🏷️ Basic Information Identification Make: Yamaha Model: Banshee 350 Year: 1991 Model Code: YFZ350 Generation Generation Designation: First Generation (1987-1992) Codes Vin Prefix: JY 👋 Introduction Market Position Vehicle Market Segment: High-performance sport ATV, renowned for its power and agility in its era. Positioned as a recreational and competitive off-road vehicle. Competitive Analysis Key Competitors Era: Competed against other high-performance ATVs of the late 80s and early 90s, such as certain models from Suzuki (e.g., LT250R, LT500R) and Kawasaki (e.g., Tecate-4). Key Features Vehicle Key Selling Points: Powerful twin-cylinder 2-stroke engine, liquid cooling, 6-speed transmission, long-travel suspension, and sporty chassis design. Its reputation for power and customization potential made it a favorite. Manual Value Proposition Manual Benefit For Owner: Empowers owners and technicians to perform professional-level maintenance and repairs, saving on dealership labor costs and ensuring optimal performance and longevity of the vehicle. It's the dealer's primary technical resource. 📋 Manual Details Coverage Areas Systems Covered List: • General Information • Maintenance • Engine Removal and Installation • Engine Fuel System • Engine Lubrication and Cooling • Engine Combustion System • Transmission System • Front Wheel and Steering System • Rear Wheel System • Fenders and Exhaust Pipe • Electrical System • Troubleshooting Page Count Page Count: 320+ Manual Type Manual Type: Factory Service Manual Language Language: English Format Format: Printed 📖 Manual Coverage Systems Covered Engine Systems: Covers the complete 347cc liquid-cooled, 2-stroke, reed-valve, parallel-twin engine, including fuel delivery (carburetors, fuel lines, fuel pump), lubrication (pre-mix or oil injection system details), cooling (radiator, water pump, coolant flow), combustion (spark plugs, ignition timing, compression testing), and exhaust systems. Transmission Drivetrain Systems: Details the 6-speed sequential manual transmission, clutch operation (cable adjustment, friction plates), gearbox disassembly and reassembly, drive chain maintenance, and rear axle/hub assembly. Chassis Suspension Steering: Includes procedures for front and rear suspension adjustments, fork seal replacement, shock absorber servicing, steering linkage inspection and adjustment, wheel bearing replacement, and tire specifications. Electrical Systems: Provides comprehensive wiring diagrams, troubleshooting guides for lighting, ignition, battery, starter, and other electrical components. Covers rectifier/regulator function and CDI unit diagnosis. Procedures Included Maintenance Procedures: Includes routine maintenance tasks such as air filter cleaning/replacement, spark plug checks, chain lubrication and adjustment, brake fluid checks, and general lubrication points. Diagnostic Troubleshooting: Detailed troubleshooting charts and symptom-based diagnostics for common issues like starting problems, poor performance, overheating, and electrical faults. Repair Rebuild Procedures: Step-by-step instructions for engine disassembly, cylinder head and piston replacement, carburetor rebuilding, transmission overhaul, and suspension component repairs. Installation Adjustment Procedures: Guidance on proper installation of engine components, carburetor synchronization, clutch cable adjustment, and steering alignment. Technical Depth Technical Depth Level: Comprehensive, covering everything from basic maintenance checks to full engine and drivetrain rebuilds. Assumes a certain level of mechanical aptitude and provides detailed technical specifications for precision work. 📊 Manual Specifications File Format Digital Format Quality: N/A (Printed Manual) Print Quality Print Quality Description: Professional quality printing with clear diagrams and legible text, designed for durability in a workshop environment. Binding Type Binding Type: Likely perfect bound or saddle-stitched for durability. Paper Type Paper Type: Durable, perhaps coated paper to resist grease and shop grime. ⚙️ Engine Specifications Primary Engine Engine Type: 2-stroke, Reed Valve, Parallel-Twin Displacement: 347 cc (21.18 cu. in.) Bore X Stroke: 64.0 mm x 54.0 mm (2.52 in x 2.13 in) Compression Ratio: 7.1:1 (typical, may vary slightly by region/revision) Cooling System: Liquid-Cooled Ignition System: CDI (Capacitor Discharge Ignition) Lubrication: Pre-mix or Automatic Oil Injection (check specific model variant) Performance Horsepower Estimate: Approx. 45-50 HP (stock, may vary) Torque Estimate: Approx. 30-35 lb-ft (stock, may vary) Fuel System Carburetor Setup: Dual Mikuni VM26SS (or similar depending on market variation) Fuel Type Recommendation: Unleaded gasoline with octane rating of 87 or higher (recommendation per original manual; often run on higher octane for performance). Fuel Mixture Ratio: 50:1 (Gasoline to 2-stroke oil for pre-mix, if applicable) 🔧 Transmission Standard Transmission Type: 6-Speed Sequential Manual Clutch Type: Wet, Multi-Plate Features Drivetrain: Chain Drive Transmission Fluid Type: Yamalube 10W-30 API SG or similar (check manual for exact specification) Transmission Fluid Capacity: Approx. 1.0 L (1.1 US qt) (verify with manual) 📐 Dimensions Exterior Overall Length: Approx. 70.1 in (1780 mm) Overall Width: Approx. 44.7 in (1135 mm) Overall Height: Approx. 43.1 in (1095 mm) Weights Dry Weight: Approx. 397 lbs (180 kg) Fuel Capacity: Approx. 2.4 gal (9.0 L) Suspension Front Suspension Type: Independent, Double Wishbone, Oil Dampers, Adjustable Preload Front Suspension Travel: Approx. 9.1 in (230 mm) Rear Suspension Type: Swingarm, Monoshock, Adjustable Preload and Rebound Damping Rear Suspension Travel: Approx. 9.5 in (240 mm) Wheels Tires Front Tire Size Oem: AT21x7-10 Rear Tire Size Oem: AT20x11-9 Front Wheel Size: 10 x 5.5 AT Rear Wheel Size: 9 x 8 AT Bolt Pattern: 4-lug (verify specific offset and spacing) 🛡️ Safety Features...