displacement: 230 cc (approximate, based on common MOTO-4 250 configurations) Bore X Stroke: Typically around 68.5 mm x 64 mm (verify with specific manual) Compression Ratio: Typically around 9.0:1 to 9.5:1 (verify with specific manual) Performance Horsepower: Approximately 15-20 HP (varies by year and tuning) Torque: Approximately 13-16 lb-ft (varies by year and tuning) Fuel System Carburetor Type: Mikuni VM series (e.g., VM26SS or similar) Fuel Type: Unleaded gasoline Fuel Tank Capacity: Typically 2.5 - 3.0 gallons (verify with specific manual) Lubrication Oil Type: SAE 10W-30 or 10W-40 motorcycle-specific or ATV engine oil (API SG or higher) Oil Capacity: Approximately 1.5 - 1.8 quarts (verify with specific manual) 🔧 Transmission Standard Transmission Type: 5-speed constant mesh, manual clutch Optional Optional Transmission: N/A (Standard manual transmission) Features Clutch Type: Wet, multi-disc Final Drive: Chain drive Fluid Specifications Transmission Oil Type: Yamaha Genuine Gear Oil or equivalent SAE 80W API GL-4 (verify with specific manual) Transmission Oil Capacity: Approximately 0.7 - 0.9 quarts (verify with specific manual) 📐 Dimensions Exterior Length: Approx. 72-75 inches (verify with specific manual) Width: Approx. 40-43 inches (verify with specific manual) Height: Approx. 43-46 inches (verify with specific manual) Weights Dry Weight: Approx. 380-400 lbs (verify with specific manual) Curb Weight: Approx. 400-420 lbs (verify with specific manual) Payload Capacity: Typically 200-300 lbs (verify with specific manual) Wheels And Tires Front Tire Size: AT23x8-12 or AT24x8-12 (verify with specific manual) Rear Tire Size: AT23x10-10 or AT24x10-10 (verify with specific manual) Wheel Bolt Pattern: 4x110 mm (verify with specific manual) 🛡️ Safety Features Ratings Atv Safety Standards: Meets relevant industry safety standards for ATVs of its era. Active Features Braking System: Front and rear drum brakes or disc brakes (depending on specific model year and trim), operated by handlebar levers and foot pedal. Passive Features Lighting: Headlight, taillight/brake light for visibility. Handlebar Design: Ergonomic handlebar with handgrips for control and comfort. 💡 Technology Features Infotainment Infotainment Features: N/A (Basic ATV design focused on functionality, not infotainment). Driver Assistance Driver Assistance Features: N/A (No electronic driver assistance systems). Connectivity Connectivity Features: N/A (No electronic connectivity features). 🔧 Maintenance Service Intervals Oil Change Interval: Every 1,000 miles or 6 months (refer to manual for precise intervals). Air Filter Cleaning: Every 500 miles or annually (more frequently in dusty conditions). Spark Plug Replacement: Every 6,000 miles (verify specific plug type and gap). Valve Clearance Check: Every 6,000 miles or annually. Chain Lubrication And Adjustment: Every 300 miles or after washing/wet riding. Fluid Specifications Brake Fluid Type: DOT 3 or DOT 4 (verify...