Positioning:
The Harley-Davidson FXSB, introduced in 1980, was a significant model for the brand, representing a departure from traditional styling with its lowered stance and sportier appearance, appealing to a younger demographic. This manual is essential for owners of this specific cruiser model.
Competitors 1980:
Competed with other American and Japanese cruiser motorcycles of the era, offering a distinctive Harley-Davidson character and performance.
Model Features:
Low seat height, distinctive styling, and the iconic Shovelhead engine, known for its torque and character.
Engine:
Shovelhead 80 cubic inch (1340cc) V-twin engine, including carburetor tuning, ignition system, lubrication, cooling, and internal component overhauls.
Transmission:
4-speed manual transmission (often referred to as the '4-speed Ratchet Top' or '4-speed Cruise-o-matic'), clutch assembly, and drive chain.
Fuel System:
Fuel delivery, including Keihin butterfly or Super 'E'/'G' carburetors, fuel lines, and fuel tank maintenance.
Electrical System:
Ignition system (points and condenser or early electronic), charging system (alternator, regulator), lighting, starting system, battery, and wiring diagrams.
Brakes:
Front and rear braking systems, including hydraulic disc brakes, brake calipers, master cylinders, lines, and bleeding procedures.
Suspension:
Front fork (often Showa or similar design) and rear shock absorber/swingarm assembly, including fluid changes and seal replacement.
Frame And Bodywork:
Frame components, fenders, fuel tank, seat, handlebars, and basic body panel adjustments.
Wheels And Tires:
Wheel bearing maintenance, tire replacement, and related components.
Maintenance:
Routine maintenance tasks such as oil changes, filter replacements, spark plug service, chain adjustment, brake inspection, and lubrication schedules.
Troubleshooting:
Diagnostic procedures for common starting, running, ignition, and electrical issues, including symptom-based troubleshooting guides.
Repair:
Step-by-step instructions for component disassembly, repair, reassembly, and adjustment of major mechanical and electrical systems.
Engine Rebuild:
Detailed procedures for engine disassembly, inspection of internal components (pistons, rings, valves, camshafts), cylinder honing, and reassembly with torque specifications.
Transmission Overhaul:
Procedures for transmission disassembly, gear inspection, bearing replacement, and reassembly.
Electrical Diagnostics:
Troubleshooting electrical faults using wiring diagrams, testing components, and identifying common failure points.
Depth:
Comprehensive, suitable for DIY mechanics and professional technicians. Covers from basic adjustments to complete engine and transmission rebuilds.
Engine Type:
Air-cooled, 45-degree V-twin, OHV (Overhead Valve)
Displacement:
80 cubic inches (1339.6 cc)
Bore X Stroke:
3.4375 in x 4.25 in (87.3 mm x 108 mm)
Compression Ratio:
Typically 8.0:1 (varies slightly by sub-model and spec updates)
Horsepower:
Estimated 50-60 HP at 5000-5500 RPM (actual figures varied)
Torque:
Estimated 65-75 ft-lbs at 3500-4000 RPM (actual figures varied)
Carburetor:
Harley-Davidson / Keihin Butterfly (e.g., 38mm) or aftermarket Super 'E'/'G' often installed.
Fuel Type:
Unleaded gasoline, minimum 87 octane.
Oil System:
Dry sump, with oil tank separate from the crankcase.
Oil Type:
Harley-Davidson Genuine V-Twin Oil (or equivalent SAE 20W-50 motorcycle oil).
Ignition System:
Points and Condenser or early electronic ignition systems.
Oil Change Interval:
Typically every 2,500-3,000 miles or 6 months, whichever comes first. (Refer to specific manual for exact interval).
Spark Plug Replacement:
Approximately every 5,000-7,500 miles. (Refer to specific manual for exact interval).
Chain Adjustment:
Check and adjust chain tension every 1,000 miles. Replace chain and sprockets as needed based on wear.
Engine Oil Capacity:
Approximately 3 quarts (2.8 Liters) with filter change. (Refer to specific manual for exact capacity).
Transmission Oil Capacity:
Approximately 1 quart (0.95 Liters). (Refer to specific manual for exact capacity).
Primary Chain Case Oil Capacity:
Approximately 1 pint (0.47 Liters) of Harley-Davidson Primary Chaincase Lubricant (or equivalent). (Refer to specific manual for exact capacity).
Shovelhead Common Issues:
Oil leaks (especially from pushrod tubes and tappet blocks), carburetor tuning challenges, points ignition wear, valve guide wear, and potential for cam bearing failure. Transmission shifting can be clunky and require precise clutch operation.
Brake System Wear:
Wear on brake pads, rotors, and potential for caliper seal leaks over time.
Heritage Notes:
Harley-Davidson, founded in 1903, has a long-standing reputation for producing iconic American motorcycles, characterized by their distinctive styling, V-twin engines, and rider experience.
Shovelhead Era:
The Shovelhead engine, introduced in 1966, evolved through various iterations. The 1980 model represents a late-stage development before the introduction of the Evolution engine (Evo) in 1984. The FXSB was part of the 'Sturgis' family, emphasizing performance and styling.
Production Years:
The FXSB model itself was produced for a limited period, with the Shovelhead engine being phased out for the 1984 model year.
