🏷️ Basic Information

Make:

Harley-Davidson

Model:

Super Glide FXS

Year:

1977

Model Code:

FXS

👋 Introduction

Positioning:

The 1977 Super Glide FXS represented Harley-Davidson's attempt to offer a more modern, sport-oriented cruiser, evolving from the earlier FX line which blended FL (Electra Glide) and XL (Sportster) components.

Competition:

Competed against other large-displacement cruisers and custom-styled motorcycles of the era, though the American motorcycle market was significantly different with fewer Japanese competitors dominating this segment at this specific time compared to later years.

Features:

Distinctive styling with a 'boat tail' rear fender and often a factory custom paint scheme. Based on the FX chassis, it was an evolution aimed at a more performance-oriented rider than the larger FL models.

Purpose:

Essential for owners and mechanics to maintain, diagnose, and repair the 1977 Harley-Davidson Super Glide FXS.

Value Proposition:

Provides the authoritative factory information needed for any work on this classic motorcycle, ensuring proper procedures and specifications are followed.

📋 Manual Details

Engine:

Yes

Transmission:

Yes

Electrical System:

Yes

Frame And Suspension:

Yes

Brakes:

Yes

Bodywork And Fittings:

Yes

Troubleshooting:

Yes

Estimated Pages:

Over 300

Type:

Factory Service Repair Workshop Manual

Language:

English

Format:

Downloadable PDF

📖 Manual Coverage

Engine Mechanical:

Complete overhaul and component-level repair of the Shovelhead engine.

Carburetion:

Detailed procedures for servicing and tuning the original carburetor (likely a Keihin butterfly or Linkert).

Ignition System:

Coverage of breaker points ignition, coil, spark plugs, and timing adjustments.

Exhaust System:

Installation, repair, and specifications for the exhaust pipes and mufflers.

Transmission Drivetrain:

Service of the 4-speed constant mesh transmission, clutch, and primary drive system.

Electrical Schematics:

Comprehensive wiring diagrams for all electrical components.

Charging System:

Servicing of the alternator and voltage regulator.

Lighting System:

Operation and troubleshooting of headlamp, tail lamp, and turn signals.

Chassis Components:

Disassembly and assembly of front forks, rear shocks, swingarm, and frame.

Wheel And Tire Service:

Information on wheel bearings, spokes, tire mounting, and balancing.

Braking System:

Service and adjustment of front disc brake and rear drum brake (if applicable).

Fuel System:

Tank removal, fuel line maintenance, and petcock operation.

Control Cables:

Adjustment and replacement of throttle, clutch, and brake cables.

Body Panels And Trim:

Removal and installation of fenders, fuel tank, seat, and side covers.

Routine Maintenance:

Oil changes, filter replacements, chain adjustment, lubrication points.

Engine Rebuild:

Detailed steps for cylinder removal, piston replacement, valve servicing, and crankshaft assembly.

Transmission Overhaul:

Gear set replacement, bearing services, and shift mechanism repairs.

Electrical Troubleshooting:

Diagnostic procedures for common electrical faults, short circuits, and open circuits.

Suspension Adjustments:

Fork oil changes, damper adjustments, and rear shock setup.

Brake System Service:

Pad replacement, fluid bleeding, caliper overhaul, and drum shoe adjustment.

Carburetor Tuning:

Jetting adjustments, idle speed setting, and air/fuel mixture calibration.

Ignition Timing Adjustment:

Setting base timing using timing lights or timing marks.

Wheel Bearing Replacement:

Step-by-step guide for replacing wheel bearings.

Clutch Adjustment And Service:

Lever free play adjustment and clutch plate replacement procedures.

Depth:

Comprehensive factory-level repair and overhaul procedures.

Diagnostics:

Detailed troubleshooting charts and symptom-based diagnostic flows.

Specifications:

Inclusion of all critical torque values, clearances, and fluid specifications.

Diagrams:

Exploded views and detailed illustrations of all major components.

📊 Manual Specifications

File Type:

PDF

Searchable Text:

Likely Yes (typical for quality PDF manuals)

Printable:

Yes

Quality:

High-resolution, clear reproductions of original factory documentation.

Binding:

N/A (Digital Download)

Paper:

N/A (Digital Download)

⚙️ Engine Specifications

Engine Type:

Air-cooled, 45-degree V-twin, OHV (Overhead Valve)

Engine Family:

Shovelhead

Displacement:

73.7 cubic inches (1208 cc)

Bore X Stroke:

3.4375 in x 4.25 in (87.3 mm x 108.0 mm)

Compression Ratio:

Approximately 7.5:1 (factory stock)

Horsepower Approx:

Around 60 HP (at the crankshaft, estimated for the era)

Torque Approx:

Around 65-70 lb-ft (at the crankshaft, estimated for the era)

Carburetor Type:

Single Keihin butterfly or Linkert carburetor (depending on specific build variations)

Fuel Type:

Unleaded gasoline (recommended octane rating of 91 or higher)

Oil Type Spec:

Harley-Davidson recommends specific motorcycle oil, often a 20W-50 or similar weight, with ZDDP additive for flat-tappet engines.

Oil Capacity:

Approximately 3 quarts (2.8 liters) for engine oil, including the primary.

🔧 Transmission

Transmission Type:

4-speed, constant mesh, foot shift, hand clutch

Primary Drive:

Duplex chain drive to clutch

Final Drive:

Belt drive

Clutch Type:

Wet, multi-plate

Transmission Fluid Spec:

Harley-Davidson recommends specific transmission oil or a suitable SAE 80W-90 gear oil for this era.

📐 Dimensions

Wheelbase:

Approximately 62 inches (1575 mm)

Length:

Approximately 89 inches (2260 mm)

Dry Weight:

Approximately 570 lbs (259 kg)

Fuel Capacity:

Approximately 5 gallons (19 liters)

Front Tire Size:

3.50-19 (typical)

Rear Tire Size:

4.00-18 or 5.00-16 (typical, depending on wheel configuration)

Wheel Type:

Spoked wheels, commonly with chrome rims.

🛡️ Safety Features

Safety Ratings:

N/A (Motorcycles are not typically assigned NHTSA safety ratings like cars).

Braking:

Front disc brake, rear drum brake. Adequate for the performance of the era, but requires diligent maintenance.

Lighting:

Standard headlamp, tail lamp, brake light, and turn signals. Reflectors are also standard.

Frame Construction:

Steel tube frame providing a rigid chassis for handling.

💡 Technology Features

Infotainment System:

None (This era of motorcycle did not feature infotainment systems).

Driver Assistance Features:

None (Motorcycles of this era do not have driver assistance features).

Connectivity Features:

None (No electronic connectivity features).

Engine Control:

Mechanical controls: points ignition, manual choke, carburetor adjustment.

🔧 Maintenance

Oil Change Interval:

Every 2,500-3,000 miles or annually, whichever comes first (typical for the era, consult manual for exact spec).

Primary Chain Adjustment:

Check and adjust tension every 2,500-3,000 miles or as needed.

Spark Plug Replacement:

Typically every 5,000-10,000 miles, depending on plug type and condition.

Brake Fluid Flush:

Every 1-2 years for hydraulic systems (front brake).

Engine Oil Recommendation:

Refer to manual, but typically Harley-Davidson 20W-50 or equivalent with ZDDP.

Transmission Oil Recommendation:

Refer to manual, but typically SAE 80W-90 gear oil or HD specific.

Brake Fluid Specification:

DOT 3 or DOT 4 brake fluid for the front disc brake.

Carburetion Issues:

Carburetors of this era can be prone to wear, gumming, and tuning instability. Proper cleaning and adjustment are crucial.

Ignition System Reliability:

Breaker point ignition systems require periodic adjustment and can be affected by wear, leading to timing issues.

Primary Drive Chain Wear:

The primary chain and compensator sprocket can experience wear, leading to slack and noise if not properly maintained.

Oil Leaks:

Older Harley-Davidsons, including Shovelheads, are known for minor oil seepage from various gaskets and seals.

Electrical Connections:

Corrosion and looseness in electrical connections can lead to intermittent failures.

📚 Vehicle History

Heritage:

Harley-Davidson, founded in 1903, has a long and storied history of producing iconic American motorcycles known for their V-twin engines and distinctive character.

Evolution Path:

The FXS Super Glide was part of the FX line, which originated in 1971 as a 'hybrid' combining elements of the FL (frame, front end) and XL (engine, transmission) models. The FXS specifically was aimed at a more sporty, custom look and feel, featuring the 'boat tail' fairing and fender treatments that became characteristic of some 1970s Harley models.

Production Period:

The FXS model line was produced through the late 1970s and early 1980s, with variations in styling and components.

Market Era:

The 1970s were a transitional period for Harley-Davidson, facing increased competition and evolving rider preferences. The Super Glide FXS was an important model in this era, showcasing the brand's efforts to adapt.

🏆 Awards & Recognition

Historical Recognitions:

While specific awards for the 1977 FXS might not be documented in the same way as modern vehicles, the model is recognized by enthusiasts and collectors as a significant part of Harley-Davidson's history and the evolution of the cruiser segment.

Owner Satisfaction:

Anecdotal owner satisfaction for this era is often high due to the unique riding experience and classic appeal, despite the maintenance requirements.