Vehicle Segment:
Cruiser motorcycle, performance-oriented model within the Harley-Davidson lineup of the era.
Competitors Era:
Other large displacement V-twins from American and European manufacturers, as well as Japanese models attempting to capture the performance cruiser market.
Vehicle Engine Type:
Shovelhead V-twin engine, known for its character and torque.
Vehicle Design Philosophy:
A blend of classic Harley-Davidson styling with a focus on performance and rider comfort for extended rides.
Manual Value Proposition:
Provides essential, factory-accurate information for maintaining and repairing a classic Harley-Davidson motorcycle, crucial for preserving its value and operational integrity.
Engine:
Shovelhead Engine (e.g., 74ci/1200cc OHV V-twin), including disassembly, assembly, troubleshooting, and diagnostics.
Fuel System:
Carburetor systems (e.g., Keihin butterfly, Linkert), fuel pumps, fuel lines, and tank servicing.
Ignition System:
Contact breaker points ignition, spark plugs, coils, wiring, timing procedures.
Transmission:
4-speed constant mesh transmission, clutch system, primary drive, chain adjustment and replacement.
Electrical System:
Wiring diagrams, charging system (alternator/generator), battery, lighting, starter motor, horn, accessory circuits.
Braking System:
Front and rear drum brakes (e.g., Teardrop front, Flanged rear), brake shoe replacement, adjustments, hydraulic systems if applicable.
Suspension:
Front fork (e.g., Showa or original design) servicing, rear shock absorbers, swingarm pivot, lubrication.
Chassis Frame:
Frame inspection, alignment, steering head bearing service, wheel bearings.
Bodywork:
Fender removal/installation, fuel tank servicing, seat mounting, control cable routing, handlebar adjustments.
Wheels Tires:
Wheel spoke tensioning, tire replacement, wheel balancing (basic).
Preventative Maintenance:
Scheduled maintenance, lubrication points, fluid changes, filter replacements, chain care.
Troubleshooting:
Diagnostic charts and procedures for common performance issues, electrical faults, and mechanical failures.
Repair Procedures:
Step-by-step instructions for component removal, overhaul, repair, and reinstallation.
Rebuilds:
Detailed procedures for engine and transmission rebuilds.
Adjustments:
Carburetor adjustment, ignition timing, clutch and brake cable adjustments, suspension preload.
Specifications Charts:
Torque specifications, clearance measurements, fluid capacities, electrical resistance values.
Depth Of Coverage:
Comprehensive, covering all aspects from basic maintenance to complete engine and transmission overhauls. Suitable for professional mechanics and experienced enthusiasts.
Diagnostic Capability:
Detailed diagnostic procedures for identifying and resolving mechanical and electrical problems.
Rebuild Instructions:
Factory-level rebuild instructions for major components.
Engine Family:
Shovelhead
Engine Displacement:
74 cubic inches (approx. 1200cc)
Engine Configuration:
45-degree V-twin, overhead valve (OHV)
Bore X Stroke:
3.4375 in x 4.25 in (87.3 mm x 108 mm)
Compression Ratio:
Approximately 8.0:1 (varies slightly by year/model)
Horsepower Est:
55-65 HP (at crankshaft, estimated)
Torque Est:
75-85 lb-ft (at crankshaft, estimated)
Carburetor Type:
Keihin butterfly, or potentially Linkert on earlier models transitioning to Shovelhead.
Fuel Delivery:
Gravity feed from tank via fuel valve and carburetor, or mechanical fuel pump.
Recommended Fuel:
Unleaded gasoline, 87 octane (minimum, check manual for specifics)
Oil Capacity:
Approximately 3 quarts (2.8 liters) of 20W50 motorcycle oil (check manual for exact spec and type).
Oil Filter Type:
Internal screen filter (engine oil is also transmission and primary chain oil).
Oil Change Interval:
Typically every 2,000-3,000 miles or annually, whichever comes first (check manual for exact recommendation).
Primary Chain Adjustment:
Every 2,000-4,000 miles (check manual).
Spark Plug Replacement:
As needed, or typically every 5,000-10,000 miles (check manual).
Engine Oil Specification:
Harley-Davidson recommends 20W50 motorcycle specific oil. Prior to synthetic oils, conventional oils were standard.
Brake Fluid Type:
DOT 3 or DOT 4 if hydraulic brakes are present (check manual for specific type).
Oil Leaks:
Common due to aged seals and gaskets. Manual will detail seal replacement procedures.
Carburetor Tuning:
Shovelhead carburetors can require frequent adjustment and cleaning. Manual covers tuning and rebuilds.
Electrical Connections:
Corrosion and loose connections can lead to intermittent issues. Manual includes wiring diagrams for troubleshooting.
Carb Spill Control:
Early Shovelheads could experience fuel spills from the carb if the float needle or bowl was faulty. Manual addresses carburetor servicing.
Brand Foundation:
Harley-Davidson Motor Company, founded in Milwaukee, Wisconsin in 1903, is one of the longest-standing motorcycle manufacturers.
Shovelhead Introduction:
The Shovelhead engine was introduced in 1966, replacing the Panhead. The 'SS' designation often referred to a Super Glide variant, known for its blend of style and performance.
Production Period:
The 1974-1976 models represent a key phase in the evolution of the Shovelhead era, leading up to the introduction of the belt-drive Softail and Evolution engines.