Segment:
Mid-size utility ATV segment, known for its versatility and reliable performance.
Target Audience:
Recreational riders, hunters, farmers, and general utility users.
Key Competitors:
Honda FourTrax, Yamaha Grizzly, Can-Am Outlander, Kawasaki Brute Force.
Vehicle Strengths:
Polaris's signature independent rear suspension (IRS) for a smoother ride, effective AWD system, comfortable seating position, and robust chassis.
Manual Value Proposition:
Provides authoritative, factory-accurate information for maintaining, diagnosing, and repairing the 2010 Polaris Sportsman 300 and 400 HO, saving time and money on repairs.
Engine Systems:
Engine removal/installation, cylinder head, piston, crankshaft, camshaft, valve train, cooling system, lubrication system, fuel system (carburetor for 300, EFI for 400 HO), exhaust system, ignition system.
Transmission Systems:
Automatic transmission (PVT - Polaris Variable Transmission) disassembly/assembly, clutch operation, belt inspection/replacement, gear case maintenance, drive system.
Drivetrain Systems:
All-Wheel Drive (AWD) system, Active Descent Control (ADC), rear differential, front differential, driveshafts, CV joints, wheel bearings.
Chassis And Frame:
Frame inspection, suspension components (front and rear), shocks, A-arms, steering system, wheel alignment, tires, wheels.
Electrical Systems:
Battery, charging system (stator, regulator/rectifier), starting system (starter motor, solenoid), lighting system (headlights, taillights, brake lights), ignition switch, wiring diagrams, sensors, EFI control unit (for 400 HO).
Braking Systems:
Hydraulic disc brakes (front and rear), brake calipers, brake lines, master cylinder, brake pads, brake fluid specifications and bleeding procedures.
Body And Trim:
Body panel removal/installation, fenders, racks, seat, handle grips, controls.
Maintenance Procedures:
Oil changes, filter replacements, spark plug replacement, air filter cleaning/replacement, coolant checks, brake fluid flush, battery maintenance, belt inspection, lubrication points.
Repair Procedures:
Engine overhaul (top-end and bottom-end), transmission repair, differential rebuilds, suspension component replacement, brake system repairs, electrical component diagnostics and replacement, steering system repairs.
Troubleshooting Guides:
Diagnostic flowcharts for common starting, running, and electrical issues. Symptom-based troubleshooting for engine performance problems.
Diagnostic Procedures:
EFI fault code retrieval and interpretation (for 400 HO), ignition timing checks, compression testing, electrical circuit testing with multimeter, fuel pressure testing (where applicable).
Depth Level:
Comprehensive Factory Level
Diagnostic Scope:
Advanced diagnostic procedures, including wiring diagrams for electrical systems and fuel injection troubleshooting.
Rebuild Scope:
Complete engine and transmission rebuild instructions, including torque specifications, clearances, and assembly sequences.
Sportsman 300 Engine Type:
4-stroke, SOHC, Liquid-Cooled Single Cylinder
Sportsman 300 Displacement:
272cc
Sportsman 400 Ho Engine Type:
4-stroke, SOHC, Liquid-Cooled Single Cylinder
Sportsman 400 Ho Displacement:
375cc
Sportsman 300 Horsepower:
Approximately 17-19 HP (estimated)
Sportsman 400 Ho Horsepower:
Approximately 28-30 HP (estimated)
Bore X Stroke 300:
69mm x 73.2mm (estimated)
Bore X Stroke 400 Ho:
84mm x 68mm (estimated)
Sportsman 300 Fuel Delivery:
Carburetor (e.g., Mikuni BSR32)
Sportsman 400 Ho Fuel Delivery:
Electronic Fuel Injection (EFI)
Fuel Type:
Unleaded Gasoline (91 octane recommended)
Fuel Tank Capacity:
3.3 gal (12.5 L)
Type:
Automatic Polaris Variable Transmission (PVT) with Engine Braking
Drive Selection:
High, Low, Neutral, Reverse
Optional Transmission:
N/A (All models for this year use PVT)
Primary Drive:
Shaft Drive
Final Drive:
Sealed O-ring chain
Clutch Type:
High-performance, variable-speed drive clutch and driven clutch
Transmission Fluid Type:
Polaris AGL Synthetic Gearcase Lubricant
Transmission Fluid Capacity:
24 oz (0.7 L) (Gearcase)
Atv Safety Standards:
Adheres to ANSI standards for ATVs.
Active Descent Control:
Available (ADC) - helps control downhill descents.
Engine Braking:
Standard feature of the PVT transmission for controlled deceleration.
Rollover Protection:
N/A (Standard ATV design, rider safety relies on protective gear and responsible operation).
Lighting:
Dual headlights, taillight, and brake light.
Ergonomics:
Handlebar design and controls positioned for rider comfort and control.
Engine Oil Change:
Every 100 hours or 6 months (whichever comes first). Refer to manual for specific conditions.
Air Filter Cleaning:
Every 50 hours or as needed based on operating conditions (e.g., dusty environments).
Spark Plug Replacement:
Every 100 hours or annually.
Transmission Fluid Change:
Every 200 hours or annually.
Brake Fluid Flush:
Every 2 years or as recommended by visual inspection.
Engine Oil Type:
Polaris PS-4 5W-50 Synthetic (or equivalent API SG/SH/SJ/SL rated)
Engine Oil Capacity:
Approx. 2.1 US quarts (2.0 L) with filter change.
Coolant Type:
Ethylene Glycol based antifreeze (50/50 mix with distilled water)
Coolant Capacity:
Approx. 1.5 US quarts (1.4 L)
Common Wear Items:
Drive belts, wheel bearings, ball joints, tie rod ends, brake pads.
400 Ho Efi Considerations:
EFI system requires proper maintenance; potential for clogged injectors or sensor issues if fuel quality is poor.
General Atv Considerations:
Susceptibility to mud ingress affecting bearings and electrical components if not properly maintained or protected.
Polarishistory:
Polaris Industries Inc. is a prominent American manufacturer of recreational vehicles, founded in 1954. Known for innovation in snowmobiles, ATVs, and side-by-sides.
Sportsman Lineage:
The Sportsman line is Polaris's flagship ATV series, consistently updated with new technologies and engine options. The 300 and 400 models represent entry-level to mid-range offerings in the lineup.
Production Years Relevant:
The Polaris Sportsman 400 HO was produced for several years, with the 300 model being a more recent addition in the lineup preceding the 400 HO.
