Category:
Custom Cruiser / Chopper segment of the motorcycle market.
Target Audience:
Harley-Davidson owners, mechanics, and enthusiasts performing maintenance and repairs on the FXSB Shovelhead model.
Competitors Era:
Competed against other American V-twin motorcycles, as well as Japanese and European offerings in the cruiser/custom segment.
Design Philosophy:
Emphasized classic Harley-Davidson styling, the iconic Shovelhead engine, and a rider-focused experience.
Model Distinctiveness:
The FXSB ('Super Glide Sport') variant offered a sportier, more custom-oriented appearance compared to other Big Twin models of the era, often featuring unique paint schemes and styling cues.
Engine:
Complete overhaul, tuning, carburetor, ignition, lubrication, cooling (air-cooled)
Transmission:
4-speed constant mesh, clutch, final drive, primary drive
Chassis:
Frame, suspension (front forks, rear shocks), steering, wheels, tires
Brakes:
Front and rear brake systems, hydraulic components, adjustments
Electrical:
Battery, charging system, ignition system, lighting, starting system, wiring diagrams
Bodywork:
Fuel tank, fenders, seat, handlebars, controls
Maintenance:
Scheduled maintenance, oil changes, filter replacements, tune-ups, lubrication
Troubleshooting:
Diagnostic procedures for common and uncommon issues, symptom-based troubleshooting guides
Repair:
Detailed step-by-step repair instructions for all major components and systems
Rebuilds:
Complete engine and transmission rebuild procedures, including component specifications
Adjustments:
Carburetor tuning, ignition timing, clutch and brake adjustments
Depth:
Comprehensive, covering from basic maintenance to full engine and transmission overhauls. Includes detailed torque specifications, clearances, and diagnostic procedures.
Engine Type:
Air-cooled, 45-degree V-twin OHV (Shovelhead)
Displacement:
73.75 cubic inches (1207 cc)
Bore X Stroke:
3.4375 in x 4.00 in (87.3 mm x 101.6 mm)
Compression Ratio:
Approximately 8.0:1
Horsepower:
Estimated 60-65 HP (at crankshaft, depending on tuning and specific components)
Torque:
Estimated 65-70 lb-ft (at crankshaft, depending on tuning and specific components)
Carburetor:
Keihin butterfly carburetor (e.g., CV type) or potentially a Linkert variant depending on specific market or factory options for 1981.
Fuel Type:
Unleaded gasoline, typically 87-91 octane rating.
Oil System:
Dry sump lubrication system with a remote oil tank.
Oil Capacity:
Approximately 3 quarts (2.8 liters) for engine and oil tank combined.
Ignition System:
Breaker-point ignition system or early electronic ignition systems.
Type:
4-speed constant mesh, foot-shift, hand-clutch.
Options:
N/A for standard FXSB models; typically a 4-speed transmission was standard.
Primary Drive:
Duplex chain, enclosed in a primary chaincase.
Transmission Oil:
Typically Harley-Davidson 4-speed transmission oil or an equivalent SAE 50W gear oil.
Wheelbase:
Approximately 62.5 inches (1588 mm)
Length:
Approximately 89.3 inches (2268 mm)
Seat Height:
Approximately 27.7 inches (704 mm)
Dry Weight:
Approximately 550-570 lbs (250-260 kg)
Gross Vehicle Weight Rating:
Not typically specified as a distinct GVWR for this model, but implied by chassis strength.
Fuel Tank Capacity:
Approximately 3.5 gallons (13.2 liters)
Crash Test Ratings:
Motorcycles of this era were not subject to standardized crash testing in the same manner as automobiles; ratings are not applicable.
Braking System:
Front disc brake, rear drum brake (typically).
Lighting:
Headlight, taillight, brake light, turn signals.
Infotainment System:
N/A. This model predates modern infotainment systems; features are focused on core mechanical and electrical operation.
Driver Assistance Features:
N/A. No electronic driver assistance systems.
Connectivity Options:
N/A. No electronic connectivity features.
Dashboard Features:
Analog speedometer, tachometer (optional), odometer, trip meter, indicator lights (oil pressure, neutral, turn signals, high beam).
Oil Change Interval:
Every 2,000-3,000 miles (or 6 months), whichever comes first, depending on riding conditions. Refer to manual for specific recommendations.
Primary Chain Tensioner Adjustment:
Check and adjust approximately every 1,000-2,000 miles.
Spark Plug Replacement:
Approximately every 5,000-10,000 miles, depending on plug type and condition.
Drive Belt Inspection:
Inspect tension and condition regularly, typically at oil change intervals.
Engine Oil Type:
Harley-Davidson recommends SAE 20W50 motorcycle oil, or equivalent (e.g., Valvoline 20W50, Castrol GTX 20W50). Check manual for exact specifications.
Primary Chaincase Fluid:
Harley-Davidson primary chaincase lubricant or SAE 50W gear oil.
Brake Fluid:
DOT 4 brake fluid (check manual for specific recommendations, especially for master cylinder).
Oil Leaks:
Common on older Shovelheads due to aging seals and gaskets. Manual provides procedures for seal replacement.
Pushrod Tubes:
Leaking pushrod tube seals can be a common issue requiring replacement.
Carburetor Tuning:
Carburetors often require periodic adjustment for optimal performance and starting. Manual details tuning procedures.
Starter Solenoid:
Can sometimes fail, requiring troubleshooting and replacement. Manual covers electrical system diagnostics.
Brand Founding:
Founded in 1903, Harley-Davidson is one of the oldest American motorcycle manufacturers.
Iconic Engines:
Known for its V-twin engine configurations, including the Panhead, Shovelhead, Evolution, and Milwaukee-Eight.
Shovelhead Era:
The Shovelhead engine was produced from 1966 to 1984, succeeding the Panhead and preceding the Evolution engine.
Fxsb Introduction:
The FXSB model was introduced in 1981 as a more stylized and custom-oriented Big Twin.
Manufacturing Location:
United States (Milwaukee, Wisconsin and other Harley-Davidson manufacturing facilities).
Production Years For Fxsb:
1981-1982 (short production run before model updates or discontinuation).
Motorcycle Awards:
The FXSB Shovelhead is recognized for its iconic status within Harley-Davidson's history and its contribution to the custom motorcycle culture of the 1980s.
Owner Satisfaction:
Owner satisfaction is generally high for this era of Harley-Davidson, particularly among enthusiasts who appreciate the classic engineering and riding experience. Maintenance requirements are a key factor in satisfaction.
Emissions Certifications:
Compliance with emissions standards of the early 1980s, as mandated by regulatory bodies at the time of manufacture.
