Target User:
Professional mechanics and dedicated DIY enthusiasts seeking in-depth technical knowledge.
Manual Value:
Essential for owners of the 1973 Sportster XLT, offering a level of detail not found in owner's manuals. Critical for maintaining originality and proper function.
Feature Depth:
Detailed illustrations, exploded views, diagnostic flowcharts, and precise technical data.
General Coverage:
Complete repair and service information for the 1973 Harley-Davidson Sportster XLT.
Estimated Pages:
Refer to product for exact count; typically 200-500 pages for a comprehensive factory service manual of this era.
Type:
Factory Service Repair Manual
Format:
Likely Printed, potentially available as a PDF scan.
Engine:
Full engine disassembly, assembly, inspection, and repair of the Ironhead V-twin.
Transmission:
Service and repair of the 4-speed constant mesh transmission.
Electrical System:
Wiring diagrams, component testing, troubleshooting of ignition, lighting, and charging systems.
Fuel System:
Carburetor (e.g., Linkert or Keihin) service, fuel tank, fuel lines, and fuel pump (if applicable).
Brakes:
Drum brake system inspection, adjustment, and component replacement.
Suspension And Steering:
Front fork (e.g., leading axle) and rear shock absorber service, steering head bearing maintenance.
Frame And Bodywork:
Frame inspection, sheet metal repair, mounting procedures for fenders, tank, and seat.
Maintenance:
Scheduled maintenance, lubrication, filter changes, ignition timing adjustments.
Troubleshooting:
Diagnostic procedures for common running issues, electrical faults, and mechanical failures.
Repair:
Detailed step-by-step instructions for component repair and replacement.
Disassembly Assembly:
Complete guide to taking apart and reassembling all major vehicle systems.
Diagnostic Level:
Advanced diagnostic procedures for engine performance, electrical circuits, and mechanical wear.
Rebuild Scope:
Comprehensive rebuild procedures for engine, transmission, and major components.
Specification Detail:
Detailed torque specifications, clearances, timing marks, and critical measurements.
Digital Format:
If PDF, expected quality is good for reproduction and searching. Resolution will depend on the original scan.
Print Quality:
For printed versions, expect factory-grade paper and clear, legible text and diagrams.
Binding:
Typically perfect bound or saddle-stitched for printed manuals.
Paper Quality:
Durable paper stock suitable for workshop environments.
Engine Type:
Air-cooled, 45-degree V-twin OHV (Ironhead)
Displacement:
73.7 cubic inches (1200cc)
Bore X Stroke:
3.4375 in. x 4.25 in. (87.3 mm x 108 mm)
Compression Ratio:
Approximately 8.0:1
Horsepower Est:
Approx. 55-60 HP at 5500 RPM (factory estimates)
Torque Est:
Approx. 65-70 ft-lbs at 3500 RPM (factory estimates)
Carburetor Type:
Likely Linkert M-Series (e.g., M74) or Keihin Butterfly (early production). Manual will detail the specific variant.
Fuel Octane Rating:
86-89 octane (lead or unleaded, depending on engine modifications/availability).
Ignition Type:
Battery & Coil, Magneto ignition was phased out by this era, but manual will confirm.
Transmission Type:
4-speed, constant mesh, foot shift, hand clutch
Clutch Type:
Wet, multi-plate, cable-actuated
Transmission Fluid Type:
Refer to manual for specific Harley-Davidson transmission lubricant or equivalent SAE 50/70W gear oil.
Wheelbase:
Approx. 58.5 inches (1486 mm)
Length:
Approx. 87 inches (2210 mm)
Dry Weight:
Approx. 475-500 lbs (215-227 kg)
Gross Vehicle Weight Rating:
Refer to specific model VIN plate, typically around 750-800 lbs.
Fuel Tank Capacity:
Approx. 3.0 US gallons (11.3 liters)
Infotainment System:
N/A for 1973 model; features were basic instrumentation.
Instrument Panel:
Speedometer, odometer, ammeter, indicator lights (e.g., oil pressure, neutral).
Oil Change:
Typically every 1,000-2,000 miles or annually. Manual will specify exact interval and procedure.
Spark Plug Replacement:
Refer to manual; usually around 5,000-10,000 miles. Correct gap is crucial.
Chain Lubrication:
Frequent lubrication and adjustment recommended for drive chain.
Engine Oil Type:
Recommended SAE 20W-50 or 20W-40 motorcycle oil. Manual will specify Harley-Davidson recommended grade or equivalent.
Engine Oil Capacity:
Approx. 3 US quarts (2.8 liters)
Primary Chain Case Fluid:
Typically primary chain case oil or transmission fluid. Manual will detail the correct type and quantity.
Ironhead Leaks:
Common for 'Ironhead' Sportsters to develop oil leaks from gaskets and seals due to age and material degradation. Manual provides repair procedures.
Carburetor Tuning:
Carburetors of this era (Linkert/Keihin) require precise tuning and can be sensitive to altitude and air quality. Manual details adjustment procedures.
Electrical Reliability:
Older electrical systems can be prone to issues with wiring insulation, connections, and component failure. Detailed wiring diagrams in the manual are essential.
Harley Davidson Legacy:
Harley-Davidson, founded in 1903, is an iconic American motorcycle manufacturer known for its V-twin engines and distinctive styling.
Sportster Lineage:
The Sportster line, introduced in 1957, has been a cornerstone of Harley-Davidson's lineup, evolving from overhead valve engines to modern configurations. The 1973 model represents a mature iteration of the 'Ironhead' Sportster.
Manufacturing Location:
Milwaukee, Wisconsin, USA
Production Era:
The 'Ironhead' Sportster, characterized by its cast iron cylinders and heads, was produced from 1957 to 1985.
