🏷️ Basic Information Identification Make: Polaris Model: Indy 400, Indy 400 SKS, Indy 600, Indy Sport Year: 1987 Product Type: Service/Shop Repair Manual 👋 Introduction Market Position Vehicle Segment: Performance and trail-oriented snowmobiles. Competitive Analysis Key Competitors Era: Arctic Cat, Ski-Doo, Yamaha (models from the late 1980s). Key Features Vehicle Highlights: Known for their reliable Polaris Liberty twin-cylinder engines, agile handling, and capability for both trail riding and sporty performance. Manual Value Proposition: Empowers owners to perform comprehensive maintenance and repairs, saving on professional service costs and extending the lifespan of their vintage snowmobile. 📋 Manual Details Coverage Areas Vehicle Models Covered: Polaris 1987 Indy 400, 1987 Indy 400 SKS, 1987 Indy 600, 1987 Indy Sport Page Count Number Of Pages: 667 Manual Type Type: Factory Service Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Systems: Engine diagnosis, inspection, repair, overhaul, cooling system, lubrication system, fuel system (carburetion, fuel pump), exhaust system, ignition system (CDI, spark plugs). Powertrain Systems: Drive clutch, driven clutch (secondary clutch), chaincase, transmission (gearbox), drive axle, suspension linkage, skis, track assembly, lubrication, alignment, maintenance. Electrical Systems: Wiring diagrams, lighting system, ignition switch, starter system, battery, charging system (stator, voltage regulator), accessory circuits. Chassis And Body: Frame inspection, body panels, seat, handlebars, controls (throttle, brake, choke), windshield, storage compartments, decals. Suspension And Steering: Front suspension (articulated ski, trailing arm), rear suspension (bogey wheel system, torsion springs), shock absorbers, steering mechanism, linkage. Procedures Included Maintenance Procedures: Regular inspections, lubrication points and schedules, track tension adjustment, ski alignment, chaincase oil changes, spark plug replacement, air filter cleaning/replacement, carburetor cleaning and adjustment. Repair Procedures: Engine top-end rebuild (piston, rings, cylinder), crankcase disassembly/reassembly, clutch service (weights, springs, rollers), chaincase overhaul, brake caliper and pad replacement, shock absorber service, carburetor jetting and overhaul, track removal and installation, drive sprocket replacement. Troubleshooting Guides: Systematic diagnosis of common performance issues, starting problems, engine misfires, clutch slippage, braking problems, and electrical faults with detailed symptom-to-cause correlation. Technical Depth Depth Of Coverage: Comprehensive coverage from basic owner maintenance to advanced engine and drivetrain component overhaul. Includes detailed specifications, tolerances, and diagnostic procedures. 📊 Manual Specifications File Format Digital Format: PDF (Portable Document Format) Print Quality Searchability: Searchable text for quick information retrieval. Printability: Printable pages for on-hand reference. Binding Type Binding: N/A (Digital Download) Paper Type Paper Quality: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Liquid-cooled, two-stroke, reed valve, twin-cylinder (Liberty engine family). Model 400 Engine Displacement: Approximately 398cc to 430cc (depending on specific variant). Model 600 Engine Displacement: Approximately 590cc to 600cc (depending on specific variant). Performance Model 400 Horsepower Estimate: Estimated 50-65 HP (varies by specific tune and model). Model 600 Horsepower Estimate: Estimated 75-90 HP (varies by specific tune and model). Fuel System Carburetor Configuration: Dual Mikuni VM or similar constant velocity carburetors (typically 34mm or 36mm). Fuel Type: Unleaded gasoline (Octane rating to be confirmed in manual, typically 87 or 89 octane). Oil Mixing: Autolube oil injection system (or pre-mix as specified). 🔧 Transmission Standard Type: CVT (Continuously Variable Transmission) with Polaris P-85 drive clutch and P-90 driven clutch (or similar Polaris clutch models). Optional Gear Reduction: Integrated into the chaincase with various gear ratios depending on model and intended use. Features Clutch Adjustments: Manual specifies clutch calibration, weight, spring, and ramp adjustments for optimal performance across different conditions. Chaincase Oil: Specific chaincase oil type and viscosity required (e.g., Polaris brand or equivalent ATV/Snowmobile gear oil). 📐 Dimensions Exterior Overall Length: Varies by model, but typical for the era (e.g., 90-100 inches). Overall Width: Varies by model, typically 40-48 inches. Weights Dry Weight: Estimated 400-500 lbs (varies by model and options). Fuel Capacity: Typically 6-10 gallons (depending on model). 🛡️ Safety Features Ratings Crash Test Results: N/A (Snowmobiles of this era did not undergo standardized crash testing like automobiles). Active Features Braking System: Hydraulic disc brake on the drive axle (or similar braking mechanism). Emergency Stop: Kill switch and tether cord (often referred to as a safety lanyard). Passive Features Lighting: Headlight, taillight, brake light for visibility. 💡 Technology Features Infotainment Dash Features: Basic analog gauges including speedometer, tachometer, engine temperature gauge, and indicator lights. Driver Assistance Handling Enhancements: The P-85/P-90 clutch system provides automatic gear ratio adjustment for optimal power delivery and efficiency. Connectivity Accessory Power: Provision for accessory electrical connections (e.g., heated grips, auxiliary lighting) via a fused circuit. 🔧 Maintenance Service Intervals Chaincase Oil Change: Recommended every 1,000-1,500 miles or annually, whichever comes first (refer to manual for precise interval). Spark Plug Replacement: Inspect at 1,000 miles, replace as needed (typically every 2,000-3,000 miles). Clutch Inspection: Inspect drive and driven clutches at 1,000 miles for wear on buttons, rollers, and sheave surfaces. Adjust/service as needed. Fluid Specifications Chaincase Oil Type: Polaris LUBRICANT CHAINCASE OIL or equivalent API GL-4 SAE...