Segment:
        
        
            Mid-size utility ATV, known for its capable 4x4 system.
        
     
    
    
        
            Competitors:
        
        
            Competed with other utility ATVs from brands like Yamaha (Grizzly), Honda (FourTrax), and Suzuki (King Quad) in its era.
        
     
    
    
        
            Features Highlight:
        
        
            Polaris's 400 4x4 was a significant player in the burgeoning ATV market, offering a reliable 4-wheel drive system and robust performance for its class.
        
     
    
        
            Manual Value Proposition:
        
        
            Provides essential technical information for owners and technicians to maintain and repair the Polaris 400 4x4, ensuring longevity and optimal performance.
        
     
 
    
    
    
        
            Engine Overhaul:
        
        
            Complete engine disassembly, inspection, repair, and reassembly procedures for the 2-stroke engine.
        
     
    
        
            Fuel System:
        
        
            Carburetor tuning, cleaning, and rebuilding; fuel pump and lines inspection and replacement.
        
     
    
        
            Cooling System:
        
        
            Radiator, fan, hoses, and thermostat inspection and replacement.
        
     
    
        
            Transmission And Drivetrain:
        
        
            Detailed procedures for the Polaris Variable Transmission (PVT), gearcases, drive shafts, and final drive components.
        
     
    
        
            Suspension:
        
        
            Front and rear suspension component inspection, adjustment, and replacement (shocks, A-arms, bushings).
        
     
    
        
            Brakes:
        
        
            Hydraulic brake system service, including master cylinders, calipers, brake pads, rotors, and fluid bleeding.
        
     
    
        
            Electrical System:
        
        
            Wiring diagrams, component testing (starter, alternator/stator, ignition, lighting), battery maintenance, and troubleshooting.
        
     
    
        
            Steering:
        
        
            Steering column, tie rods, and linkage inspection and replacement.
        
     
    
        
            Bodywork And Chassis:
        
        
            Frame inspection, plastic body panel removal and installation, seat, and rack components.
        
     
    
    
        
            Preventative Maintenance:
        
        
            Recommended service intervals for fluid changes, filter replacements, lubrication, and general inspections.
        
     
    
        
            Troubleshooting Guides:
        
        
            Systematic diagnostic charts and common problem identification for various issues.
        
     
    
        
            Component Replacement:
        
        
            Step-by-step instructions for replacing major and minor components.
        
     
    
        
            Adjustments:
        
        
            Carburetor idle speed, throttle cable, brake cables, and clutch adjustments.
        
     
    
        
            Torque Specifications:
        
        
            Crucial torque values for engine, drivetrain, suspension, and chassis fasteners.
        
     
    
    
        
            Depth Of Coverage:
        
        
            Comprehensive, covering routine maintenance to complete engine and transmission rebuilds.
        
     
    
        
            Diagnostic Capabilities:
        
        
            Advanced diagnostic procedures and troubleshooting for electrical and mechanical systems.
        
     
 
    
    
    
        
            Engine Type:
        
        
            2-stroke, single-cylinder
        
     
    
        
            Displacement:
        
        
            375 cc (approximate, specific model variant might have slight variations)
        
     
    
        
            Bore X Stroke:
        
        
            Technical specification will be detailed in the manual.
        
     
    
        
            Cooling System:
        
        
            Liquid-cooled
        
     
    
        
            Ignition System:
        
        
            CDI (Capacitor Discharge Ignition)
        
     
    
    
        
            Horsepower:
        
        
            Approximately 26-30 hp (specific figure dependent on exact tuning and model year).
        
     
    
        
            Torque:
        
        
            Technical specification will be detailed in the manual.
        
     
    
    
        
            Carburetor Type:
        
        
            Mikuni VM34 or similar (specific model dependent, detailed in manual).
        
     
    
        
            Fuel Type:
        
        
            Unleaded gasoline
        
     
    
    
        
            Oil Type:
        
        
            2-stroke oil injection (likely, or pre-mix, manual will specify)
        
     
    
    
        
            Spark Plug Type:
        
        
            NGK BR9ES or equivalent (to be confirmed in manual).
        
     
    
        
            Valve Clearance:
        
        
            N/A (2-stroke engine)
        
     
 
    
    
    
        
            Transmission Type:
        
        
            Automatic, Polaris Variable Transmission (PVT) with High/Low range and Reverse.
        
     
    
        
            Drive System:
        
        
            Shaft drive, 4-wheel drive (selectable or full-time 4x4).
        
     
    
    
        
            Optional Transmission:
        
        
            N/A for this model and year.
        
     
    
    
        
            Clutch Type:
        
        
            Centrifugal clutch (part of PVT system).
        
     
    
    
        
            Transmission Fluid Type:
        
        
            Specific ATV/UTV transmission fluid (e.g., Polaris brand or equivalent, manual will specify exact type and viscosity).
        
     
    
    
        
            Fluid Capacity Transmission:
        
        
            Capacity will be detailed in the manual.
        
     
 
    
    
    
        
            Length:
        
        
            Approx. 80-82 inches (specific to model, detailed in manual).
        
     
    
        
            Width:
        
        
            Approx. 42-44 inches (specific to model, detailed in manual).
        
     
    
        
            Height:
        
        
            Approx. 46-48 inches (specific to model, detailed in manual).
        
     
    
        
            Wheelbase:
        
        
            Approx. 50-52 inches (specific to model, detailed in manual).
        
     
    
    
        
            Front Rack Capacity:
        
        
            Typically around 30-50 lbs.
        
     
    
        
            Rear Rack Capacity:
        
        
            Typically around 60-100 lbs.
        
     
    
    
        
            Dry Weight:
        
        
            Approx. 500-550 lbs (specific to model, detailed in manual).
        
     
    
    
        
            Front Tire Size:
        
        
            Commonly 25x8-12 or 25x8-10 (detailed in manual).
        
     
    
        
            Rear Tire Size:
        
        
            Commonly 25x11-10 or 25x12-10 (detailed in manual).
        
     
    
    
        
            Wheel Bolt Pattern:
        
        
            Specific pattern will be detailed in the manual.
        
     
 
    
    
    
        
            Safety Standards:
        
        
            Designed to meet ATV safety standards of its time; no formal crash test ratings like passenger cars.
        
     
    
    
        
            Braking System:
        
        
            Hydraulic disc brakes front and rear.
        
     
    
    
        
            Lighting:
        
        
            Headlights, tail light, and brake light for visibility.
        
     
    
        
            Ignition Safety:
        
        
            Key ignition switch, potential kill switch.
        
     
 
    
    
    
        
            Oil Change Interval Engine:
        
        
            Details for 2-stroke oil injection or pre-mix ratios will be in the manual, typically based on usage hours or mileage.
        
     
    
        
            Air Filter Cleaning:
        
        
            Frequent cleaning and inspection recommended, especially in dusty conditions. Specific intervals in manual.
        
     
    
        
            Spark Plug Replacement:
        
        
            Recommended replacement intervals based on hours or performance, detailed in manual.
        
     
    
        
            Transmission Fluid Change:
        
        
            Annual or based on usage hours, specific interval in manual.
        
     
    
    
        
            Engine Oil Type:
        
        
            Specific 2-stroke oil formulation for oil injection or pre-mix (e.g., API TC, JASO FD rated) – manual will specify.
        
     
    
        
            Coolant Type:
        
        
            Ethylene glycol-based antifreeze (e.g., SAE 15W-40 engine coolant) with appropriate water mix – manual will specify.
        
     
    
        
            Brake Fluid Type:
        
        
            DOT 3 or DOT 4 hydraulic brake fluid (manual will specify exact type).
        
     
    
    
        
            Common Wear Items:
        
        
            Drive belts in PVT system, tie rod ends, bushings, and carburetor jetting can be prone to wear or clogging.
        
     
    
        
            Electrical Issues:
        
        
            Stator failures, rectifier issues, and wiring harness degradation can occur over time.
        
     
    
        
            Engine Issues:
        
        
            Due to its 2-stroke nature, proper fuel/oil mixture and cooling system maintenance are critical to prevent overheating and piston seizure.
        
     
 
    
    
    
        
            Polariss History:
        
        
            Polaris Industries is a long-standing American manufacturer known for its innovation in snowmobiles, ATVs, and other powersports vehicles.
        
     
    
    
        
            Atv Lineup Development:
        
        
            The 400 4x4 was part of Polaris's early and successful expansion into the ATV market, building on its existing engineering expertise.
        
     
    
    
        
            Manufacturing Location:
        
        
            Primarily manufactured in the USA by Polaris Industries.
        
     
    
        
            Production Span:
        
        
            The 400cc class was popular for Polaris throughout the 1990s, with the 400 4x4 being a key model in this segment.