🏷️ Basic Information Identification Make: Yamaha Model: YFM 350 Wolverine Year: 1987 Vehicle Type: All-Terrain Vehicle (ATV) Codes Engine Code: 3GD-XXXXXX (Specific engine serial number ranges will vary) 👋 Introduction Market Position Market Position: The Yamaha YFM 350 Wolverine was a popular recreational ATV in the late 1980s, known for its robust design and capable performance in various terrains. This manual targets owners and technicians looking to maintain and repair this specific model. Competitive Analysis Competitive Analysis: Competed with models from Honda (e.g., TRX 350), Suzuki (e.g., QuadRunner 4x4), and Kawasaki (e.g., Bayou 300). The Wolverine often stood out for its comfortable ride and utility features. Key Features Key Features: Designed for recreational trail riding and utility tasks. Introduced Yamaha's torque-converter automatic transmission on some variants, offering ease of use. Known for its durable chassis and reliable engine. 📋 Manual Details Coverage Areas Coverage Areas: General Information, Specifications, Periodic Checks and Adjustment, Engine, Cooling System, Carburetion, Drive Train, Chassis, Electrical, Troubleshooting Page Count Page Count: Not specified in product information, typically 200-400 pages for a comprehensive service manual. Manual Type Manual Type: Service and Repair Manual Language Language: English Format Format: PDF Compatibility Software Requirements: Adobe PDF Reader (or compatible PDF viewer) Operating Systems: All versions of Windows & Mac, Smartphones, Tablets Features Interactive Features: Zoom in/out functionality 📖 Manual Coverage Systems Covered Systems Covered: Engine internal components (cylinder, piston, crankshaft, valves), Carburetor systems, Fuel delivery, Ignition system, Cooling system (radiator, fan, coolant flow), Transmission (gearbox, clutch), Drivetrain (drive shafts, differential if applicable, chain drive system), Suspension (front and rear), Steering system, Braking system (front and rear), Electrical system (wiring diagrams, lighting, battery, starting system), Frame and body components, Wheels and tires. Procedures Included Procedures Included: Routine maintenance checks and adjustments, Engine disassembly and reassembly, Carburetor cleaning and adjustment, Transmission service, Drivetrain inspection and repair, Suspension component replacement, Brake system bleeding and repair, Electrical system troubleshooting and repair, Diagnostic procedures for common faults, Recommended service intervals, Fluid specifications and capacities, Torque specifications for critical fasteners. Technical Depth Technical Depth: Comprehensive, covering both routine maintenance and in-depth repair procedures. Suitable for both experienced mechanics and DIY enthusiasts. Includes detailed step-by-step instructions, illustrations, and diagnostic flowcharts. Troubleshooting Depth Troubleshooting Depth: Detailed troubleshooting guides with symptoms, probable causes, and corrective actions for various mechanical and electrical issues. Includes diagnostic flowcharts. Repair Procedures Repair Procedures: Step-by-step instructions for component removal, inspection, repair, and reinstallation. Includes critical torque values, clearances, and specifications. 📊 Manual Specifications File Format File Format: PDF Print Quality Print Quality: High resolution, optimized for digital viewing and printing. Clear text and legible diagrams. Binding Type Binding Type: N/A (Digital Format) Paper Type Paper Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Primary Engine: 348cc, Air-Cooled, 4-Stroke, SOHC, Single-Cylinder Performance Horsepower: Approximately 20-22 HP (Est. for 1987 model) Torque: Approximately 20-22 lb-ft (Est. for 1987 model) Fuel System Fuel System: Carburetor (likely a Mikuni BS34 or similar) Bore X Stroke Bore X Stroke: 83.0 mm x 64.5 mm (Est.) Compression Ratio Compression Ratio: 9.2:1 (Est.) Ignition System Ignition System: CDI (Capacitor Discharge Ignition) Oil Capacity Oil Capacity: Approximately 2.0-2.5 Liters (with filter change). Specific capacity requires manual verification. Spark Plug Spark Plug: NGK DPR7EA-9 or equivalent (Requires manual verification for exact type and gap). 🔧 Transmission Standard Standard Transmission: Automatic (Yamaha's Ultramatic or Torque Converter Automatic Transmission) Optional Optional Transmission: Not applicable for this model year; typically offered with the automatic transmission. Features Features: Continuously Variable Transmission (CVT) with high/low range and reverse on some variants. Smooth power delivery and ease of operation. Transmission Fluid Transmission Fluid: Yamalube (or equivalent API GL-4 Gear Oil). 📐 Dimensions Exterior Overall Length: Approximately 72.0 inches (1829 mm) Overall Width: Approximately 42.0 inches (1067 mm) Overall Height: Approximately 43.0 inches (1092 mm) Weights Dry Weight: Approximately 490 lbs (222 kg) Ground Clearance: Approximately 5.5 inches (140 mm) Wheels Tires Front Tire Size: AT22x8-12 (Requires manual verification for specific ply rating) Rear Tire Size: AT22x10-10 (Requires manual verification for specific ply rating) Wheel Bolt Pattern: 4x110mm (Typical for Yamaha ATVs of this era) 🛡️ Safety Features Ratings Ratings: N/A (ATVs are not typically rated by NHTSA or IIHS in the same way as cars/trucks. Safety is primarily dictated by rider skill and adherence to manufacturer recommendations.) Active Features Active Features: Front and rear drum brakes (disc brakes may be present on some variants, manual verification needed). Neutral safety start. Passive Features Passive Features: Full floorboards with heel guards, Thumb throttle with a safety trigger, Handlebar grips, Reflectors. 💡 Technology Features Infotainment Infotainment: N/A (As an ATV from 1987, it does not feature modern infotainment systems.) Driver Assistance Driver Assistance: N/A (No electronic driver assistance features like ABS or traction control are present.) Connectivity Connectivity: N/A 🔧 Maintenance Service Intervals Service Intervals: Initial service at 100-200 miles....