🏷️ Basic Information Identification Make: Harley-Davidson Model: Duo Glide Year: 1960 Product Type: Factory Service Repair Manual 👋 Introduction Market Position Positioning: The 1960 Duo Glide represents a pivotal model in Harley-Davidson's evolution, bridging the gap between earlier rigid frames and more modern designs. This manual targets owners and mechanics seeking to maintain or restore these classic motorcycles. Competitive Analysis Comparison To Contemporaries: Competed with models from British marques like Triumph and BSA, and American counterparts from Indian Motorcycle (though in decline). The Duo Glide offered robust V-twin power and the iconic Harley-Davidson riding experience. Key Features Distinguishing Features: Introduction of the Duo Glide name signified the adoption of hydraulic rear suspension (swingarm), a significant upgrade for ride comfort over previous rigid or sprung-seat models. It also continued the evolution of the Panhead engine. 📋 Manual Details Coverage Areas General Coverage: Repair and adjustment procedures for the 1960 Harley-Davidson Duo Glide. Page Count Estimated Pages: Varies by edition, typically 300-500 pages for comprehensive factory manuals. Manual Type Type: Factory Service Manual Language Language: English Format Format: Likely printed book or digitized PDF (depending on sale context). 📖 Manual Coverage Systems Covered Engine: Full engine disassembly, assembly, repair, and tuning for the Panhead engine. Transmission: Gearbox disassembly, assembly, maintenance, and repair. Frame And Suspension: Front fork (leading link or telescopic depending on exact spec), rear suspension (swingarm), frame integrity, and related components. Brakes: Drum brake systems, including adjustment, relining, and troubleshooting. Electrical System: Ignition system (magneto or distributor), lighting, charging system (generator), and wiring diagrams. Fuel System: Carburetor service and adjustment (e.g., Linkert), fuel tank, and fuel lines. Clutch: Clutch operation, adjustment, and component replacement. Controls: Throttle, clutch, and brake lever controls, as well as foot controls. Bodywork And Trim: Fenders, fuel tank, seat, and other cosmetic components. Procedures Included Maintenance: Routine service checks, lubrication, filter changes, and tune-ups. Disassembly And Assembly: Step-by-step instructions for component removal and reinstallation. Repair: Detailed repair procedures for worn or damaged components. Troubleshooting: Diagnostic charts and symptom-based troubleshooting guides. Adjustment: Precise adjustments for ignition timing, carburetor mixture, clutch, and brakes. Technical Depth Depth: Comprehensive, covering everything from basic maintenance to full engine and transmission overhauls, suitable for professional mechanics and experienced DIY enthusiasts. 📊 Manual Specifications File Format Digital Format Details: If digital (PDF), expect searchable text, high-resolution diagrams, and easy navigation. Print Quality Print Quality Description: Factory manuals typically feature clear, durable paper with high-quality printing for diagrams and text. Binding Type Binding Description: Original factory manuals were often hardbound or spiral-bound for durability in a workshop environment. Paper Type Paper Type Description: Durable, often semi-gloss paper stock designed for repeated use in workshop conditions. ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, 45-degree V-twin, OHV (Overhead Valve) Engine Family: Panhead Displacement: 74 cubic inches (1208 cc) - FL model Bore X Stroke: 3.4375 in x 4.25 in (87.3 mm x 108 mm) (for 74 CI) Compression Ratio: Approximately 7.0:1 (varies slightly by specific variant) Performance Horsepower Estimated: Approx. 50-55 HP at 5,000 RPM (estimated for stock configuration) Torque Estimated: Approx. 70-80 lb-ft at 3,000 RPM (estimated for stock configuration) Fuel System Carburetor: Typically a Linkert M-series carburetor (e.g., M-74B or similar). Fuel Type: Gasoline (typically leaded premium, octane rating suitable for the era). Ignition System Ignition Type: Battery and Coil with Distributor or Magneto (depending on specific variant and region). 🔧 Transmission Standard Transmission Type: 4-speed constant mesh, hand-clutch (left handlebar) and foot-shift (right foot pedal). Features Clutch Type: Dry, multi-plate Gear Ratios Typical: Specific ratios documented in the manual; generally geared for torque and cruising. Fluid Specifications Transmission Fluid Type: Often a specific Harley-Davidson branded gear oil or equivalent SAE 50 or SAE 60 transmission oil. 📐 Dimensions Exterior Wheelbase: Approx. 60.5 inches (1537 mm) Length: Approx. 88.5 inches (2248 mm) Weights Dry Weight: Approx. 515-540 lbs (234-245 kg) depending on exact configuration. Fuel Capacity: Approx. 4.5-5.0 gallons (17-19 liters) 🛡️ Safety Features Ratings Safety Ratings Era: Safety standards and crash testing for motorcycles in 1960 were rudimentary compared to modern standards. Focus was on mechanical reliability and rider control. Active Features Braking System: Dual leading shoe drum brakes front and rear (standard for FL models). Passive Features Frame Design: Steel tube frame, designed for stability. 💡 Technology Features Infotainment Infotainment System: None (basic analog gauges: speedometer, ammeter). Driver Assistance Driver Assistance Features: None. Rider is fully responsible for operation. Connectivity Connectivity Features: None. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 1,000 - 1,500 miles, or more frequently under severe use. Consult manual for specific intervals. Transmission Oil Change: As per manual, often concurrent with engine oil changes or every 2,000-3,000 miles. Spark Plug Replacement: Typically at 5,000 - 10,000 mile intervals, depending on plug type and condition. Ignition Timing Check: Recommended at regular service intervals or if performance issues...