Segment:
Cruiser Motorcycle
Target Audience:
Harley-Davidson FXS Low Rider owners and independent repair shops
Competitors 1980:
American V-twin motorcycles from brands like Indian (though less prevalent), and other custom/cruiser style bikes.
Model Identity:
The FXS Low Rider represented Harley-Davidson's evolution towards a more relaxed, custom-oriented riding experience compared to earlier models.
Manual Value Proposition:
Essential resource for maintaining the classic Shovelhead engine and the unique engineering of the FXS model.
Engine Service:
Complete engine disassembly, assembly, tuning, and troubleshooting
Transmission Service:
4-speed gearbox maintenance, repair, and lubrication
Electrical System:
Wiring diagrams, ignition system, lighting, charging system, battery maintenance
Fuel System:
Carburetor (e.g., Keihin butterfly) overhaul, adjustment, and tuning; fuel tank and lines
Suspension System:
Front fork (e.g., telescopic) and rear shock absorber maintenance and adjustment
Brake System:
Front disc and rear drum brake service, fluid replacement, and adjustments
Clutch System:
Clutch operation, adjustment, and component replacement
Chassis And Frame:
Frame inspection, component mounting, and alignment
Bodywork And Trim:
Fenders, fuel tank, seat, and handlebar components
Routine Maintenance:
Oil changes, filter replacements, lubrication points, chain adjustment
Troubleshooting:
Diagnostic procedures for common issues, symptom-based fault finding
Component Overhaul:
Detailed steps for rebuilding engine, transmission, and carburetor
Adjustment Procedures:
Carburetor synchronization, ignition timing, clutch and brake lever free play
Special Tool Requirements:
Identification of specialized tools needed for specific repair tasks
Depth:
Comprehensive from basic maintenance to full engine rebuilds and electrical system diagnostics
Displacement:
73.75 cubic inches (1208 cc)
Bore X Stroke:
3.4375 in x 4.25 in (87.31 mm x 107.95 mm)
Engine Configuration:
Air-cooled, 45-degree V-twin
Valve Train:
Overhead valve (OHV) with pushrods
Horsepower Estimate:
Approximately 60-65 HP (actual figures varied and were often not officially published)
Torque Estimate:
Approximately 70-75 lb-ft (actual figures varied)
Carburetor Type:
Single Keihin butterfly carburetor (e.g., 36mm CV or earlier butterfly models)
Fuel Type:
Unleaded gasoline, octane rating as specified by Harley-Davidson for the era.
Safety Standards:
Compliance with US DOT motorcycle safety standards for the period.
Braking System:
Front disc brake, rear drum brake. ABS was not a feature.
Lighting:
Halogen headlight, taillight, turn signals
Oil Change Interval:
Typically every 2,000-3,000 miles or annually, whichever comes first.
Primary Chain Tension Check:
Every 1,000-2,000 miles.
Spark Plug Replacement:
Every 5,000-10,000 miles, depending on plug type.
Engine Oil Type:
Harley-Davidson 20W50 or equivalent (e.g., Mobil 1 V-Twin 20W50)
Transmission Fluid Type:
Harley-Davidson Formula + or equivalent gear oil (e.g., Spectro 6-Speed Transmission Fluid, even though it's a 4-speed, similar viscosities apply).
Primary Chain Case Oil Type:
Harley-Davidson Formula + or equivalent (shared with transmission for this era).
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid (check manual for specific recommendation).
Fork Oil Type:
Harley-Davidson Suspension Fluid 10W or equivalent fork oil.
Carburetor Tuning:
Shovelheads can be sensitive to altitude and temperature changes, requiring periodic carburetor tuning.
Oil Leaks:
Common for Shovelheads to develop minor oil leaks from seals and gaskets due to age and materials.
Ignition Timing:
Maintaining precise ignition timing is crucial for performance and engine longevity.
Primary Chain Wear:
The primary chain and tensioner can wear, affecting clutch engagement and drivetrain noise.
Manufacturer Origin:
United States
Brand Legacy:
Harley-Davidson, a marque synonymous with American motorcycle culture and performance since 1903.
Fx Series Context:
The FX line, introduced in 1971, offered a blend of the traditional Harley-Davidson V-twin with more modern chassis elements.
Shovelhead Era:
The Shovelhead engine was in production from 1966 to 1984, and the 1980 model represents a mature iteration of this iconic powerplant.
Production Period:
FXS Low Rider produced from 1977 through 1982.
Model Recognition:
While not 'awards' in the modern sense, the FXS Low Rider was a significant model that helped Harley-Davidson maintain its market share and appeal to a younger, more style-conscious rider.
Reliability Perception:
Shovelheads have a reputation for requiring diligent maintenance but are robust when properly cared for. Reliability is highly dependent on prior maintenance history.
Manufacturing Certification:
Manufactured to Harley-Davidson's internal quality and safety standards of the time.
