Target Audience:
Do-it-yourselfers and experienced mechanics seeking comprehensive repair information
Value Proposition:
Inexpensive way to keep the vehicle working properly, providing detailed, factory-level repair guidance
Convenience:
Print only needed pages or the entire manual, immediate download no shipping wait
Quality Level:
Professional quality, in-depth service and repair manual
Engine:
Comprehensive coverage of the Shovelhead engine
Drivetrain:
Clutch, Primary Drive, Transmission
Fuel System:
Detailed coverage of fuel delivery and carburetor systems
Exhaust System:
Coverage of exhaust components and service
Electrical System:
Extensive coverage including detailed wiring diagrams
Suspension:
Front and Rear Suspension systems
Steering:
Steering mechanism and service
Brakes:
Brake system service and repair
General Information:
Included
Troubleshooting:
Comprehensive troubleshooting guidance
Lubrication:
Periodic lubrication procedures and schedules
Maintenance:
Detailed maintenance procedures
Tune Up:
Engine tune-up procedures
Engine Overhaul:
Procedures for complete engine disassembly and reassembly
Electrical Diagnosis:
Diagnostic procedures for electrical system issues
Component Replacement:
Step-by-step instructions for replacing various components
Depth:
Complete disassembly of the machine, suitable for do-it-yourselfers and experienced mechanics
Presence:
Hundreds of photos and illustrations
Format:
Step-by-step numbered instructions
Highlighting:
Notes, cautions, and warnings throughout each chapter
Engine Type:
Shovelhead V-twin (Air-cooled)
Displacement:
Typically 74 cubic inches (1200cc) and 80 cubic inches (1340cc) for Shovelheads of this era. Specific to the FX model, likely 74ci.
Horsepower:
Approximate: 50-60 HP (depending on variant and tuning). Exact figures not provided in product description.
Torque:
Approximate: 65-75 ft-lbs (depending on variant and tuning). Exact figures not provided in product description.
Carburetor:
Typically Keihin Butterfly or Linkert (depending on specific FX sub-model and region). Manual covers the specific systems fitted.
Type:
Contact breaker points ignition system, likely with mechanical advance. Manual would cover timing and maintenance.
Type:
Dry sump lubrication system. Manual details oil tank, pump, and filter service.
Type:
4-speed constant mesh, foot-shifted, hand-clutched.
Shifting Mechanism:
Right-side shifter (foot shift) with left-side clutch lever.
Type:
Chain drive, enclosed in a primary case. Manual covers clutch, chain adjustment, and primary cover service.
Fluid Type:
Manual will specify appropriate transmission and primary chaincase lubricant (e.g., Harley-Davidson Formula+, SAE 50 motorcycle oil).
Crash Test Data:
N/A (Motorcycle - safety ratings not applicable in the same way as cars)
Braking System:
Front disc brake, rear drum brake (typical for FX models of this era). Manual details brake caliper service, fluid replacement, and adjustment.
Lighting:
Headlight, taillight, brake light, turn signals. Manual covers bulb replacement and electrical troubleshooting.
Oil Change:
Typically every 2,000-3,000 miles or annually. Manual will provide specific intervals.
Spark Plugs:
Regular inspection and replacement as needed, often coinciding with tune-ups. Manual will specify type and gap.
Chain Adjustment:
Primary and final drive chain adjustment as needed, often every few thousand miles. Manual details the procedure and slack specifications.
Engine Oil:
Harley-Davidson recommends specific grades of oil (e.g., SAE 20W50 or SAE 50 motorcycle oil) for Shovelheads. Manual will confirm exact specifications and capacity.
Transmission Oil:
Specific motorcycle transmission oil or Harley-Davidson Formula+. Manual will detail type and capacity.
Brake Fluid:
DOT 3 or DOT 4 brake fluid. Manual will specify type and replacement intervals.
Oil Leaks:
Common with older Harley-Davidsons due to gasket and seal aging. Manual provides guidance on seal replacement.
Carburetor Tuning:
Can require periodic adjustment for optimal performance and starting. Manual covers carburetor overhaul and tuning.
Electrical Gremlins:
Older electrical systems can be prone to issues with wiring insulation, connections, and charging systems. Manual's wiring diagrams are crucial.
Legacy:
Harley-Davidson: Iconic American motorcycle manufacturer with a long history of V-twin engines and custom styling.
Shovelhead Generation:
The Shovelhead engine, introduced in the early 1960s, was a successor to the Panhead and predecessor to the Evolution engine. It marked a period of significant development for Harley-Davidson.
Fx Series:
The FX designation typically represented 'Factory Experimental' or custom styling, often featuring a blend of Big Twin engines in lighter frames, or specific custom configurations. The 1978 FX would be a distinct model within this line.
Manufacturing Era:
Shovelhead engines were produced from 1966 to 1984. The 1978 model falls within the latter half of this production run.
