Positioning:
Essential resource for owners and technicians of the iconic 1973 Harley-Davidson Sportster XLH, a significant model in the Sportster lineage.
Value Proposition:
This manual is indispensable for maintaining the performance, reliability, and originality of a vintage Harley-Davidson, commanding a premium for its accuracy and detail compared to aftermarket guides.
Features:
Factory-authorized procedures, detailed illustrations, troubleshooting guides, and precise specifications ensure accurate repairs and maintenance.
Engine:
Detailed coverage of the Ironhead Sportster engine, including teardown, assembly, specifications, and troubleshooting.
Transmission:
Coverage of the 4-speed constant mesh transmission, including clutch, gearbox, and final drive components.
Electrical:
Comprehensive electrical system diagrams, troubleshooting for ignition, lighting, charging system, and accessories.
Chassis:
Frame, suspension (forks and rear shocks), steering, and wheel components.
Brakes:
Front and rear brake systems, including drum brake mechanisms, and hydraulic components if applicable.
Fuel System:
Carburetor (likely a Linkert or early Keihin/S&S) adjustment, cleaning, and overhaul; fuel tank and lines.
Exhaust:
Exhaust system components and installation.
Bodywork:
Fenders, fuel tank, seat, and other body panels.
Maintenance:
Scheduled maintenance, lubrication, oil changes, filter replacements, and tune-ups.
Troubleshooting:
Systematic diagnostic procedures for common and uncommon issues.
Repair:
Step-by-step instructions for engine rebuilds, transmission overhauls, electrical system repairs, and chassis component replacement.
Disassembly Assembly:
Detailed instructions for component removal and reinstallation.
Depth:
Comprehensive: Covers routine maintenance, component-level repair, and full engine/transmission rebuilds. Suitable for experienced home mechanics and professional technicians.
Digital Quality:
If digital, expect clear scans of original pages, potentially searchable text if OCR processed.
Print Quality:
Original factory manuals were printed on durable paper with clear diagrams and text.
Binding Type:
Originals were typically saddle-stitched or perfect bound. Digital versions are files.
Paper Type:
Durable, sometimes glossy paper stock for diagrams and illustrations.
Engine Type:
Air-cooled, V-twin, OHV (Overhead Valve) 'Ironhead' Sportster engine.
Displacement:
Typically 998cc (61 cubic inches) or 1000cc for the XLH model, depending on specific variant within the year.
Bore X Stroke:
Example: 3.1875 in. x 3.625 in. (actual values can vary slightly based on specific engine build).
Compression Ratio:
Typically around 8.0:1 to 9.0:1 (verify in manual for exact spec).
Cylinder Heads:
Cast Iron
Horsepower:
Estimated 50-60 HP (varies by tune and specific model year).
Torque:
Estimated 55-65 ft-lbs (varies by tune and specific model year).
Carburetor Type:
Likely a Linkert M-Series carburetor, or potentially an early Keihin Butterfly or S&S Super E/B carburetor depending on dealer modifications or factory options for that year.
Fuel Type:
Unleaded gasoline (as leaded fuel was phased out, manual may specify octane requirements).
Ignition Type:
Contact breaker points and coil ignition system.
Oil System:
Dry Sump lubrication system with oil tank typically located beneath the seat or frame.
Transmission Type:
4-speed constant mesh, foot-shifted
Clutch Type:
Wet, multi-plate clutch, cable-operated
Gear Selection:
Heel-toe shifter (right side operation).
Wheelbase:
Approx. 58.5 inches (1486 mm) (verify with manual for exact spec).
Length:
Approx. 85 inches (2159 mm) (verify with manual for exact spec).
Dry Weight:
Approx. 465-485 lbs (211-220 kg) (verify with manual for exact spec).
Fuel Capacity:
Approx. 3.0 gallons (11.4 liters) (verify with manual for exact spec).
Oil Capacity:
Approx. 3 US quarts (2.8 liters) for the dry sump system (verify with manual for exact spec).
Safety Certification:
N/A for this era of motorcycle; safety features were determined by manufacturer standards and local regulations.
Braking System:
Mechanical drum brakes front and rear.
Lighting:
Halogen headlight, taillight, brake light, turn signals (if equipped).
Frame Construction:
Steel backbone frame.
Oil Change Interval:
Typically every 1,500-3,000 miles or annually, depending on usage (refer to manual for exact interval).
Spark Plug Replacement:
Check condition at every 1,500-3,000 miles; replace as needed (verify in manual).
Chain Adjustment:
Check and adjust tension regularly, typically every 500-1,000 miles, or as it stretches.
Valve Adjustment:
Periodic adjustment required, usually every 3,000-6,000 miles (refer to manual for procedure).
Engine Oil Type:
Varies, but typically SAE 50 or 20W-50 motorcycle-specific oil. Avoid oils with excessive friction modifiers. (Consult manual for exact specification and approved brands).
Transmission Oil Type:
Dedicated Harley-Davidson transmission fluid or a suitable SAE 75W-90 gear oil might be recommended. (Consult manual for exact specification).
Primary Chain Case Oil:
Often shares oil with the engine or transmission depending on the specific model year configuration. (Consult manual for exact specification).
Fork Oil Type:
Specific weight of fork oil, e.g., SAE 10W or 15W (verify with manual).
Common Wear Items:
Valve guides, cam followers, primary chain tensioner, oil leaks from seals and gaskets, carburetor wear.
Electrical Issues:
Older wiring can become brittle, ignition system components (points, condenser, coil) can require frequent attention, charging system output.
Engine Vibration:
Characteristic of the Ironhead engine, but worn mounts can exacerbate this.
Carburetor Performance:
Linkert carburetors can be finicky and require regular cleaning and adjustment; later models may have had aftermarket replacements.
Brand History:
Harley-Davidson, established in 1903, is an iconic American motorcycle manufacturer known for its V-twin engines and robust designs.
Sportster Lineage:
The Sportster model debuted in 1957 and has been a staple of the Harley-Davidson lineup, evolving significantly over the decades. The 1973 model represents the continuation of the 'Ironhead' era.
Manufacturing Location:
United States (primarily Milwaukee, Wisconsin).
Production Period:
The 'Ironhead' Sportster engine was produced from 1957 to 1985.
