Positioning:
Essential technical resource for owners and mechanics of the 1985-1986 Polaris Indy 400 (133 SKS).
Value Proposition:
Provides factory-level repair and maintenance knowledge, empowering owners to maintain their vintage snowmobile effectively and cost-efficiently.
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.
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.
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.
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.
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
Horsepower:
Approximately 38-45 HP (estimate based on model year and displacement).
Torque:
Not specified in product info.
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 Type:
CVT (Continuously Variable Transmission) with Arctic Drive System (ADS)
Clutch System:
Drive clutch (primary) and Driven clutch (secondary), belt-driven system.
Gear Ratios:
Variable (CVT system does not have fixed gear ratios).
Drive Belt Service:
Manual covers drive belt inspection, replacement, and tension adjustments.
Safety Standards:
Not applicable (vintage snowmobile, no standardized ratings like modern vehicles).
Kill Switch:
Handlebar-mounted kill switch with tether cord is a standard safety feature.
Chassis Protection:
Bodywork and protective shrouds designed to shield rider from moving parts.
Braking System:
Hydraulic disc brake system providing stopping power.
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.
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).
Clutch Wear:
Common for older CVT systems to experience clutch wear, requiring roller, spring, or clutch face replacement.
Carburetor Issues:
Carburetors can become clogged with age and fuel residue, requiring cleaning and rebuilding.
Ignition Coil Failure:
Ignition coils or CDI modules can fail over time, leading to no-spark conditions.
Track Tension:
Improper track tension can lead to premature wear on track, bearings, and suspension components.
Heritage:
Polaris is a long-standing American manufacturer renowned for its snowmobiles, ATVs, and powersports vehicles.
Evolution:
The Indy line was a cornerstone of Polaris's snowmobile offerings, known for performance and reliability. The 400cc engine was a popular mid-range displacement.
Production Period:
1985-1986 for this specific model variant.
