Era Significance:
Represents a pivotal era for Harley-Davidson, transitioning into the AMF era and later management buyouts. The FX models were cruiser/custom oriented.
Competitors:
Competed in the large-displacement V-twin cruiser market, facing competition from Japanese manufacturers expanding into the segment.
Model Characteristics:
Known for its iconic V-twin rumble, custom styling, and a powerful 1340cc engine that defined American motorcycling for decades.
Manual Value:
Essential for maintaining and restoring these classic machines, providing factory-correct procedures and specifications.
Engine:
Full engine disassembly, assembly, tuning, and troubleshooting
Transmission:
4-speed manual transmission service and repair
Drivetrain:
Primary drive, clutch, belt/chain drive systems
Chassis:
Frame, forks, suspension (front and rear), wheels, and bearings
Brakes:
Front and rear brake systems (hydraulic disc, drum)
Electrical:
Ignition system, lighting, charging system, starter, wiring diagrams
Fuel System:
Carburetor (likely Keihin or Linkert), fuel lines, fuel tank
Exhaust System:
Exhaust pipes, mufflers, mounting hardware
Bodywork:
Fenders, tank, seat, handlebars, controls
Maintenance:
Routine service, lubrication, adjustments, fluid changes
Troubleshooting:
Diagnostic charts, common problems and solutions
Repair:
Step-by-step repair instructions for all major components
Overhaul:
Complete engine and transmission rebuild procedures
Specifications:
Torque values, clearances, tolerances, part numbers
Depth:
Comprehensive factory-level detail for professional technicians and experienced DIYers
Engine Type:
Air-cooled, 45-degree V-twin, OHV (Overhead Valve)
Engine Code:
Shovelhead (Evo engine introduced in 1984)
Bore X Stroke:
3.4375 in. x 4.25 in. (87.3 mm x 108 mm) - Typical for 80 cubic inch (1340cc) Shovelheads
Horsepower:
Approx. 65-70 HP (estimated, varies by tune)
Torque:
Approx. 80-85 ft-lbs (estimated)
Carburetor Type:
Harley-Davidson Linkert M-series or Keihin Butterfly (specific model dependent)
Fuel Type:
Unleaded gasoline, minimum 91 octane recommended
Oil System:
Dry sump lubrication system
Oil Capacity:
Approx. 3.5 US quarts (3.3 liters) with filter change
Ignition System:
Breaker points ignition (early 1980) or electronic ignition (later 1980 models)
Wheelbase:
Approx. 60.5 inches (1537 mm)
Length:
Approx. 90 inches (2286 mm)
Dry Weight:
Approx. 550-600 lbs (250-272 kg), varies by model variant
Gross Vehicle Weight Rating:
Refer to vehicle specific VIN plate
Crash Safety:
Not applicable in the same way as modern automotive; focus on rider safety features.
Braking System:
Hydraulic disc front, drum rear (typical for FX models of this era).
Lighting:
Headlight, taillight, brake light, turn signals
Chassis Stability:
Frame rigidity and suspension tuning are critical for rider safety.
Oil Change:
Every 2,000-3,000 miles or annually (refer to manual for exact specification)
Spark Plugs:
Inspect/replace at 5,000-10,000 miles
Drive Belt:
Inspect tension and condition every 2,000 miles, replace as needed (typically 20,000-40,000 miles)
Engine Oil:
Viscosity typically SAE 20W-50 or 25W-50 for air-cooled V-twins (refer to manual for specific Harley-Davidson recommendation, e.g., HD-360 or similar)
Primary Chain Case Oil:
Specific Harley-Davidson primary chain case lubricant or compatible fluid.
Brake Fluid:
DOT 4 (typically, verify for drum or disc systems)
Shovelhead Lifters:
Potential for noisy lifters, requires periodic adjustment.
Carburetor Tuning:
Carburetors can require frequent tuning and adjustment for optimal performance and fuel economy.
Oil Leaks:
Common for older Harley-Davidsons; seals and gaskets may degrade over time and require replacement.
Electrical Reliability:
Wiring harnesses and older electrical components can be prone to wear and require inspection.
Founding:
Harley-Davidson Motor Company founded in 1903.
Fx Lineage:
The FX designation historically refers to 'Factory Experimental' models, often featuring a blend of Shovelhead engines in the softer-styled frames compared to the FL (Electra Glide) models.
Shovelhead Era:
The Shovelhead engine, introduced in 1966, continued through 1984. 1980 marked the later stages of its development.
Production Period:
Harley-Davidson FX models were produced across several decades, with the 1340cc Shovelhead engine in the FX platform continuing through the early 1980s.
Manufacturing Location:
Milwaukee, Wisconsin, USA
