Market Segment:
Classic American V-Twin motorcycle touring segment
Competitors Era:
Indian Motorcycles (emerging), custom V-twins, and some European touring bikes
Vehicle Appeal:
Iconic styling, powerful V-twin rumble, long-distance touring capability
Manual Value Proposition:
Essential resource for maintaining and restoring a legendary Harley-Davidson model
Overall Coverage:
Complete official factory service and repair
Estimated Page Count:
Hundreds (specific number not provided in product info, but indicative of comprehensive coverage)
Manual Type:
Workshop Service Repair Manual
Format:
Downloadable (implies digital format, likely PDF)
Engine System:
Shovelhead V-Twin engine overhaul, tuning, and diagnostics
Transmission System:
4-speed constant mesh transmission service and repair
Electrical System:
Ignition, lighting, charging system, wiring diagrams, and troubleshooting
Fuel System:
Carburetor service (likely Keihin or Linkert variants), fuel lines, and fuel tank maintenance
Brake System:
Front and rear brake system inspection, repair, and fluid service
Suspension System:
Front fork (leading link or telescoping), rear shock absorbers, and swingarm service
Chassis And Frame:
Frame inspection, steering head bearing service, and general chassis maintenance
Wheels And Tires:
Wheel bearing service, tire inspection, and spoke tensioning
Routine Maintenance:
Oil changes, filter replacement, spark plug service, chain adjustment
Diagnostic Procedures:
Troubleshooting charts for common performance issues and component failures
Rebuild Procedures:
Complete engine disassembly, inspection, and reassembly instructions
Adjustment Procedures:
Carburetor tuning, ignition timing adjustment, clutch and brake lever adjustment
Depth Of Information:
Factory-level detail, suitable for professional mechanics and advanced DIY enthusiasts
Engine Type:
Air-cooled, OHV, V-twin
Engine Family:
Shovelhead
Displacement:
74 cubic inches (1200 cc)
Bore X Stroke:
3.4375 in x 4.00 in (87.31 mm x 101.60 mm) (typical for 74ci Shovelhead)
Compression Ratio:
Approximately 8.0:1 (varies slightly by year and specific model)
Horsepower:
Approx. 60-65 HP (estimated at crankshaft, factory specs often not explicit)
Torque:
Approx. 65-70 ft-lbs (estimated at crankshaft)
Carburetor Type:
Typically Keihin butterfly or Linkert (depending on specific build/options for '75)
Fuel Type:
Unleaded gasoline, minimum 87 octane (check specific manual for exact recommendations)
Oil Capacity:
Approximately 3 quarts (2.84 liters) of engine oil
Oil Type:
SAE 20W50 motorcycle oil (mineral-based recommended for this era)
Transmission Type:
4-speed constant mesh, foot shift, hand clutch
Transmission Fluid Type:
Harley-Davidson recommended transmission lubricant or equivalent SAE 80W-90 gear oil
Clutch Type:
Wet multi-plate, cable operated
Safety Ratings Era:
No formal crash ratings or standardized safety scores common for motorcycles of this era
Braking System:
Dual-action front brake (single disc), rear drum brake
Lighting:
Headlight, taillight, brake light, turn signals
Infotainment Features:
None (This is a 1975 model, technology is analog and mechanical)
Driver Assistance Features:
None (This is a 1975 model, technology is analog and mechanical)
Connectivity Features:
None (This is a 1975 model, technology is analog and mechanical)
Oil Change Interval:
Every 2,000-3,000 miles or annually, whichever comes first (typical for era)
Ignition Timing Check:
Check and adjust as needed, often during major services or if performance issues arise
Carburetor Adjustment:
Periodic checks for optimal performance, especially with fuel changes
Engine Oil Specification:
SAE 20W50 Motorcycle Oil (API SG or higher, or equivalent)
Transmission Oil Specification:
SAE 80W-90 Gear Oil or Harley-Davidson transmission lubricant
Primary Chaincase Oil:
Typically shares engine oil, but specific capacities and checks are detailed in manual
Shovelhead Engine Quirks:
Potential for oil leaks, valve guide wear, oil pump efficiency limitations
Transmission Wear:
Gear engagement issues, bearing wear, clutch plate wear are common with age and mileage
Electrical System Aging:
Degradation of wiring insulation, rectifier/regulator failures, battery charging issues
Preventative Maintenance:
Regular lubrication of pivot points, cable adjustments, and thorough inspection
Brand Establishment:
Founded in 1903, Harley-Davidson is an American icon in motorcycle manufacturing
Shovelhead Introduction:
The Shovelhead engine replaced the Panhead in 1966 and was produced until 1984
Flh Designation:
FLH traditionally signifies a large frame, touring-oriented model
Production Period:
1975 model year
