Positioning:
A mid-size utility ATV known for its capable all-wheel-drive system and versatile performance for trail riding and moderate work.
Competitors:
Competed against models like the Honda Foreman 500, Yamaha Kodiak 450, and Kawasaki Brute Force 650.
Engine:
400cc High Output (HO) engine, delivering reliable power for its class.
Drivetrain:
On-Demand True All-Wheel Drive (AWD) system for superior traction.
Suspension:
Independent front and rear suspension for a more comfortable and controlled ride.
Storage:
Front and rear racks for cargo hauling.
Value Proposition:
Essential tool for owners to perform maintenance, diagnose issues, and conduct repairs, maximizing the lifespan and performance of their ATV.
Engine:
Engine overhaul, troubleshooting, diagnostics, specifications, tuning
Fuel System:
Fuel pump, carburetor (or EFI depending on exact sub-model), fuel lines, fuel tank, filters
Transmission:
PVT (Polaris Variable Transmission) clutch service, belt inspection/replacement, gearcase maintenance
Drivetrain:
Front and rear drive systems, AWD engagement, CV shafts, differential service
Suspension:
Front and rear suspension components, shocks, A-arms, bushings, ball joints, alignment
Brakes:
Hydraulic brake system, calipers, master cylinders, brake lines, pads, rotors, bleeding procedures
Electrical System:
Ignition system, charging system (stator, regulator/rectifier), battery, starter, lighting, switches, wiring diagrams
Cooling System:
Radiator, coolant hoses, fan operation, thermostat, coolant specifications
Steering:
Steering wheel, steering shaft, tie rods, steering column, bearings
Chassis And Frame:
Frame inspection, component mounting, body panel removal/installation
Bodywork:
Fenders, racks, seat, plastics, decals
Maintenance:
Scheduled maintenance, oil changes, filter replacements, lubrication, adjustments
Troubleshooting:
Diagnostic charts, symptom-based problem solving, common issue identification
Repair:
Detailed step-by-step repair instructions for all major components
Overhaul:
Complete engine and transmission rebuild procedures
Diagnostics:
Electrical system testing, component testing, troubleshooting electrical faults
Assembly Disassembly:
Component removal and reinstallation sequences
Depth:
Comprehensive, covering routine maintenance to complete engine rebuilds and advanced diagnostics
Engine Type:
4-stroke, liquid-cooled, SOHC, single-cylinder
Bore X Stroke:
84.5 mm x 69 mm
Compression Ratio:
10.4:1
Horsepower Estimate:
Approximately 29 HP (varies slightly by source)
Torque Estimate:
Approximately 24 ft-lbs (varies slightly by source)
Fuel Delivery:
Likely Keihin (specific model not stated, but common for Polaris at this time) carburetor (e.g., CVK36) or potentially early EFI on some variants. Manual covers specifics.
Fuel Type:
Unleaded gasoline, 87 octane or higher recommended.
Oil Type:
Polaris PS-4 Full Synthetic 5W-50 (or equivalent with API rating SJ or higher, JASO MA certified)
Oil Capacity:
Approximately 2.0 quarts (1.9 liters) with filter change. Refer to manual for exact capacity.
Ignition System:
Electronic ignition with CDI (Capacitor Discharge Ignition)
Cooling Method:
Liquid-cooled
Type:
Polaris Variable Transmission (PVT) automatic with engine braking
Options:
N/A for this model year; PVT is standard
Drive Modes:
High, Low, Neutral, Reverse, Park
Clutch Type:
Centrifugal clutch (primary) and roller clutch (secondary)
Gearcase Oil Type:
Polaris AGL Synthetic Gearcase Lubricant (or SAE 80W-90 hypoid gear oil)
Gearcase Oil Capacity:
Approximately 0.5 quarts (0.47 liters). Refer to manual for exact capacity.
Atv Safety Standards:
Conforms to ANSI/SVIA standards (where applicable)
Braking System:
Hydraulic disc brakes front and rear, sealed system for durability.
Engine Braking:
Standard on PVT transmission for controlled downhill descents.
Lighting:
Dual 37.5W headlights, 8W taillight/stoplight.
Ergonomics:
Designed for rider comfort and control, with handguards and comfortable seating.
Features:
N/A (basic utility ATV, no infotainment system typically present)
Features:
N/A (basic utility ATV, no driver assistance systems)
Features:
N/A (basic utility ATV, no connectivity features)
AWD System:
Polaris' signature On-Demand True All-Wheel Drive (AWD) system, which automatically engages all four wheels when traction is lost.
Engine Oil Change:
Every 100 hours or 6 months. Refer to manual for severe use conditions.
Air Filter Cleaning:
Clean every 25 hours or 3 months. Replace as needed.
Spark Plug Replacement:
Replace every 2,400 miles or 12 months. Check gap every 1,200 miles or 6 months.
Transmission Oil Change:
Every 200 hours or 12 months.
Brake Fluid Flush:
Recommended every 12 months or as needed.
Valve Adjustment:
Inspect every 1,200 miles or 12 months. Adjust as needed.
Engine Coolant:
Polaris Premium All-Season Coolant or equivalent ethylene glycol based coolant with corrosion inhibitors. Mix 50/50 with distilled water.
Brake Fluid:
DOT 4 brake fluid.
Common Issues:
Potential for belt wear in PVT system under heavy use, occasional carburetor tuning needs (if applicable), and general wear on suspension components over time. The manual provides detailed troubleshooting for these.
Oil Filter Part Number:
Polaris 3083155 or 3089239 (verify with manual)
Air Filter Part Number:
Polaris 3089105 (verify with manual)
Spark Plug Part Number:
NGK CR7E (verify with manual)
Heritage:
Polaris Industries is a long-standing American manufacturer of powersports vehicles, with a strong reputation for innovation and off-road capability.
Evolution:
The Sportsman line has been a cornerstone of Polaris' ATV offerings for decades, with the 400 HO representing a mid-range, popular model known for its value and performance.
Manufacturing Location:
Primarily manufactured in the USA by Polaris Industries.
Production Years:
The 400 HO model has been produced across various years, with 2009 being a specific iteration of this popular displacement.
