Positioning:
The 1977 Super Glide FXS was a significant model for Harley-Davidson, representing their cruiser/custom styling with a powerful V-twin engine, competing in a growing market segment.
Competitors:
Competed against other American V-twin motorcycles and customizers, as well as burgeoning Japanese motorcycle offerings in the large displacement segment.
Model Identity:
The FXS model specifically offered a more laid-back, custom riding position with forward controls and often a distinctive tank and fender styling.
Powertrain:
The Shovelhead engine provided the iconic Harley-Davidson rumble and torque, making it a desirable machine for cruising and customization.
Utility:
Essential reference for owners and technicians seeking to maintain, repair, and restore the classic 1977 Harley-Davidson Super Glide FXS.
Engine:
V-twin, air-cooled Shovelhead engine specifications, disassembly, assembly, tuning, and troubleshooting.
Fuel System:
Carburetor (likely Linkert or AMF-era Stromberg), fuel tank, fuel lines, and fuel pump (if applicable) maintenance and adjustment.
Ignition System:
Magneto or battery ignition system, spark plugs, ignition timing, coil, points, and condenser service.
Transmission:
4-speed constant mesh transmission, clutch operation, maintenance, disassembly, and assembly.
Drivetrain:
Primary drive, chain maintenance, rear drive belt or chain inspection and adjustment.
Brakes:
Front and rear brake system service, including hydraulic or mechanical brake components, fluid, and adjustment.
Suspension:
Front fork (likely leading-link or telescopic) and rear shock absorber service, maintenance, and adjustments.
Electrical System:
Wiring diagrams, battery service, charging system (generator/alternator), lighting, starter motor, and switches.
Wheels And Tires:
Wheel bearing service, tire pressure specifications, and tire replacement.
Frame And Bodywork:
Frame inspection, body panel removal and installation, seat, fenders, and fuel tank mounting.
Controls:
Handlebar controls, cables, levers, and foot controls adjustment and service.
Maintenance:
Regular scheduled maintenance, lubrication points, filter replacement, and fluid changes.
Troubleshooting:
Diagnostic procedures for common problems, symptom identification, and corrective actions.
Repair:
Step-by-step repair instructions for all major components and systems.
Disassembly Assembly:
Detailed instructions for taking apart and putting back together all major components.
Tuning Adjustment:
Carburetor tuning, ignition timing adjustments, suspension settings, and clutch adjustment.
Depth:
Full factory-level repair and overhaul procedures, suitable for professional mechanics and experienced DIY enthusiasts.
Engine Type:
Air-cooled, 45-degree V-twin
Displacement:
1200cc (74 cubic inches)
Bore X Stroke:
3.4375 in x 4.00 in (87.31 mm x 101.60 mm) - typical for 74ci Shovelhead
Compression Ratio:
Typically 8.0:1 to 8.5:1 (subject to variant)
Valve Train:
Overhead valve (OHV) with pushrods
Horsepower:
Approximately 60-65 HP (estimated, varies with tuning)
Torque:
Approximately 65-70 lb-ft (estimated, varies with tuning)
Carburetor:
Typically a Linkert M-series or AMF-era carburetor (e.g., Keihin butterfly type or Stromberg dual barrel)
Fuel Type:
Unleaded gasoline (premium recommended)
Oil Capacity:
Approximately 3 quarts (2.8 liters) for engine and transmission combined (common for primary system)
Oil Type:
Specific Harley-Davidson oil or equivalent SAE 20W-50 motorcycle oil
Type:
4-speed, constant mesh, manual transmission
Clutch:
Wet multi-plate clutch
Primary Drive:
Primary chain drive to transmission
Final Drive:
Belt drive or chain drive (depending on specific FXS variant, but FXS commonly had belt drive)
Transmission Fluid:
SAE 50 or 70W gear oil (check manual for precise specification)
Wheelbase:
Approximately 62 inches (1575 mm)
Length:
Approximately 90 inches (2286 mm)
Dry Weight:
Approximately 580-600 lbs (263-272 kg)
Gross Vehicle Weight Rating:
Typically around 950-1000 lbs (431-454 kg)
Oil Change:
Every 2,000-3,000 miles or 6 months (typical for the era, check manual for specifics).
Primary Chain Adjustment:
As needed, typically every 5,000-10,000 miles.
Spark Plug Replacement:
Every 10,000-15,000 miles.
Brake Fluid Flush:
Every 2 years (if hydraulic system).
Engine Oil:
Harley-Davidson 20W-50 or equivalent.
Transmission Oil:
SAE 50 or 70W gear oil.
Brake Fluid:
DOT 3 or DOT 4 (if hydraulic, check manual).
Shovlehead Engine:
Oil leaks (common with age), valve train noise, carburetor tuning quirks, ignition system reliability.
Amf Era Components:
Potential for lower quality control on certain components compared to earlier or later Harley-Davidson eras.
Electrical System:
Aging wiring harnesses, failing voltage regulators, and battery charging issues are common with unrestored examples.
Approach:
Emphasizes regular inspection, lubrication, and timely replacement of wear items for optimal performance and longevity.
Heritage:
Harley-Davidson, founded in 1903, boasts a long and iconic history in American motorcycle manufacturing.
Fx Series:
The FX series, introduced in 1971, represented Harley-Davidson's move towards a 'super-bike' or 'custom' style, diverging from the traditional FL (Electra Glide) and XL (Sportster) lines.
Fxs Super Glide:
The FXS Super Glide was specifically styled as a factory custom, often featuring extended front ends, unique paint schemes, and forward controls, making it a precursor to modern cruiser designs.
Production Period:
The FXS was produced from 1971 through 1977, with the 1977 model being the final iteration of this specific design.
Era Context:
The late 1970s saw Harley-Davidson under AMF ownership, a period often marked by manufacturing challenges but also continued development of iconic models like the FXS.
