Vehicle Segment:
        
        
            Entry-level to mid-range All-Terrain Vehicle (ATV).
        
     
    
        
            Target Audience:
        
        
            Recreational riders, utility users, DIY enthusiasts seeking comprehensive repair information.
        
     
    
    
        
            Key Competitors:
        
        
            Honda FourTrax, Yamaha Kodiak, Suzuki KingQuad, Can-Am Outlander (in comparable engine displacements).
        
     
    
    
        
            Manual Utility:
        
        
            Enables owners and mechanics to maintain, diagnose, and repair their Sportsman 400 with factory-correct procedures.
        
     
    
        
            Vehicle Value Proposition:
        
        
            Offers robust performance and versatility for trail riding and light utility tasks at an accessible price point.
        
     
 
    
    
    
        
            Engine Systems:
        
        
            Engine assembly/disassembly, lubrication, cooling, fuel delivery, ignition, exhaust, starting, charging.
        
     
    
        
            Drivetrain Systems:
        
        
            Transmission (PVT - Polaris Variable Transmission), drive clutch, driven clutch, belt replacement, chain drive, differential, axles, CV joints.
        
     
    
        
            Chassis Systems:
        
        
            Frame, suspension (front and rear), steering system, wheel alignment, hubs, bearings.
        
     
    
        
            Braking Systems:
        
        
            Brake caliper overhaul, hydraulic lines, master cylinder, brake fluid specifications, bleeding procedures.
        
     
    
        
            Electrical Systems:
        
        
            Wiring diagrams, battery, lighting, starter motor, charging system (alternator/stator), ignition system components, troubleshooting electrical faults.
        
     
    
        
            Body And Trim:
        
        
            Body panel removal/installation, fenders, racks, seat, storage compartments.
        
     
    
    
        
            Maintenance Procedures:
        
        
            Oil changes, filter replacements, spark plug inspection/replacement, air filter cleaning/replacement, chain adjustment, lubrication points.
        
     
    
        
            Diagnostic Procedures:
        
        
            Troubleshooting guides for common performance issues, starting problems, and system malfunctions.
        
     
    
        
            Repair Procedures:
        
        
            Detailed step-by-step instructions for disassembly, inspection, repair, and reassembly of all major vehicle components.
        
     
    
        
            Installation Procedures:
        
        
            Guidance for installing new parts or rebuilding existing ones.
        
     
    
    
        
            Depth Of Coverage:
        
        
            Comprehensive, covering everything from basic maintenance to complete engine rebuilds and advanced diagnostics.
        
     
 
    
    
    
        
            Engine Type:
        
        
            4-Stroke, Liquid-Cooled, SOHC
        
     
    
    
        
            Bore X Stroke:
        
        
            80mm x 74mm
        
     
    
        
            Compression Ratio:
        
        
            10.0:1 (Typical for this era/engine type)
        
     
    
    
        
            Horsepower Estimate:
        
        
            Approximately 25-28 HP (Actual dyno figures may vary).
        
     
    
        
            Torque Estimate:
        
        
            Approximately 20-22 lb-ft (Actual dyno figures may vary).
        
     
    
    
        
            Fuel Delivery:
        
        
            Carbureted (Likely Mikuni BSR42 or similar).
        
     
    
        
            Fuel Type:
        
        
            Unleaded Gasoline, 87 Octane minimum.
        
     
    
    
        
            Ignition System:
        
        
            Electronic Ignition (CDI).
        
     
    
    
        
            Cooling Method:
        
        
            Liquid-Cooled.
        
     
    
    
        
            Engine Oil Type:
        
        
            SAE 10W-40, API SG or higher (Consult manual for exact specifications).
        
     
    
        
            Engine Oil Capacity:
        
        
            Approx. 2.1 quarts (2.0 Liters) with filter change (Consult manual for exact capacity).
        
     
 
    
    
    
        
            Transmission Type:
        
        
            Polaris Variable Transmission (PVT) with Engine Braking
        
     
    
        
            Drive System:
        
        
            Shaft Drive, On-Demand All-Wheel Drive (AWD).
        
     
    
        
            Gear Selection:
        
        
            High, Low, Neutral, Reverse, Park.
        
     
    
    
        
            Clutch System:
        
        
            Primary and Secondary CVT clutches with belt drive.
        
     
    
    
        
            Transmission Fluid Type:
        
        
            Polaris AGL Synthetic Gearcase Lubricant (or equivalent).
        
     
    
    
        
            Gearcase Fluid Capacity:
        
        
            Approx. 0.47 quarts (0.44 Liters) (Consult manual for exact capacity).
        
     
 
    
    
    
        
            Length:
        
        
            Approx. 81.2 inches (2063 mm).
        
     
    
        
            Width:
        
        
            Approx. 46 inches (1168 mm).
        
     
    
        
            Height:
        
        
            Approx. 47 inches (1194 mm).
        
     
    
        
            Wheelbase:
        
        
            Approx. 50.5 inches (1283 mm).
        
     
    
    
        
            Dry Weight:
        
        
            Approx. 575 lbs (261 kg).
        
     
    
        
            Ground Clearance:
        
        
            Approx. 10.25 inches (260 mm).
        
     
    
    
        
            Front Rack Capacity:
        
        
            75 lbs (34 kg).
        
     
    
        
            Rear Rack Capacity:
        
        
            150 lbs (68 kg).
        
     
    
    
        
            Towing Capacity:
        
        
            1225 lbs (556 kg).
        
     
    
    
    
 
    
    
    
        
            Atv Safety Standards:
        
        
            Compliant with ANSI standards for ATVs.
        
     
    
    
        
            Braking System:
        
        
            Hydraulic Disc Brakes (Front and Rear).
        
     
    
    
        
            Lighting:
        
        
            Dual Halogen Headlights, Tail Light, Brake Light.
        
     
    
        
            Ergonomics:
        
        
            Comfortable seating, intuitive controls, handguards (typical).
        
     
 
    
    
    
        
            Oil Change Interval:
        
        
            Typically every 3 months or 1,500 miles (or 50 hours of operation) – refer to manual for specifics.
        
     
    
        
            Air Filter Cleaning:
        
        
            Inspect frequently, clean or replace as needed based on operating conditions (e.g., dusty environments).
        
     
    
        
            Spark Plug Check:
        
        
            Inspect and gap at first 3 months/500 miles, then every 6 months/1,000 miles (or 100 hours).
        
     
    
        
            Transmission Fluid Change:
        
        
            Typically every 12 months or 3,000 miles (or 200 hours) – refer to manual for specifics.
        
     
    
        
            Drive Belt Inspection:
        
        
            Inspect regularly for wear and damage, replace as per manual recommendations (e.g., at 24 months or 1200 miles).
        
     
    
    
        
            Coolant Type:
        
        
            Ethylene Glycol based antifreeze (50/50 mix with distilled water).
        
     
    
        
            Brake Fluid Type:
        
        
            DOT 3 or DOT 4 Hydraulic Brake Fluid.
        
     
    
    
        
            Common Wear Items:
        
        
            Drive belts, ball joints, tie rod ends, wheel bearings, brake pads, and suspension bushings are common wear items on ATVs of this vintage.
        
     
    
        
            Typical Maintenance Focus:
        
        
            Proper drive belt maintenance and CVT cooling are crucial for longevity. Keeping the air intake and exhaust clean is also important.
        
     
 
    
    
    
        
            Manufacturer Origin:
        
        
            Polaris Industries, founded in 1954, is a leading American manufacturer of powersports vehicles.
        
     
    
    
        
            Sportsman Lineage:
        
        
            The Sportsman line has been a cornerstone of Polaris' ATV offerings, known for comfort, utility, and off-road capability. The 400 model often represented a balance of power and affordability.
        
     
    
    
        
            Production Era:
        
        
            The Sportsman 400 model was produced for several years, with the 2003 model representing a specific iteration within the broader Sportsman family.