🏷️ Basic Information Identification Make: Polaris Model: Indy 400 (133 SKS) Model Code: 133 SKS Year: 1985-1986 Codes Chassis Code: Not specified in product info Engine Code: Not specified in product info 👋 Introduction Market Position Positioning: Essential technical resource for owners and mechanics of the 1985-1986 Polaris Indy 400 (133 SKS). Competitive Analysis Value Proposition: Provides factory-level repair and maintenance knowledge, empowering owners to maintain their vintage snowmobile effectively and cost-efficiently. Key Features Feature 1: Comprehensive coverage from routine maintenance to complex overhauls. Feature 2: Detailed step-by-step instructions with clear language. Feature 3: Abundant illustrations and diagrams for visual guidance. Feature 4: Searchable and printable PDF format for user convenience. Feature 5: Expert customer support guarantee. 📋 Manual Details Coverage Areas Vehicle Coverage: Polaris Indy 400 (133 SKS) models from 1985 and 1986. Page Count Page Count: Hundreds of pages (specific count not provided). Manual Type Manual Type: Factory Service & Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Comprehensive engine diagnostics, overhaul, tuning, lubrication, cooling system. Fuel System: Carburetor assembly, fuel delivery, fuel tank maintenance. Ignition System: CDI unit, spark plugs, wiring, timing. Drive System: Primary and secondary clutch service, chain drive maintenance, lubrication. Suspension System: Front and rear suspension component inspection, repair, and adjustment (e.g., shocks, springs, trailing arms). Steering System: Handlebar, steering post, tie rods, and spindle maintenance. Braking System: Brake caliper, disc, and cable service, adjustment, and replacement. Electrical System: Wiring diagrams, lighting, kill switch, starter system (if applicable). Bodywork And Chassis: Tunnel, seat, hood, and bumper repair and replacement. Procedures Included Maintenance: Oil changes, lubrication, chain adjustment, spark plug replacement, general inspection. Troubleshooting: Systematic diagnosis of common and uncommon problems, diagnostic charts. Repair: Detailed step-by-step instructions for component overhaul and replacement (e.g., engine rebuild, transmission swap). Adjustment: Carburetor tuning, clutch alignment, brake adjustment, suspension settings. Technical Depth Depth: Factory-level repair and maintenance procedures suitable for both novice and experienced technicians. Illustrations: Hundreds of illustrations and diagrams to aid in understanding procedures. Searchability: Searchable PDF functionality for quick access to specific topics. Printability: Printable pages for on-hand reference during repairs. 📊 Manual Specifications File Format File Format: PDF Print Quality Print Quality: High-quality digital reproduction of original factory documentation. Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: 2-stroke, Fan-Cooled, Rotary Valve Displacement: 398cc (exact displacement for '133 SKS' may vary slightly by sub-model, but typically around this) Bore X Stroke: Typically around 65.5 mm x 74 mm (specifics to be confirmed in manual). Carburetion: Dual Mikuni VM34 or similar single carb setup (specific model dependent, manual will clarify). Compression Ratio: Not specified in product info, but typically 6.0:1 to 7.0:1 for this era. Cooling System: Fan-cooled Performance Horsepower: Approximately 38-45 HP (estimate based on model year and displacement). Torque: Not specified in product info. Fuel System Fuel Type: Unleaded gasoline (87 octane or higher recommended, consult manual for precise mix/grade). Oil Mixture: Premixed fuel and oil, or Autolube system (manual will specify). 🔧 Transmission Standard Transmission Type: CVT (Continuously Variable Transmission) with Arctic Drive System (ADS) Clutch System: Drive clutch (primary) and Driven clutch (secondary), belt-driven system. Features Gear Ratios: Variable (CVT system does not have fixed gear ratios). Drive Belt Service: Manual covers drive belt inspection, replacement, and tension adjustments. 📐 Dimensions Exterior Track Length: Likely 133 inches for SKS model (specified in product name). Ski Stance: Not specified in product info, but typically around 40-42 inches for this era. Weights Dry Weight: Estimated around 450-500 lbs (specifics not provided). 🛡️ Safety Features Ratings Safety Standards: Not applicable (vintage snowmobile, no standardized ratings like modern vehicles). Active Features Kill Switch: Handlebar-mounted kill switch with tether cord is a standard safety feature. Passive Features Chassis Protection: Bodywork and protective shrouds designed to shield rider from moving parts. Braking System: Hydraulic disc brake system providing stopping power. 💡 Technology Features Infotainment Infotainment System: Not applicable (basic snowmobile technology for its era). Driver Assistance Assistance Features: Not applicable. Basic mechanical controls. Connectivity Connectivity Features: Not applicable. 🔧 Maintenance Service Intervals Chain Case Lube: Recommended at annual service or every 1000 miles, whichever comes first (consult manual for exact interval and lubricant type). Clutch Inspection: Inspect primary and secondary clutches annually or every 500 miles for wear, alignment, and belt condition. Spark Plug Replacement: Recommended annually or based on mileage/usage, check gap and condition regularly. Fluid Specifications Chain Case Oil: Specific SAE 80 or 90 gear oil (consult manual for exact viscosity and API service classification). 2 Stroke Oil: High-quality 2-stroke snowmobile oil, specifically formulated for fan-cooled engines (e.g., Polaris branded or equivalent, consult manual for type and blend ratio). Known Issues Clutch Wear: Common for older CVT systems to experience clutch wear, requiring roller, spring, or...