Positioning:
A crucial resource for owners and technicians of a classic American motorcycle, catering to restoration, maintenance, and repair of the iconic FXS Shovelhead.
Value Proposition:
Provides the essential technical documentation required to maintain and repair the 1979 Harley-Davidson FXS Shovelhead, offering a cost-effective alternative to expensive dealership services or potentially incomplete third-party guides.
Salient Points:
Detailed diagrams, step-by-step repair procedures, comprehensive troubleshooting guides, electrical schematics, and specifications specific to the 1979 FXS Shovelhead.
Engine Systems:
Engine assembly, disassembly, tuning, lubrication, cooling (air-cooled), ignition, starting, fuel delivery (carburetor specifics)
Transmission Drivetrain:
4-speed transmission, primary drive system (clutch, chain), final drive (belt drive specific to FXS)
Chassis Suspension:
Frame, front fork (often leading-axle telescopic), rear shock absorbers, swingarm, bearings
Electrical System:
Wiring diagrams, lighting, battery, charging system (generator/alternator), ignition system components, instruments
Braking System:
Front and rear brake systems (likely disc brakes for the FXS), hydraulic components, master cylinders, calipers
Bodywork Fittings:
Fuel tank, fenders, seat, handlebars, controls, exhaust system
Maintenance Procedures:
Oil changes, filter replacement, chain adjustment, spark plug inspection/replacement, battery maintenance, brake fluid checks
Repair Procedures:
Engine rebuild, transmission overhaul, fork seal replacement, brake caliper rebuild, electrical component replacement
Troubleshooting Diagnostics:
Symptom-based troubleshooting for engine performance, electrical faults, braking issues, starting problems
Depth Of Coverage:
Comprehensive, suitable for professional mechanics and experienced DIY enthusiasts. Covers detailed disassembly, assembly, and adjustment procedures.
Engine Type:
Air-cooled, 45-degree V-twin OHV (Shovelhead design)
Displacement:
74 cubic inches (1200cc) or 80 cubic inches (1340cc) depending on specific FXS variant/options.
Bore X Stroke:
74ci: 3.4375 in. x 4.00 in.; 80ci: 3.50 in. x 4.25 in. (approximate)
Horsepower:
Typically in the 60-70 HP range, depending on tuning and specific engine configuration.
Torque:
Around 70-80 lb-ft, with peak delivery at mid-range RPMs.
Carburetion:
Typically a Keihin Butterfly or Linkert carburetor, with detailed tuning and maintenance procedures in the manual.
Fuel Type:
Unleaded gasoline (minimum 87 octane recommended)
Oil System:
Dry sump lubrication system with a separate oil tank.
Oil Capacity:
Approximately 3-4 quarts (including oil tank).
Transmission Type:
4-speed Constant Mesh Manual Transmission
Optional Transmissions:
N/A for the 1979 FXS
Clutch Type:
Wet multi-plate clutch, hydraulically operated (typical for later Shovelheads).
Primary Drive:
Heavy-duty chain drive within a sealed primary cover.
Final Drive:
Belt drive system, standard on FX models.
Wheelbase:
Approximately 61.5 inches (1562 mm)
Length:
Approximately 92 inches (2337 mm)
Height:
Approximately 45 inches (1143 mm) to top of handlebars
Width:
Approximately 35 inches (889 mm) at handlebars
Dry Weight:
Approximately 575-600 lbs (260-272 kg)
Fuel Capacity:
Approximately 3.5 gallons (13.3 liters)
Safety Standards:
N/A (Motorcycle safety standards were less formalized than automotive during this era; manual focuses on mechanical integrity for safe operation).
Braking System:
Dual disc front brake, single disc rear brake (hydraulic actuation). Manual covers brake system maintenance and repair.
Lighting:
Headlight, taillight, brake light, turn signals. Manual provides wiring diagrams for troubleshooting.
Oil Change Interval:
Typically every 2,000-3,000 miles or 6 months, whichever comes first. Manual will provide precise recommendations.
Transmission Oil Change:
Similar to engine oil intervals, or as specified in the manual.
Primary Chain Tension:
Requires regular adjustment, typically every few thousand miles. Manual details procedure and specs.
Engine Oil Type:
Harley-Davidson recommended 20W50 or 10W40 motorcycle-specific oil. Manual will confirm exact specifications.
Transmission Oil Type:
Harley-Davidson recommended primary lubricant or equivalent heavy-duty gear oil (e.g., 80W-90). Manual will specify.
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid. Manual will provide specific type.
Shovelhead Common Issues:
Oil leaks (especially from primary and engine seals), valve guide wear, potential starter issues, carburetor tuning sensitivity. Manual provides diagnostic and repair steps.
Belt Drive Maintenance:
Belt tension adjustment and inspection for wear. Manual covers proper procedures.
Part Number Reference:
Manual will contain diagrams with part numbers for major components, invaluable for sourcing replacements.
Brand Legacy:
Harley-Davidson, an iconic American motorcycle manufacturer with a rich history dating back to 1903, known for its V-twin engines and distinctive styling.
Fxs Lineage:
The FX designation signifies Harley-Davidson's 'Factory Experimental' line, often featuring custom styling and engine configurations. The FXS Low Rider, introduced in 1977, was a significant model in this line, popularizing a more laid-back riding posture and custom look.
Shovelhead Era:
The Shovelhead engine, produced from 1966 to 1984, was a successor to the Panhead engine and preceded the Evolution (Evo) engine. It's known for its distinct sound and character, and for the 1979 model, it represented a mature iteration of this design.
Production Years Fxs:
1977-1985
Manufacturing Location:
Milwaukee, Wisconsin, USA
Model Recognition:
The FXS Shovelhead is recognized as a highly desirable and iconic American motorcycle, celebrated for its classic styling and powerful V-twin engine. It's a staple in the custom and vintage motorcycle scene.
Editorial Reviews:
Contemporary reviews and modern assessments often praise its raw performance, distinctive character, and custom potential. Its popularity is sustained by a dedicated enthusiast base.
Certification Standards:
N/A (Focus is on factory specifications and mechanical integrity, not external certifications.)
