Engine Mechanical:
Complete disassembly, overhaul, and reassembly of Shovelhead engine components, including cylinders, pistons, connecting rods, crankshaft, camshafts, and valve train.
Fuel System:
Carburetor (likely Keihin Butterfly or Super E/G) adjustments, rebuilding, and troubleshooting; fuel tank, lines, and petcock service.
Ignition System:
Points and condenser ignition system troubleshooting, timing adjustments, coil and spark plug service.
Electrical System:
Wiring diagrams, battery maintenance, charging system (alternator/generator), lighting, starter system, and accessory wiring.
Drivetrain:
Primary drive (clutch, chain, compensator), transmission (gearbox operation, lubrication, internal components), and final drive (belt or chain, depending on FXB variant).
Suspension:
Front fork service (oil changes, seal replacement, adjustment), steering head bearing maintenance and adjustment, rear shock absorber inspection and replacement.
Braking System:
Front and rear brake caliper service, master cylinder overhaul, brake line replacement, brake fluid flushing, and adjustment.
Chassis And Frame:
Frame inspection, identification of components, and basic adjustments.
Routine Maintenance:
Oil changes, filter replacements, chain lubrication and adjustment, tire pressure checks, brake adjustments, and general inspection points.
Troubleshooting Diagnostics:
Step-by-step guides for diagnosing common running issues, electrical faults, and mechanical problems.
Engine Rebuilds:
Detailed procedures for complete engine teardown, inspection, measurement, part replacement, and reassembly, including piston ring installation, bearing clearances, and gasket replacements.
Transmission Overhaul:
Disassembly and reassembly of the transmission, including gear inspection, shaft replacement, and shifter mechanism adjustments.
Electrical Diagnostics:
Testing of electrical components, circuit tracing using wiring diagrams, and common electrical fault identification.
Suspension Fork Service:
Front fork fluid changes, seal replacement, and fork component disassembly.
Brake System Service:
Brake pad replacement, caliper rebuilding, master cylinder service, and bleeding procedures.
Detail Level:
Comprehensive, from basic maintenance to complete engine and transmission overhauls.
Illustrations:
Hundreds of photos and illustrations to guide repair procedures.
Instructions Format:
Numbered, step-by-step instructions with detailed substeps, notes, cautions, and warnings.
Diagnostics Focus:
Dedicated sections for troubleshooting, especially for the electrical system, combined with wiring diagrams.
Engine Designation:
Shovelhead
Engine Layout:
Air-cooled, V-twin
Displacement:
80 cubic inches (1340cc)
Bore X Stroke:
3.50 in x 4.25 in (88.9 mm x 107.95 mm) - Typical for 80ci Shovelhead
Horsepower Estimate:
Approximately 55-65 HP (estimated, actual may vary based on tuning and model specifics)
Torque Estimate:
Approximately 65-75 lb-ft (estimated, actual may vary based on tuning and model specifics)
Carburetor Type:
Typically Keihin Butterfly or aftermarket options like S&S Super E/G
Fuel Type:
Unleaded gasoline
Oil Type:
Viscosity recommended by Harley-Davidson for the era, likely 20W-50 or 20W-40 motorcycle-specific oil.
Oil Capacity:
Approximately 3 quarts (2.8 liters), including filter.
Engine Oil Change:
Every 2,000-3,000 miles or annually, whichever comes first.
Primary Chain Adjustment:
Every 5,000 miles.
Clutch Adjustment:
As needed, typically during 5,000-mile service.
Spark Plug Replacement:
Every 5,000-10,000 miles, depending on plug type.
Transmission Fluid Change:
Every 10,000 miles or annually.
Engine Oil Viscosity:
20W-50 Motorcycle Specific
Transmission Fluid Type:
Hypoid Gear Oil (e.g., SAE 90 or specified Harley-Davidson equivalent)
Oil Leaks:
Common on Shovelheads due to aging seals and gaskets.
Carburetor Tuning:
Can require frequent adjustment due to varying fuel quality and temperature.
Electrical Conductivity:
Older wiring can degrade, leading to intermittent electrical issues.
Carburetor Float Bowl:
Prone to leaks if the float bowl gasket is aged or the bowl is cracked.
Brand Legacy:
Harley-Davidson, a renowned American motorcycle manufacturer with a rich history dating back to 1903, known for its powerful V-twin engines and iconic cruiser styling.
Shovelhead Era:
The Shovelhead engine, introduced in 1966, replaced the Panhead and continued Harley-Davidson's V-twin tradition. It was known for its distinctive rocker box design and robust construction.
Fx Series:
The FX series, introduced in 1971, offered a blend of the Sportster's sporty styling with the Big Twin's engine. The FXB ('Belt Drive') was a significant evolution, featuring a belt final drive, which was a departure from the chain drive common on most Harleys of the era.
Production Years:
1981 marked a key year for the FXB, with ongoing refinements from earlier FX models.
