This manual provides comprehensive service and repair information for the 2001 All-Terrain Vehicle (ATV). A respected American manufacturer, is known for its capable and comfortable off-road vehicles, and the line represents a significant part of its heritage. The 400 H.O. model, with its 375cc liquid-cooled, single-cylinder engine and Variable Transmission (PVT), is designed for recreational trail riding and utility tasks, offering a balance of power and reliability. This model features robust engineering, including a MacPherson strut front suspension and independent rear suspension for stability, along with a reliable shaft drive and on-demand all-wheel-drive system. This workshop service repair manual is your essential guide to maintaining and repairing your 2001 ATV. It covers a wide range of systems, including detailed procedures for the engine, fuel system, PVT transmission, drivetrain, suspension, braking, and electrical systems. You will find step-by-step instructions for maintenance tasks such as oil changes and filter replacements, as well as complex repair procedures for engine and transmission overhauls. Troubleshooting guides and detailed wiring diagrams are included to assist in diagnosing and resolving issues, ensuring your ATV remains in optimal working condition. 🏷️ Basic Information Identification Make: Polaris Model: Sportsman 400 H.O. Sub Model: DUSE Year: 2001 Vehicle Type: ATV (All-Terrain Vehicle) Codes Product Name: Polaris Sportsman 400 500 DUSE 2001 H.O. ATV Workshop Service Repair Manual 👋 Introduction Market Position Market Segment: Mid-range recreational and utility ATV, popular for trail riding and light work. Competitive Analysis Competitors: Honda FourTrax, Yamaha Wolverine, Suzuki King Quad, Arctic Cat 400. Key Features Vehicle Key Features: Polaris's long-standing reputation for capable 4x4 systems, comfortable ride, and powerful H.O. (High Output) engine. Key Features Manual Manual Value Proposition: Provides essential knowledge for maintaining and repairing the 2001 Polaris Sportsman 400 H.O. DUSE, ensuring longevity and optimal performance. 📋 Manual Details Coverage Areas Coverage Scope: Comprehensive service and repair for the specified model year and variants. Page Count Estimated Page Count: 300-500 (typical for this era's comprehensive manuals) Manual Type Manual Type: Workshop Service Repair Manual Language Language: English Format Format: Digital Download (likely PDF) 📖 Manual Coverage Systems Covered Engine System: Engine disassembly, assembly, inspection, torque specifications, timing, lubrication, cooling system. Fuel System: Carburetor (likely Mikuni BSR42) overhaul, jetting, fuel pump, fuel lines, fuel tank maintenance. Transmission System: PVT (Polaris Variable Transmission) belt inspection, replacement, clutch service, gearcase maintenance, fluid changes. Drivetrain System: Driveshafts, U-joints, differential, all-wheel drive (AWD) engagement system (if applicable for DUSE variant), wheel bearings. Suspension System: Front and rear suspension components, shock absorbers, A-arms, bushings, wheel alignment. Braking System: Hydraulic brake system, calipers, master cylinders, brake lines, bleeding procedures, pad replacement. Electrical System: Ignition system, charging system (stator, voltage regulator), battery, lighting, starter motor, wiring diagrams, switch gear. Steering System: Handlebar assembly, steering post, tie rods, steering stem bearings. Bodywork And Chassis: Body panel removal and installation, frame inspection, seat, rack systems, graphics. Procedures Included Maintenance Procedures: Oil changes, filter replacements, spark plug service, air filter cleaning/replacement, coolant checks, valve adjustments. Troubleshooting: Diagnostic flowcharts, symptom-based troubleshooting for common issues. Repair Procedures: Step-by-step disassembly and reassembly instructions for all major components. Wiring Diagrams: Detailed electrical system schematics for fault finding. Technical Depth Depth: Comprehensive, covering basic maintenance to complete engine and transmission overhauls. Suitable for professional technicians and experienced DIY mechanics. 📊 Manual Specifications File Format File Format: PDF (Portable Document Format) Print Quality Image Resolution: High-resolution scans for clear text and legible diagrams. Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) Features Searchability: Likely text-searchable PDF for quick access to information. ⚙️ Engine Specifications Primary Engine Engine Type: 4-stroke, SOHC, Single Cylinder Displacement: 375cc (for 400 H.O.) Bore X Stroke: Approx. 84.5 mm x 67 mm (typical for this engine family) Cooling System: Liquid-cooled Ignition: CDI (Capacitor Discharge Ignition) Performance Horsepower: Approx. 28-30 HP (estimated for 400 H.O.) Torque: Not explicitly stated in product description, but typically around 25-30 lb-ft. Fuel System Carburetor Model: Mikuni BSR42 (common for this model) Fuel Type: Unleaded Gasoline Fuel Tank Capacity: Approx. 3.2 US gallons (12.1 L) 🔧 Transmission Standard Transmission Type: Polaris Variable Transmission (PVT) Drive System: Shaft Drive, On-Demand All-Wheel Drive (AWD) Gear Selection: High, Low, Neutral, Reverse, Park Features Clutch Type: Centrifugal Clutch System Gearcase Oil: SAE 80W-90 Hypoid Gear Lubricant (refer to manual for specific Polaris spec) 📐 Dimensions Exterior Length: Approx. 81 inches (2057 mm) Width: Approx. 46 inches (1168 mm) Height: Approx. 47 inches (1194 mm) Wheelbase: Approx. 50.5 inches (1283 mm) Weights Dry Weight: Approx. 590 lbs (268 kg) Ground Clearance: Approx. 10.5 inches (267 mm) Cargo Front Rack Capacity: Approx. 50 lbs (22.7 kg) Rear Rack Capacity: Approx. 100 lbs (45.4 kg) Towing Towing Capacity: Approx. 1,225 lbs (556 kg) 🛡️ Safety Features Ratings Safety Certification: ATV safety standards for its era. Active Features Braking System: Hydraulic disc brakes front...