Vehicle Segment:
Mid-size utility ATV, known for its versatility in work and recreation.
Brand Reputation:
Polaris is a well-established manufacturer in the powersports industry, recognized for robust and capable off-road vehicles.
Competitors:
Primarily competed with models from brands like Can-Am Outlander 400, Yamaha Grizzly 400, and Honda Foreman 400.
Engine Power:
The 'HO' (High Output) designation suggests a focus on enhanced engine performance for its class.
Suspension Type:
Typically featured independent front suspension and a robust rear swingarm or IRS setup depending on trim.
Engine Service:
Complete overhaul, diagnostics, tuning, cylinder head, piston, crankshaft, camshaft, valves.
Fuel System:
Carburetor (Mikuni BSR42) troubleshooting and adjustment, fuel pump, fuel lines, fuel tank maintenance.
Cooling System:
Radiator, fan, thermostat, hoses, coolant specifications, bleeding procedures.
Drivetrain Transmission:
PVT (Polaris Variable Transmission) system, clutches (primary and secondary), drive belt inspection and replacement, gearbox overhaul, differential maintenance.
Suspension:
Front and rear suspension components, shock absorbers, A-arms, bushings, adjustment procedures.
Brakes:
Hydraulic brake system diagnostics, caliper service, brake pad replacement, rotor inspection, bleeding procedures, parking brake.
Electrical System:
Ignition system, charging system (stator, regulator/rectifier), starter motor, battery maintenance, lighting, wiring diagrams, diagnostic codes.
Steering:
Steering mechanism, tie rods, ball joints, EPS (Electronic Power Steering) system (if applicable to specific sub-models), wheel alignment.
Chassis Frame:
Frame inspection, welding points, component mounting, body panel removal and installation.
Bodywork Trim:
Fender removal, seat installation, racks, storage compartment access.
Routine Maintenance:
Oil changes, filter replacements, lubrication points, chain adjustment (if applicable), spark plug service, air filter cleaning/replacement.
Troubleshooting:
Systematic diagnostics for common and uncommon problems, fault code interpretation.
Disassembly Reassembly:
Step-by-step instructions for component removal and installation, torque specifications for critical fasteners.
Engine Rebuild:
Complete engine disassembly, inspection of internal components, machining specifications, reassembly procedures.
Transmission Repair:
PVT system servicing, clutch tuning, gearbox internal repairs.
Electrical Diagnostics:
Wiring diagram interpretation, testing of electrical components, charging system analysis.
Suspension Adjustment:
Preload adjustments, dampening settings, alignment procedures.
Diagnostic Capabilities:
Detailed diagnostic charts, troubleshooting trees, and symptom-based fault finding.
Component Specification:
Includes critical torque values, clearances, and specifications for all major components.
Wiring Diagrams:
Comprehensive, high-resolution electrical wiring diagrams for all circuits.
Special Tools:
Lists and descriptions of specialized tools required for specific repair procedures.
Engine Type:
Four-stroke, SOHC, liquid-cooled Single-cylinder
Bore X Stroke:
83 mm x 69 mm (typical for this engine family)
Compression Ratio:
9.7:1 (typical)
Ignition:
Electronic Ignition
Horsepower:
Approx. 26-30 HP (estimated, varies with specific tuning and atmospheric conditions)
Torque:
Not explicitly specified in product info, but designed for low-end grunt suitable for utility tasks.
Fuel Delivery:
Carburetor (Mikuni BSR42)
Fuel Type:
Unleaded gasoline, 87 octane minimum.
Oil Type:
SAE 10W-40, API SG or higher, or Polaris Premium 4 Synthetic 0W-40.
Oil Capacity:
2.0 quarts (1.9 L) with filter change (refer to manual for exact capacity).
Transmission Type:
Automatic Polaris Variable Transmission (PVT) with Engine Braking
Drive System:
Shaft Drive
Gear Selection:
High, Low, Neutral, Reverse, Park
Optional Drive Modes:
On-Demand AWD (All-Wheel Drive) activated by front differential lock.
Clutch System:
Dual clutch system (Primary and Secondary) for variable gear ratio.
Transmission Fluid:
SAE 10W-40, API SG or higher, or Polaris Premium 4 Synthetic 0W-40 (for PVT system).
Length:
Approx. 81 inches (205.7 cm)
Width:
Approx. 46 inches (116.8 cm)
Height:
Approx. 48 inches (121.9 cm)
Wheelbase:
Approx. 50.5 inches (128.3 cm)
Ground Clearance:
Approx. 11.5 inches (29.2 cm)
Dry Weight:
Approx. 600 lbs (272 kg)
Gvw:
Not explicitly specified in product info, but typically around 1000-1100 lbs.
Front Rack Capacity:
200 lbs (90.7 kg)
Rear Rack Capacity:
400 lbs (181.4 kg)
Towing Capacity:
1050 lbs (476 kg)
Front Tire Size:
25 x 8-12
Rear Tire Size:
25 x 10-12
Wheel Type:
Steel or Aluminum wheels (depending on trim/options)
Bolt Pattern:
4 x 110 mm (typical for Polaris ATVs of this era)
Initial Break In:
First service typically at 10-20 hours or 1 month, including oil change and inspection.
Engine Oil Change:
Every 100 hours or 6 months, whichever comes first.
Air Filter Service:
Inspect every 25 hours, clean/replace every 50 hours or as needed in dusty conditions.
Spark Plug Replacement:
Recommended every 100 hours or annually.
Drive Belt Inspection:
Inspect every 100 hours, replace as needed based on wear.
Engine Oil Specification:
SAE 10W-40, API SG or higher; Polaris Premium 4 Synthetic 0W-40 recommended.
Coolant Type:
Ethylene glycol-based antifreeze (50/50 mix with distilled water).
Brake Fluid:
DOT 3 or DOT 4 brake fluid.
Common Wear Items:
Drive belts, tie rod ends, ball joints, wheel bearings, and suspension bushings are common wear items on ATVs of this age and type.
Electrical Connections:
Corrosion on electrical connectors, especially in off-road environments, can lead to intermittent electrical issues.
Carburetor Cleaning:
The Mikuni BSR42 carburetor may require periodic cleaning and adjustment due to fuel quality or debris.
Polarishistory:
Polaris Industries Inc. was founded in 1954 and has a long history in manufacturing snowmobiles, ATVs, and other powersports vehicles.
Sportsman Lineage:
The Sportsman line has been a cornerstone of Polaris's ATV offerings, known for its comfort, utility, and off-road capability. The 400 HO model represents a mid-range option focused on value and performance.
Engine Development:
The 400 HO engine is a derivative of Polaris's established single-cylinder engine designs, refined for improved power delivery.
Manufacturing Location:
Primarily manufactured in the United States.
