🏷️ Basic Information Identification Make: Yamaha Model: Moto-4 Sub Model: 250 & 350 Product Type: Complete Workshop Service Repair Manual Applicable Years: 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995 Vehicle Type: All-Terrain Vehicle (ATV) 👋 Introduction Market Position Positioning: The Yamaha Moto-4 series was positioned as a reliable and capable utility ATV for recreational and light work applications during its production run. Competitive Analysis Competitors: Competed against models from Honda (e.g., TRX250, TRX300), Suzuki (e.g., QuadRunner series), and Kawasaki (e.g., Bayou series) during the late 1980s and 1990s. Key Features Manual Ease Of Use: Features easy-to-follow step-by-step instructions and numerous pictures to simplify repair and maintenance tasks. Accessibility: Instant email delivery upon payment, usable on various devices (PC, Mac, tablets, smartphones). Cost Saving: Enables owners to perform their own repairs, significantly reducing labor costs. 📋 Manual Details Coverage Areas Coverage: Comprehensive; All Models/Engines/Trim/Transmissions Types Covered Page Count Page Count: Undisclosed (estimated to be extensive due to 'A-Z' coverage) Manual Type Type: Workshop Service Repair Manual Language Language: English Format Format: Downloadable Digital Format (PDF compatible) 📖 Manual Coverage Systems Covered Engine: Engine overhaul, disassembly, assembly, tuning, diagnostics, lubrication system, cooling system, fuel system, exhaust system. Transmission: Transmission overhaul, disassembly, assembly, clutch service, gearbox repair, final drive. Electrical: Ignition system, starting system, charging system, lighting system, wiring diagrams, battery service, troubleshooting electrical faults. Chassis: Frame, suspension (front and rear), steering system, wheels, tires, brakes (front and rear). Bodywork: Body panels, fenders, seat, controls, decals, general maintenance. Troubleshooting: Diagnostic procedures for common and uncommon issues, fault finding charts. Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, chain lubrication and adjustment, brake pad inspection, tire pressure checks. Repair: Complete repair procedures for all major and minor components, from engine rebuilds to electrical system fixes. Disassembly Assembly: Detailed step-by-step instructions for taking apart and putting back together all vehicle systems and components. Tuning Adjustment: Carburetor tuning, ignition timing adjustments, suspension adjustments. Technical Depth Depth: Comprehensive; suitable for both novice DIY mechanics and experienced technicians. Covers basic maintenance to complex engine and transmission rebuilds. 📊 Manual Specifications File Format File Format: PDF (requires Adobe Reader) Print Quality Print Quality: High Quality (printable pages) Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine 250 Engine Type 250: Four-stroke, SOHC, air-cooled Displacement 250: 230cc - 246cc (exact figure varies by specific model year revision) Bore X Stroke 250: Approximately 69mm x 64mm (typical for this displacement class, specific values in manual) Compression Ratio 250: Around 9.2:1 to 10.2:1 (manual will specify exact) Primary Engine 350 Engine Type 350: Four-stroke, SOHC, air-cooled Displacement 350: 348cc - 350cc (exact figure varies by specific model year revision) Bore X Stroke 350: Approximately 80mm x 69mm (typical for this displacement class, specific values in manual) Compression Ratio 350: Around 8.4:1 to 9.2:1 (manual will specify exact) Performance Horsepower Estimate 250: Approx. 16-20 HP (manual will provide precise figures) Horsepower Estimate 350: Approx. 22-26 HP (manual will provide precise figures) Fuel System Carburetor: Single Mikuni carburetor (specific model number provided in manual for both 250 and 350 variants). Fuel Type: Unleaded gasoline (manual specifies octane rating requirement). 🔧 Transmission Standard Transmission Type: 5-speed manual transmission with automatic clutch (sometimes referred to as a 'semi-automatic' or 'wet multi-plate' clutch). Drive System: Shaft drive (2WD). Reverse: Yes (typically integrated into the transmission). Features Clutch Type: Automatic centrifugal clutch. Gear Ratios: Specific gear ratios for each gear and reverse are detailed in the manual. Fluid Specifications Transmission Oil Type: Yamaha recommends specific API SG or SH, SAE 10W-40 or 20W-40 viscosity motor oil (confirm with manual). 📐 Dimensions Exterior General Length Estimate: Approx. 75-80 inches (specific dimensions provided in manual). Width Estimate: Approx. 40-45 inches (specific dimensions provided in manual). Height Estimate: Approx. 40-45 inches (specific dimensions provided in manual). Weights Dry Weight Estimate: Approx. 400-450 lbs (specific figures for 250 and 350 models in manual). Ground Clearance Estimate: Approx. 6-8 inches (manual will detail exact clearance). 🛡️ Safety Features Ratings Safety Standards: Manufactured to meet ATV safety standards of the era; manual covers safe operating procedures and recommended safety gear. Active Features Braking System: Front: Drum or disc brakes (varies by model year). Rear: Drum or disc brake (varies by model year). Manual details specific brake system components and maintenance. Lighting: Headlight, taillight, and brake light for visibility and signaling. Passive Features Handlebars: Wide handlebars for control and stability. Seat: Contoured seat for rider comfort and positioning. 💡 Technology Features Infotainment Features: Basic functionality focused on operation. Features include standard handlebar controls, speedometer/odometer (model dependent), and indicator lights. Driver Assistance Features: None (ATV of this era did not incorporate advanced driver assistance systems). Connectivity Features: None (basic mechanical and electrical systems). 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 1,000...