Positioning:
The Polaris Sportsman 300 and 400 HO were positioned as capable, mid-size utility ATVs, offering a balance of performance, versatility, and value for recreational trail riding and light-duty work.
Competitors:
Competed directly with models from Honda (e.g., Rancher 350/400), Yamaha (e.g., Kodiak 400), Kawasaki (e.g., Prairie 360/400), and Suzuki (e.g., KingQuad 300/400).
Features:
Independent rear suspension (IRS) on many models for improved ride comfort and handling, selectable 2WD/4WD, reliable engines, durable chassis, Polaris Pro-Trak suspension.
Engine:
Top end (cylinder, piston, valves), Lower end (crankshaft, connecting rod, bearings), Fuel system (carburetor, fuel pump), Cooling system (radiator, fan, coolant).
Drivetrain:
Clutch/Drive belt system (primary and secondary clutches, belt inspection and replacement), PVT (Polaris Variable Transmission) system, Final drive (gearbox, driveshafts, differentials).
Chassis And Suspension:
Frame, suspension components (shocks, A-arms, bushings), steering system (tie rods, steering post), braking system (hydraulic lines, calipers, master cylinders), wheels, tires.
Electrical:
Ignition system, lighting system (headlights, taillights, brake lights), charging system (stator, voltage regulator), starter motor, battery, wiring diagrams, instrumentation.
Maintenance:
Scheduled maintenance (oil changes, filter replacements, spark plug checks), lubrication points, tune-up procedures, valve adjustments.
Troubleshooting:
Diagnostic procedures for common issues, troubleshooting charts based on symptoms (e.g., engine not starting, poor performance, electrical faults).
Repair And Rebuild:
Detailed disassembly and reassembly instructions for major components including engine rebuild, transmission overhaul, suspension repair, electrical system diagnostics and repair.
Specifications:
Torque specifications for fasteners, fluid capacities, critical measurements, clearances, and adjustment procedures.
Depth:
Comprehensive, covering from basic maintenance and troubleshooting to in-depth engine and transmission overhaul, electrical system diagnostics, and chassis component repair. Suitable for both DIY enthusiasts and professional technicians.
Format:
PDF (Portable Document Format)
Quality:
High-resolution scans of original factory service manual pages, ensuring clarity of text, diagrams, and illustrations. Generally considered 'printable quality'.
Binding:
N/A (Digital PDF Download)
Paper:
N/A (Digital PDF Download)
Type 300:
4-stroke, SOHC, Single-cylinder
Displacement 300:
271 cc (Approximate)
Type 400 Ho:
4-stroke, SOHC, Single-cylinder
Displacement 400 Ho:
375 cc (Approximate) 'HO' denotes High Output
Horsepower 400 Ho:
Typically around 20-25 HP (actual figures may vary slightly based on specific tuning and measurement).
Torque 400 Ho:
Not explicitly specified in product information, but designed for utility torque delivery.
Fuel Delivery:
Carbureted (likely Mikuni or Keihin models common for this era)
Fuel Type:
Unleaded gasoline (minimum 87 octane recommended)
Cooling Method:
Liquid-cooled
Type:
Polaris Variable Transmission (PVT) - Automatic CVT
Drive Modes:
H (High), L (Low), N (Neutral), R (Reverse), P (Park)
Availability:
Not applicable for this model year/platform, PVT was standard.
Engine Braking:
Integral engine braking through the CVT system.
Drive System:
Shaft drive, with selectable 2WD/4WD and typically a front differential lock.
Length:
Approx. 83 in. (210.8 cm) - varies slightly between 300 and 400 HO
Width:
Approx. 46 in. (116.8 cm)
Height:
Approx. 48 in. (121.9 cm)
Front Rack:
Approx. 90 lbs (40.8 kg)
Rear Rack:
Approx. 180 lbs (81.6 kg)
Dry Weight:
Approx. 570 lbs (258.5 kg) - varies slightly between models.
Towing Capacity:
Approx. 660 lbs (299.4 kg)
Ground Clearance:
Approx. 11.25 in. (28.6 cm)
Crash Testing:
ATVs are not subject to traditional automotive crash testing standards (e.g., NHTSA). Safety is primarily through design and operator responsibility.
Braking System:
Hydraulic disc brakes (front and rear), typically dual front discs and single rear disc.
4Wd System:
On-demand, 4WD system for enhanced traction.
Lighting:
Dual headlights, brake light, taillight for visibility.
Operator Training:
Emphasis on owner's manual for safe operation, protective gear recommendations.
Features:
Basic instrumentation: speedometer, odometer, trip meter, fuel gauge, gear indicator, 4WD indicator. No advanced infotainment systems like in modern vehicles.
Features:
No electronic driver assistance systems (e.g., ABS, traction control, stability control) found on this model. Primary assistance is the selectable 4WD system.
Features:
N/A (No integrated Bluetooth, USB ports, or smartphone connectivity).
Oil Change:
Every 100 hours or 12 months, whichever comes first (engine oil and filter).
Spark Plug:
Inspect every 6 months or 50 hours, replace as needed. Specific gap provided in manual.
Air Filter:
Clean every 50 hours or 6 months, replace as needed, especially in dusty conditions.
Drive Belt:
Inspect every 50 hours or 6 months for wear, cracks, or fraying. Replace as recommended or if damaged.
Engine Oil:
SAE 5W-50, API SG or higher. Capacity approx. 1.7 US quarts (1.6 Liters) - always verify with manual.
Gearcase Oil:
Polaris AGL Synthetic Gearcase Lubricant (or equivalent SAE 75W-90 GL-4) for rear gearcase. Front differential oil specification also provided.
Coolant:
Ethylene glycol-based antifreeze with corrosion inhibitors. 50/50 mix with distilled water. Capacity approx. 5.5 US quarts (5.2 Liters).
Common Wear Items:
Drive belts, wheel bearings, tie rod ends, bushings, ball joints, and CV boots are common wear items on ATVs of this age and type due to operating conditions.
Electrical Connections:
Corrosion or loose connections at grounds, battery terminals, and connectors can lead to intermittent electrical issues. Regular inspection and dielectric grease are recommended.
Carburetor Maintenance:
Carburetors can require cleaning and adjustment due to fuel quality or debris ingress, especially if the ATV sits for extended periods.
Heritage:
Polaris Industries is a long-standing American manufacturer known for snowmobiles, ATVs, and off-road vehicles, with a reputation for innovation and durability.
Evolution:
The Sportsman line is Polaris's flagship ATV offering, known for its comfort, capability, and versatility. The 300 and 400 HO models represent mid-range iterations of this successful platform, offering a balance of power and affordability compared to larger displacement models.
Manufacturing Location:
Primarily manufactured by Polaris Industries in the USA.
Sales Data:
Sales figures for specific model years are proprietary, but the Sportsman line has historically been a strong seller in the ATV market.
Industry Awards:
While specific awards for the 2008 300/400 HO are not readily available, the Polaris Sportsman line has consistently received positive reviews and industry recognition for its overall performance, comfort, and utility over many years.
Consumer Reviews:
Consumer reviews generally praise the reliability, handling, and utility of the Sportsman series, making it a popular choice in the mid-size ATV segment.
