Original Market:
Performance cruiser, offering a distinctive styling and robust V-twin engine for the rider seeking a powerful and iconic machine.
Competitors:
Competed against other American V-twin manufacturers and evolving Japanese motorcycle offerings of the era, positioned as a premium, American-made motorcycle.
Design Philosophy:
Emphasized classic V-twin styling, a powerful riding experience, and the customization potential inherent in Harley-Davidson motorcycles.
Vibration Damping:
Early models featured rubber mounting for engine and handlebars to mitigate vibration, a key comfort feature.
Engine:
Disassembly, assembly, inspection, repair, tuning of the Shovelhead engine (including oil pump, ignition, carburetion).
Transmission:
Service and repair of the 4-speed constant mesh transmission, clutch operation, and primary drive.
Electrical System:
Wiring diagrams, charging system (generator/regulator), ignition system (points, coil), lighting, horn, starter.
Chassis:
Frame, forks (leading-link), rear suspension, wheels, bearings, steering head.
Brakes:
Front disc brake system (Girling caliper typical for this era), rear drum brake, brake fluid specifications, and maintenance.
Fuel System:
Carburetor service (likely Linkert or early Keihin models), fuel tank, fuel lines, and fuel petcock.
Bodywork:
Fender service, seat mounting, fuel tank installation, and general sheet metal adjustments.
Maintenance:
Routine service, lubrication, fluid changes, filter replacement, tune-ups.
Troubleshooting:
Diagnostic procedures for common and uncommon problems across all systems.
Repair:
Detailed step-by-step instructions for component removal, overhaul, and reassembly.
Installation:
Guidance on installing new or rebuilt components.
Disassembly:
Comprehensive guides for breaking down all major assemblies.
Assembly:
Detailed instructions for putting components back together correctly.
Depth:
Complete factory-level repair and overhaul procedures suitable for both experienced mechanics and dedicated DIY enthusiasts.
Engine Type:
Air-cooled, 45-degree V-twin, OHV (Overhead Valve)
Engine Family:
Shovelhead
Displacement:
73.75 cubic inches (1208cc)
Bore X Stroke:
3.4375 in x 4.25 in (87.3 mm x 108.0 mm)
Compression Ratio:
Approximately 8.0:1 (typical for the era, can vary slightly)
Horsepower Est:
Approx. 60-65 HP at 5000 RPM (manufacturer specs vary, often understated)
Torque Est:
Approx. 70-75 ft-lbs at 3500 RPM
Carburetor:
Typically a Linkert M74/M75 or early Keihin butterfly carburetor.
Fuel Type:
Unleaded gasoline (early models may have been designed for leaded, but unleaded is compatible and recommended).
Oil System:
Dry Sump with separate oil tank.
Ignition System:
Battery and Coil with mechanical points ignition.
Transmission Type:
4-speed constant mesh, foot shift with heel-toe lever.
Optional Transmission:
N/A for this specific model year and configuration.
Clutch Type:
Wet multi-plate, cable-actuated.
Primary Drive:
Roller chain in an oil bath primary case.
Wheelbase:
Approximately 61.5 inches (1562 mm)
Length:
Approximately 90 inches (2286 mm)
Dry Weight:
Approximately 530 lbs (240 kg)
Gross Vehicle Weight Rating:
N/A (Motorcycle specific)
Safety Ratings:
No formal NHTSA or Euro NCAP ratings for motorcycles of this era. Safety relied on rider skill and basic mechanical systems.
Braking System:
Front disc brake, rear drum brake. Drum brakes were common for rear, front disc became standard on performance models.
Frame Construction:
Steel tube frame designed for stability and rider feedback.
Suspension Design:
Leading-link front forks and dual rear shock absorbers for rider comfort and control.
Oil Change:
Every 1,000-2,000 miles or annually (refer to manual for specific recommendations).
Primary Chain Tension:
Check and adjust every 5,000 miles.
Tune Up:
Recommended every 3,000-6,000 miles, including points adjustment, spark plug replacement, and carburetor tuning.
Engine Oil Type:
Typically SAE 20W-50 or 50W motorcycle-specific oil. Refer to manual for exact viscosity and API classification. (e.g., Harley-Davidson Genuine V-Twin Oil).
Transmission Oil Type:
SAE 90 gear oil or dedicated Harley-Davidson transmission fluid.
Primary Chain Case Oil:
Typically Harley-Davidson primary chain case lubricant or SAE 70W-85W GL-4 gear oil.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid (ensure compatibility with disc brake systems of the era).
Oil Leaks:
Common on older Harley-Davidsons due to aging seals, gaskets, and primitive crankcase sealing.
Points Ignition Tuning:
Requires regular adjustment and can be sensitive to wear. Conversion to electronic ignition is a common upgrade.
Carburetor Tuning:
Linkert carburetors can be finicky and require specific tuning for optimal performance. Early Keihins also need periodic adjustment.
Wheel Bearings And Spokes:
Regular checks for play and spoke tension are crucial for wheel integrity.
Electrical Reliability:
Original charging systems (generator/regulator) can be less reliable than modern alternators. Wiring can degrade over time.
Founding Era:
Founded in 1903, Harley-Davidson is one of the oldest motorcycle manufacturers in the world, synonymous with American motorcycle culture.
Super Glide Introduction:
The Super Glide was introduced in 1971 as Harley-Davidson's first major redesign in years, aiming to bridge the gap between traditional styling and modern performance.
Fxs Design Elements:
The FXS model featured a factory custom look with a bobbed rear fender, low seat, and distinctive styling cues that set it apart from the FL (Electra Glide) and FX (Ranger/Super Glide) models.
Production Period:
The Shovelhead engine was produced from 1966 to 1984. The FXS Super Glide model was produced throughout this period, with variations.
Manufacturing Location:
Milwaukee, Wisconsin, USA.
