1986 Polaris Indy 400 Manual

The 1986 Polaris Indy 400 is a classic snowmobile featuring a 398cc air-cooled twin-cylinder engine, independent front suspension, slide rail rear suspension, and Polaris Variable Ratio (PVR) drive system. This manual covers safety precautions, operation, maintenance, troubleshooting, and specifications for proper use and care of your snowmobile.

Features at a Glance

Key components: 398cc twin-cylinder engine, PVR drive system, independent front suspension, slide rail rear suspension, and comprehensive instrumentation.

Safety Precautions

Always wear proper safety equipment and follow safe operating procedures.

1. Always wear helmet, eye protection, and appropriate clothing
2. Never operate under influence of alcohol or drugs
3. Inspect snowmobile before each use
4. Operate only in safe, designated areas
5. Maintain safe speeds for conditions

WARNING! Snowmobile operation involves inherent risks. Always follow safety guidelines and local regulations.

Operation Instructions

Proper starting and operation procedures for optimal performance.

1. Pre-ride inspection: Check fuel, oil, track, and controls
2. Starting: Set choke, pull starter cord or use electric start
3. Warm-up: Allow engine to warm for 2-3 minutes
4. Operation: Use throttle and brake controls smoothly
5. Shutdown: Allow engine to idle briefly before turning off

CAUTION! Always check throttle and brake operation before riding.

Specifications

• Engine: 398cc air-cooled twin-cylinder
• Bore x Stroke: 72mm x 49mm
• Carburetion: Dual VM34 Mikuni
• Ignition: CDI electronic ignition
• Drive System: Polaris Variable Ratio (PVR)
• Track Length: 116 inches
• Ski Stance: 34 inches
• Fuel Type: Regular unleaded gasoline
• Oil Type: Polaris injection oil or equivalent
• Maximum Speed: Approximately 70 mph

Controls and Instruments

Familiarize yourself with all controls and instruments for safe operation.

Handlebar Controls: Throttle lever, brake lever, emergency stop switch, choke control, light switch.

Instrument Panel: Speedometer, tachometer, fuel gauge, temperature gauge, warning lights. Maintenance: Regular inspection of controls for proper operation and adjustment.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

1. Before each ride: Check fuel, oil, track tension, controls
2. Every 500 miles: Change spark plugs, check carburetor adjustment
3. Every 1000 miles: Change gear case oil, inspect drive belt
4. Seasonal: Grease fittings, check suspension components
5. Annual: Full inspection and service as needed

Tip: Keep detailed maintenance records for reference.

Engine Maintenance

Proper engine care for reliable performance.

1. Spark plugs: Replace every season or 500 miles
2. Carburetor: Clean and adjust annually
3. Compression: Check annually (should be 120-130 psi)
4. Cooling: Keep cooling fins clean and clear
5. Fuel system: Use fresh fuel and proper oil mixture
6. Ignition: Check timing and CDI system annually

WARNING! Always disconnect spark plug wires when working on engine.

Suspension and Track

Maintain suspension and track for optimal handling.

1. Track tension: Adjust to 1-1.5 inches of free play
2. Slide rails: Lubricate with graphite spray
3. Front suspension: Check for worn bushings and leaks
4. Rear suspension: Inspect torsion springs and shocks
5. Skis: Check alignment and wear bars

Storage and Winterization

Proper storage procedures to protect your investment.

End of season: Add fuel stabilizer, run engine to distribute, fog engine, clean thoroughly, store in dry location, elevate track off ground.

CAUTION! Never store with fuel in carburetor bowls - drain completely.

Troubleshooting

Service: Contact authorized Polaris dealer for major repairs

Parts: Use genuine Polaris parts for best performance