Target User:
Polaris Indy 400 (133 SKS) owners and independent repair shops.
Purpose:
To provide comprehensive guidance for maintaining, troubleshooting, and repairing the specified snowmobile model.
Value Proposition:
Offers factory-level technical knowledge at an accessible price, enabling self-sufficiency in repairs.
Alternative Sources:
Dealership service departments, generic repair guides (often less detailed).
Features:
Step-by-step instructions, hundreds of pages, detailed illustrations, troubleshooting guides, searchable PDF.
Customer Service:
Guaranteed quality and customer satisfaction from the vendor (JohnsManuals.com).
Primary Coverage:
1987 Polaris Indy 400 (133 SKS)
Secondary Coverage:
Potentially related Indy models with shared components, though specific coverage is for the 133 SKS variant.
Estimated Pages:
Hundreds (exact count not specified, but described as 'hundreds of pages')
File Size:
Approximately 100MB
Type:
Factory Service Repair Manual / Shop Manual
Delivery Method:
Instant Download via TXT file link to PDF
Engine:
Complete engine disassembly, assembly, tuning, and troubleshooting for the 400cc class engine.
Fuel System:
Carburetor adjustment, cleaning, and overhaul; fuel pump operation and service.
Ignition System:
CDI unit, ignition coil, spark plug service, timing adjustments.
Cooling System:
Liquid-cooled system maintenance, coolant replacement, pump service.
Drivetrain:
Clutch operation (drive and driven), belt inspection and replacement, chain case maintenance, chain adjustment.
Suspension:
Front and rear suspension component inspection, lubrication, shock absorber service, spring adjustment.
Brakes:
Brake system inspection, hydraulic fluid replacement, caliper and master cylinder service.
Electrical System:
Wiring diagrams, lighting system maintenance, starter system service, battery care.
Bodywork And Chassis:
Tunnel inspection, seat removal/installation, plastic body panel maintenance, ski and track inspection.
Steering:
Handlebar and steering post maintenance, tie rod inspection, ski alignment.
Maintenance:
Regular scheduled maintenance, lubrication points, cleaning procedures, pre-ride inspections.
Troubleshooting:
Diagnosis of common and uncommon performance issues, systematic problem-solving guides for various systems.
Repair:
Step-by-step instructions for component removal, repair, and reinstallation for all major systems.
Overhaul:
Complete engine rebuild procedures, transmission component overhauls, clutch rebuilding.
Adjustments:
Carburetor jetting and adjustments, clutch engagement and disengagement settings, chain tension, brake adjustments.
Special Tools:
Identification and usage of specialized tools required for specific repair or maintenance tasks.
Level:
Comprehensive (from basic oil changes to major component overhauls).
Detail Level:
Factory-level detail with 'every nut and bolt' coverage.
Illustrations:
Numerous illustrations and diagrams to aid in understanding procedures.
Searchability:
Searchable PDF functionality for quick access to information.
Printability:
Individual pages can be printed as needed.
Format:
Portable Document Format (PDF)
Quality:
High quality (implied by 'great quality service manual', size suggests detailed scans or original digital formatting)
Text Recognition:
Likely OCR-enabled for search functionality, as described.
Printability Notes:
Designed for home or shop printing of specific sections.
Binding:
N/A (Digital Download)
Paper Type:
N/A (Digital Download)
Engine Type:
Two-stroke, piston-port induction
Displacement:
Approximately 399cc (400cc class)
Cylinders:
Single Cylinder
Cooling System:
Liquid-cooled
Bore X Stroke:
Specifics to be detailed in manual, typically around 72mm x 70mm for this class of engine.
Compression Ratio:
To be specified in manual, likely around 6.5:1 to 7.5:1 for 1980s 2-stroke snowmobiles.
Horsepower:
Estimated 35-45 HP (specific rating in manual).
Torque:
Estimated 30-38 ft-lbs (specific rating in manual).
Carburetor Type:
Single Mikuni VM or similar (specific model in manual).
Fuel Type:
Unleaded gasoline (likely 87-89 octane) mixed with 2-stroke oil.
Oil Mixture:
Specific oil-to-gas ratio (e.g., 40:1 or 50:1) detailed in manual.
Type:
CVT (Continuously Variable Transmission) with Polaris P-85 Drive Clutch and MM90 Driven Clutch (or similar factory designations).
Drive Clutch:
Polaris P-85 (or equivalent for the era).
Driven Clutch:
Polaris MM90 (or equivalent for the era).
Optional Transmissions:
N/A for this model; CVT was standard.
Belt Drive:
Reinforced drive belt, with specifications and replacement intervals in the manual.
Gear Reduction:
Internal gear reduction within the chaincase.
Length:
Specific dimensions to be detailed in manual, typically around 95-105 inches for this class.
Width:
Specific dimensions to be detailed in manual, typically around 35-40 inches.
Height:
Specific dimensions to be detailed in manual, typically around 45-50 inches.
Dry Weight:
Estimated 450-500 lbs (specific weight in manual).
Ski Stance:
Specific ski stance in manual, crucial for handling characteristics.
Cargo Capacity:
Limited, usually small rack or under-seat storage, details in manual.
Safety Standards:
Adherence to then-current snowmobile safety regulations, detailed in manual's safety section.
Throttle Safety:
Self-returning throttle lever, emergency shut-off tether (kill switch).
Braking System:
Hydraulically activated disc brake (or drum, depending on variant – manual will clarify).
Chassis Protection:
Body panels and frame designed for rider protection.
Oil Change:
Not applicable for 2-stroke pre-mix engines; refers to checking oil levels in clutches/chaincase and mixing fuel.
Spark Plugs:
Inspect/replace every 100-200 hours of operation or as specified in the manual.
Drive Belt:
Inspect annually or every 500 miles for wear, damage, and proper tension; replace as needed.
Chaincase Oil:
Change annually or as specified by mileage/hours (specific fluid type and capacity in manual).
Coolant:
Flush and replace every 2 years or as recommended in manual.
Engine Oil:
Specific 2-stroke oil blend and ratio (e.g., API TC-W3 rated, 50:1 or 40:1 ratio) detailed in the manual.
Chaincase Lubricant:
Specific gear oil viscosity (e.g., SAE 80W-90) and capacity detailed in the manual.
Coolant:
Ethylene glycol-based antifreeze, typically a 50/50 mix with distilled water (specifics in manual).
Common Problems:
Carburetor gumming/fouling, drive belt wear, recoil starter issues, exhaust system leaks, potential for overheating if cooling system is neglected.
Troubleshooting Focus:
Manual will provide detailed diagnostic trees for these common issues and more.
Polarishistory:
Polaris Industries, founded in 1954, has a long history in snowmobile manufacturing, known for innovation and performance.
Indy Lineage:
The Indy line has been a cornerstone of Polaris's snowmobile offerings, evolving significantly over the years. The 1987 Indy 400 represented a period of refinement and continued development in the mid-size trail performance segment.
Manufacturing Location:
Polaris snowmobiles were and are primarily manufactured in the United States.
Production Years:
The Indy 400 model was produced across multiple years in the late 1980s and early 1990s, with the 1987 model being a specific iteration.
Industry Awards:
Specific awards for the 1987 Indy 400 model are not readily documented in a general sense, but Polaris snowmobiles of this era were generally well-regarded in trail riding performance and reliability for their time.
Consumer Ratings:
User reviews and ratings from the period would be anecdotal; the manual provides factory-level technical information, not consumer satisfaction metrics.
Certifications:
N/A for manual; vehicle would have met applicable safety certifications for its production year.
