This manual covers the YFM 350 Wolverine, a versatile All-Terrain Vehicle (ATV) first introduced in 1990. Renowned for its reliability and user-friendly design, the YFM 350 Wolverine has been a popular choice for recreational trail riding and general utility. Built with a commitment to engineering excellence, this ATV offers a robust 348cc four-stroke engine, a 5-speed manual transmission with an automatic clutch, and shaft drive, making it a capable and durable machine for various terrains. Its legacy is rooted in a long-standing reputation for producing high-quality and dependable ATVs, with the Wolverine series being a significant contributor to the recreational ATV market. This digital service and repair manual provides comprehensive guidance for owners, DIY mechanics, and professional technicians. It details essential maintenance procedures, including engine oil changes, air filter cleaning, and spark plug servicing, along with complete engine overhaul, cooling system maintenance, carburetor tuning, drivetrain repair, and chassis servicing. The manual also includes advanced diagnostic and troubleshooting procedures for both mechanical and electrical systems, covering everything from basic adjustments to complete component replacements. With its high-resolution, searchable format and English language content, this manual serves as an indispensable resource for maintaining the performance and longevity of your 1990 YFM 350 Wolverine. 🏷️ Basic Information Identification Make: Yamaha Model: YFM 350 Wolverine Year: 1990 Vehicle Type: All-Terrain Vehicle (ATV) Codes Chassis Code: YFM350ER 👋 Introduction Market Position Target Audience: Yamaha YFM 350 Wolverine 1990 owners, DIY mechanics, and professional service technicians. Competitive Analysis Manual Value Proposition: Comprehensive resource for maintaining and repairing the YFM 350 Wolverine, empowering users to perform their own maintenance and reducing reliance on costly professional services. Key Features Diagnostic Capabilities: Detailed troubleshooting flowcharts and symptom-to-cause analysis for efficient problem-solving. Maintenance Guidance: Proactive maintenance strategies to extend the life and optimize the performance of the ATV. Technical Drawings: Likely includes detailed exploded views and diagrams of key components (inferred from standard service manual content). 📋 Manual Details Coverage Areas Systems Covered: General Information, Specifications, Periodic Checks and Adjustment, Engine, Cooling System, Carburetion, Drive Train, Chassis, Electrical, Troubleshooting Page Count Estimated Pages: Refer to actual manual; typically 200-400 pages for comprehensive service manuals. Manual Type Type: Digital Service and Repair Manual Language Language: English Format Digital Format: PDF 📖 Manual Coverage Systems Covered Engine Overhaul: Complete engine disassembly, inspection, repair, and reassembly procedures. Cooling System Maintenance: Radiator, coolant, fan, thermostat inspection and replacement procedures. Fuel System Service: Carburetor tuning, cleaning, adjustment, and jetting information. Drivetrain Repair: Clutch, gearbox, driveshaft, differential inspection and repair. Chassis And Suspension: Frame inspection, steering system, suspension components, wheel bearing service. Electrical System Diagnosis: Wiring diagrams, ignition system, lighting, battery, starter, and charging system troubleshooting. Procedures Included Preventative Maintenance: Recommended service intervals for oil changes, filter replacements, lubrication, and inspections. Troubleshooting Guide: Step-by-step diagnostic procedures for common and uncommon issues. Adjustment Procedures: Detailed instructions for adjusting brakes, clutch, carburetor, and suspension. Component Replacement: Guidance on replacing wear items and major components. Technical Depth Diagnostic Level: Advanced diagnostics and troubleshooting for both mechanical and electrical systems. Repair Scope: Covers from basic adjustments to complete engine and drivetrain rebuilds. 📊 Manual Specifications File Format PDF Quality: High-resolution, searchable PDF for easy navigation and printing. Print Quality Printable: Yes, designed to be printed for workshop use. Binding Type Digital Binding: N/A (Digital File) Paper Type Digital Paper Type: N/A (Digital File) ⚙️ Engine Specifications Primary Engine Engine Type: Four-stroke, SOHC, Air-cooled Displacement: 348cc Bore X Stroke: 83.0 mm x 64.5 mm Compression Ratio: 9.7:1 Performance Horsepower Rating: Approx. 20-22 HP (figures may vary based on source and specific tuning). Torque Rating: Not explicitly stated, but expected for its class. Fuel System Carburetor Type: Mikuni VM32SS (likely) Fuel Type: Unleaded gasoline Lubrication System Oil Type: Yamaha recommends SAE 10W-30 API SG or SH classification (refer to manual for exact specification). Oil Capacity: Refer to manual; typically around 1.6-1.8 Liters (1.7-1.9 US qt). 🔧 Transmission Standard Transmission Type: 5-speed manual with automatic clutch Drive System: Shaft drive, 2WD Features Reverse: Yes Fluid Specifications Gear Oil Type: Yamalube Gear Oil (or equivalent API GL-4, SAE 80W-90) (refer to manual for exact specification). 📐 Dimensions Exterior Length: Approx. 1835 mm (72.2 in) Width: Approx. 1050 mm (41.3 in) Height: Approx. 1075 mm (42.3 in) Wheelbase: Approx. 1210 mm (47.6 in) Weights Dry Weight: Approx. 214 kg (472 lbs) Ground Clearance: Approx. 130 mm (5.1 in) 🛡️ Safety Features Ratings Atv Safety Considerations: ATVs are not designed for on-road use. Always wear a helmet and appropriate safety gear. Operate within your skill level and adhere to local regulations. Active Features Braking System: Hydraulic disc brakes front and rear. 💡 Technology Features Infotainment Display Features: Basic instrumentation: speedometer, odometer, neutral indicator, high-beam indicator, oil warning light (typical for this era). Driver Assistance Atv Safety Assist: No electronic driver assistance systems; relies on rider skill...