This manual covers the snowmobile, produced between 1979 and 1980. The Apollo series was a notable part of recreational snowmobile offerings during a competitive era, recognized for its reliability and ease of maintenance. These snowmobiles were designed for trail riding and offered a good power-to-weight ratio for their class, embodying the engineering quality expected. This workshop repair service manual is an essential resource for owners and technicians. It provides comprehensive coverage of all major systems, including the engine, drivetrain, cooling, fuel, and electrical systems, as well as the chassis and suspension. The manual details scheduled maintenance procedures, troubleshooting guides for common issues, step-by-step repair instructions, and critical technical specifications. With clear diagrams and detailed explanations, it facilitates effective maintenance and repair to ensure the continued performance and longevity of the snowmobile. 🏷️ Basic Information Identification Make: Polaris Model: Apollo 340 Year: 1979-1980 Codes Vehicle Type: Snowmobile 👋 Introduction Market Position Historical Context: The Polaris Apollo series represented a significant offering in the recreational snowmobile market of the late 1970s, known for its robust construction and trail-ready capabilities. Competitive Analysis Key Competitors: Arctic Cat, Ski-Doo, Yamaha, and John Deere snowmobiles of the same era. Key Features Vehicle Strengths: Reliability, ease of maintenance, good power-to-weight ratio for its class. Manual Benefit: Essential resource for owners and technicians aiming to preserve the performance and longevity of their vintage Polaris Apollo 340. 📋 Manual Details Coverage Areas Systems Covered: Engine, Drivetrain, Cooling System, Fuel System, Electrical System, Chassis, Suspension, Steering System, Lighting, Bodywork, Interior Components Page Count Estimated Page Count: Approximately 200-300 pages (typical for a workshop manual of this era) Manual Type Manual Type: Workshop Repair Service Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanics: Engine assembly, disassembly, timing, compression testing, cylinder head service, piston and ring replacement, crankshaft and connecting rod service. Drivetrain Components: Clutch (primary and secondary) service, belt inspection and replacement, chain case lubrication and inspection, drive axle assembly. Cooling System: Radiator inspection and cleaning, coolant hose replacement, thermostat testing and replacement. Fuel System: Carburetor inspection, cleaning, and adjustment; fuel pump operation; fuel filter replacement. Electrical System: Ignition system (spark plugs, coil, ignition timing), lighting circuits, gauge functionality, starter motor, and charging system (if applicable). Chassis And Suspension: Track system inspection and adjustment, suspension arm and linkage lubrication and service, shock absorber replacement, steering system component replacement. Procedures Included Maintenance Procedures: Scheduled maintenance, lubrication points and intervals, belt tension adjustment, track tension adjustment, track alignment. Troubleshooting Guides: Diagnostic charts for common starting, running, and performance issues based on symptoms. Repair Procedures: Step-by-step instructions for component removal, installation, and overhaul for all major systems. Technical Specifications: Torque specifications for critical fasteners, gap settings (spark plug, points), engine timing specifications. Technical Depth Diagnostic Capability: Advanced diagnostics including compression testing, leak-down testing, ignition system testing, and fuel system pressure testing. Rebuild Procedures: Detailed instructions for complete engine rebuilds, transmission overhauls, and suspension component rebuilds. 📊 Manual Specifications File Format PDF Quality: High-resolution scans for clear text and diagrams, searchable text where applicable. Print Quality Diagrams And Illustrations: Clear, detailed exploded views, wiring diagrams, and assembly illustrations. Binding Type Binding Type: N/A (Digital PDF Format) Paper Type Paper Type: N/A (Digital PDF Format) ⚙️ Engine Specifications Primary Engine Engine Type: 2-stroke, parallel twin cylinder (typical for Polaris 340cc engines of this era) Displacement: Approximately 340cc Performance Estimated Horsepower: 30-45 HP (Varies based on specific tuning and engine condition) Fuel System Carburetion: Likely twin Mikuni or Keihin carburetors, specific model dependent. Fuel Type: Pre-mixed gasoline and 2-stroke oil (e.g., 40:1 or 50:1 ratio specified in manual) 🔧 Transmission Standard Transmission Type: CVT (Continuously Variable Transmission) with a drive clutch and driven clutch system. Optional Gear Selection: Forward, Neutral, Reverse (typically via a gear selector for the drive system). Features Clutch System: Heavy-duty clutch kits available for enhanced performance and durability, addressing wear and tear on original components. 📐 Dimensions Exterior Track Width: Variable depending on track size and configuration, but typically around 15 inches wide for recreational use. Weights Dry Weight: Estimated around 350-450 lbs (dependent on options and specific configuration). 🛡️ Safety Features Ratings Historical Safety Standards: Snowmobile safety standards of the late 1970s, focusing on rider protection and vehicle stability. Active Features Kill Switch: Essential safety feature for immediate engine shutdown. Passive Features Windshield: Provides protection from wind, snow, and debris. 💡 Technology Features Infotainment Gauge Cluster: Basic instrument cluster including speedometer, tachometer (often optional), and warning lights. Driver Assistance No Electronic Aids: As a 1970s snowmobile, it lacks modern electronic driver assistance systems. Connectivity No Connectivity: No onboard connectivity features. 🔧 Maintenance Service Intervals Clutch Maintenance: Clutch inspection and cleaning every 50-100 operating hours; belt replacement as needed based on wear. Engine Tune Up: Annual or bi-annual tune-up including spark plug replacement, carburetor adjustment, and...