Vehicle Segment:
Sport ATV
Target Audience:
Recreational riders, trail enthusiasts, sporting competitors
Key Competitors:
Yamaha Warrior, Suzuki Quadsport, Kawasaki Mojave (during the period)
Performance Orientation:
Designed for agility, speed, and maneuverability on varied terrain
Manual Value Proposition:
Provides in-depth technical guidance for owners and mechanics to maintain and repair the Sport 400 efficiently and effectively.
Engine Service:
Engine overhaul, cylinder head, piston, crankshaft, connecting rods, lubrication system, cooling system, intake and exhaust systems
Transmission Service:
Gearbox, clutch, drive shafts, differential, lubrication
Chassis Suspension Steering:
Front and rear suspension, shock absorbers, steering linkage, steering column, hub carriers
Braking System:
Hydraulic system, brake calipers, brake discs, brake pads, master cylinder, bleeding procedures
Electrical System:
Ignition system, charging system, starting system, lighting, wiring diagrams, fuses, relays, battery
Fuel System:
Carburetor service and adjustment, fuel pump, fuel lines, fuel tank
Body Frame Bodywork:
Frame inspection and repair, body panels, fenders, seat, handlebars, controls
Maintenance Procedures:
Oil changes, filter replacements, spark plug service, chain adjustment, brake adjustments, lubrication points
Troubleshooting Guide:
Diagnostic charts, symptom-based troubleshooting for engine, electrical, and mechanical issues
Repair Procedures:
Step-by-step instructions for component removal, disassembly, repair, and reassembly
Component Disassembly Reassembly:
Detailed guides for all major components
Torque Specifications:
Essential torque values for critical fasteners across all systems
Diagnostic Capabilities:
Comprehensive diagnostics for engine performance, electrical faults, and mechanical binding
Rebuild Procedures:
Full engine and transmission rebuild instructions
Adjustment Procedures:
Carburetor tuning, ignition timing, brake adjustments, suspension setup
Engine Type:
Two-stroke, liquid-cooled
Engine Displacement:
377cc
Bore X Stroke:
64.0 mm x 58.0 mm
Carburetion:
Mikuni VM34SS
Ignition System:
CDI (Capacitor Discharge Ignition)
Horsepower Approximate:
Approximately 33-35 HP (Estimate based on similar engines of the era)
Torque Approximate:
Not explicitly stated, but sufficient for its class.
Fuel Type:
Unleaded gasoline (typically 87 octane)
Fuel Mixture:
Pre-mix or Oil Injection System (check manual for specifics)
Fuel Tank Capacity:
4.5 US gallons (approximate)
Length:
Approximately 71.5 inches (1816 mm)
Width:
Approximately 46.0 inches (1168 mm)
Height:
Approximately 44.5 inches (1130 mm)
Dry Weight:
Approximately 400 lbs (181 kg)
Ground Clearance:
Approximately 5.0 inches (127 mm)
Wheelbase:
Approximately 48.7 inches (1237 mm)
Atv Safety Standards:
Complies with ANSI standards for recreational ATVs.
Braking System Type:
Hydraulic disc brakes, front and rear
Lighting System:
Headlights, taillight, brake light
Handlebar Design:
Ergonomic handlebar with integrated controls for safety and ease of operation.
Engine Oil Change Interval:
Recommended every 20-30 hours of operation or annually (refer to manual for exact specification).
Air Filter Cleaning Interval:
Recommended every 10-20 hours or as needed based on operating conditions.
Spark Plug Replacement:
Refer to manual for specific mileage or hours, typically checked annually.
Engine Oil Type:
SAE 10W-30 or 10W-40 (API SG or higher, refer to manual for precise viscosity and API rating).
Transmission Fluid Type:
Polaris Premium 2-Stroke Oil or equivalent (for oil injection system), or specified gear oil for gearbox.
Coolant Type:
Ethylene Glycol based antifreeze (50/50 mix with distilled water).
Carburetor Fouling:
Common on two-stroke engines; requires periodic cleaning and adjustment.
Clutch Wear:
Can occur with aggressive riding or improper maintenance.
Cooling System Maintenance:
Overheating can occur if coolant levels are low or radiator is clogged.
Polaris Atv Legacy:
Polaris has a long history in snowmobiles and expanded into ATVs, becoming a major player in the off-road vehicle market.
Sport Series Development:
The Sport series represented Polaris's move into more performance-oriented ATV designs.
Manufacturing Location:
Made in the USA (Polaris facilities)
