Model Code Range:
XLH Series
Production Years Covered:
1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978
Vin Code Range:
1F (typically for North American models, specific year codes may vary)
Positioning:
The Harley-Davidson Sportster XLH of this era was an iconic American motorcycle, known for its raw V-twin power, customizability, and classic styling. It appealed to riders seeking a no-frills, performance-oriented machine with a rich heritage.
Competitors:
Competed with other V-twin cruisers and custom motorcycles from brands like Triumph, BSA, and Japanese manufacturers introducing larger displacement models.
Model Characteristics:
Air-cooled Evolution V-twin engine (though pre-Evolution in many of these years, often Ironhead Sportster), chain drive, kick-start (often with electric start as an option in later years), distinctive Sportster styling.
Primary Coverage:
Full service, repair, and maintenance for Harley-Davidson Sportster XLH models from 1970-1978.
Estimated Pages:
Approx. 300-400 (typical for comprehensive service manuals of this era)
Type:
Factory Service Manual / Repair Manual
Format:
Print (likely a reproduction of original factory documentation)
Engine And Drivetrain:
Engine overhaul, troubleshooting, carburetion, ignition system, clutch, transmission, final drive.
Chassis And Suspension:
Frame, front fork (Girdraulic or Telescopic depending on specific year/model), rear shock absorbers, steering.
Brakes And Wheels:
Brake system (drum brakes primarily for this era), wheel bearing maintenance, tire specifications.
Electrical System:
Wiring diagrams, lighting, battery, charging system (generator/alternator), ignition coils, starter system.
Fuel And Exhaust:
Fuel tank, fuel lines, exhaust system routing and components.
Body And Trim:
Body panels, fenders, seat, handlebars, controls, instrumentation.
Routine Maintenance:
Oil changes, filter replacement, spark plug checks/replacement, chain adjustment, lubrication points.
Troubleshooting:
Diagnostic charts for common performance issues, starting problems, electrical faults.
Major Repairs:
Engine rebuilding (top-end and bottom-end), transmission disassembly and reassembly, fork rebuilds.
Component Replacement:
Step-by-step guides for replacing components like brake shoes, clutch plates, generator/alternator, carburetors.
Electrical Diagnostics:
Testing electrical circuits, diagnosing charging system issues, headlight/taillight problems.
Depth:
Comprehensive, covering detailed disassembly, assembly, torque specifications, clearances, and diagnostic procedures for all major systems.
Digital Format:
N/A (Product specifies print format)
Quality:
Expected to be a high-quality reproduction with clear text and diagrams, mirroring original factory publications.
Binding:
Likely perfect bound or saddle-stitched, designed for workshop use.
Paper:
Durable paper stock suitable for workshop environments.
Engine Type:
Air-cooled, 45-degree V-twin, OHV
Displacement Variants:
Primarily 998cc (61 cu in) and 1000cc (61 cu in), with some earlier models potentially having 883cc (54 cu in) variants. The designation XLH typically refers to the higher performance models.
Bore X Stroke:
Varies by specific model, e.g., 3.1875 in x 3.500 in (998cc)
Compression Ratio:
Typically around 8.0:1 to 9.0:1, depending on the specific year and model variant.
Horsepower Estimated:
Approximately 55-65 hp at the crankshaft (varies by model and tuning)
Torque Estimated:
Approximately 55-60 ft-lbs at the crankshaft (varies)
Carburetor Type:
Typically AMF/Harley-Davidson or Linkert carburetors (e.g., 34mm or 38mm) or later Keihin butterfly carburetors.
Fuel Type:
Unleaded gasoline (as regulations changed during this period, premium unleaded recommended for optimal performance and longevity).
Ignition Type:
Contact breaker points ignition system with mechanical advance.
Oil System:
Dry sump lubrication system with an oil tank separate from the crankcase.
Crash Test Results:
N/A (Motorcycles of this era were not subject to standardized crash testing like automobiles).
Braking System:
Drum brakes front and rear. Front brake typically a single disc starting in the mid-70s, but many earlier models and this range often featured dual leading shoe drum brakes for enhanced stopping power.
Lighting:
Headlight, taillight, brake light, turn signals (depending on market regulations and model specification).
Oil Change Interval:
Typically every 2,000-3,000 miles or annually. Refer to manual for specific intervals based on usage.
Spark Plug Check:
Every 2,000-4,000 miles.
Chain Adjustment:
As needed, typically checking every 1,000 miles. Slack should be between 1/2 to 3/4 inch.
Engine Oil Type:
Harley-Davidson recommended 20W50 motorcycle oil or equivalent (e.g., API SF or SG classification). Refer to manual for specific viscosity based on ambient temperature.
Engine Oil Capacity:
Approx. 3 U.S. quarts (with filter change).
Primary Chain Case Oil Type:
Harley-Davidson primary lubricant or SAE 50 motorcycle gear oil.
Primary Chain Case Oil Capacity:
Approx. 1 U.S. quart.
Transmission Oil Type:
Harley-Davidson transmission lubricant or SAE 50 motorcycle gear oil. Some models may have used a specific primary lubricant.
Transmission Oil Capacity:
Approx. 20-24 fl oz.
Engine Wear Points:
Valve guides, camshaft bushings, and oil pump drive gears can wear over time. Piston ring seal issues.
Electrical System Issues:
Generator/regulator issues, faulty wiring connections, worn ignition points and condensers, weak starter solenoids.
Carburetion Problems:
Carburetor leaks, worn throttle shafts, needle and seat wear leading to flooding or lean conditions.
Transmission Shifting:
Worn shifter bushings, clutch adjustment issues leading to difficult shifting or clutch drag.
Suspension Wear:
Worn fork seals, weak rear shock absorbers, worn steering head bearings.
Harley Davidson Legacy:
Harley-Davidson, founded in 1903, is one of the oldest motorcycle manufacturers in the world, renowned for its V-twin engines, distinct sound, and enduring brand image.
Sportster Lineage:
The Sportster line began in 1957 and has been a cornerstone of Harley-Davidson's lineup, evolving from the K-model. The XLH designation generally represented the higher performance variants, often featuring larger displacements and more potent engines compared to the XLCH (Champion) or XL models.
Manufacturing Location:
United States (primarily York, Pennsylvania, and Milwaukee, Wisconsin assembly plants)
Era Context:
The 1970s marked a period of transition for Harley-Davidson, including the AMF ownership era, which saw both challenges and some innovative developments, though often debated by enthusiasts regarding build quality compared to earlier or later periods.
Model Awards:
While specific awards for individual model years are rare for this era, the Sportster line itself is recognized for its iconic status and contribution to motorcycle culture.
Consumer Ratings:
Highly regarded by enthusiasts for its classic appeal, performance for its time, and customizability. Often collected and restored.
