🏷️ Basic Information

Make:

Harley-Davidson

Model:

FL / FLH

Product Type:

Replacement Parts Manual

Covered Model Codes:

FL, FLH (includes variations such as Hydra-Glide, Duo-Glide, Electra-Glide)

👋 Introduction

Target Audience:

Harley-Davidson owners, mechanics, restorers, and parts suppliers working on FL/FLH models from 1941-1984

Value Proposition:

Essential reference for accurate identification and sourcing of original or replacement parts, crucial for maintaining vintage Harley-Davidsons.

Uniqueness:

Provides specific OEM part numbers and detailed visual breakdowns for a broad, iconic range of Harley-Davidson motorcycles.

Feature 1:

Comprehensive coverage across 40+ years of iconic FL/FLH models.

Feature 2:

Detailed exploded view diagrams for every major component group.

Feature 3:

Inclusion of original Harley-Davidson part numbers.

Feature 4:

Organized by vehicle systems for efficient part lookup.

📋 Manual Details

Coverage Period:

1941-1984

Estimated Page Count:

Varies by specific edition/print, typically extensive for this long coverage period (e.g., 300-600+ pages)

Manual Type:

OEM Parts Manual / Parts Catalog

Language:

English

Format:

Printed

📖 Manual Coverage

Engine:

Includes all internal and external engine components for applicable OHV V-twin engines (Panhead, Shovelhead, Knucklehead)

Transmission:

Covers 4-speed constant mesh transmission components

Drivetrain:

Includes primary drive, final drive, chain, sprockets, and related hardware

Chassis:

Frame, forks, swingarm, wheels, bearings, and suspension components

Electrical:

Wiring harness components, ignition system parts, lighting, generator/alternator, starter, battery box

Fuel System:

Carburetor components, fuel tanks, fuel lines, petcock

Braking System:

Brake drums, shoes, linkage, master cylinders (where applicable), brake pedal components

Bodywork And Trim:

Fenders, gas tanks, seat pans, saddlebags, fairings (for later models), chrome trim, emblems

Controls:

Handlebars, levers, cables, footpegs, shifters, brake pedals

Disassembly Aid:

Exploded parts diagrams clearly illustrate the order and relationship of components for easier disassembly

Assembly Aid:

Diagrams facilitate correct reassembly by showing part placement and orientation

Part Identification:

All parts are listed with their corresponding OEM part numbers for accurate ordering

Component Grouping:

Parts are organized into logical sections corresponding to vehicle systems and assemblies

Depth Of Coverage:

Comprehensive parts listing; does not include repair procedures or torque specifications, but is essential for identifying correct replacement parts.

📊 Manual Specifications

Digital Format If Applicable:

N/A (Printed Product)

Diagram Clarity:

Illustrated with Exploded Parts Diagrams for clarity

Text Legibility:

High quality print ensuring legibility of part numbers and descriptions

Binding Method:

Typically saddle-stitched or perfect bound for durability in a workshop environment

Paper Quality:

Durable paper stock suitable for workshop use, resistant to grease and dirt

⚙️ Engine Specifications

Engine Type:

Air-cooled, overhead valve (OHV), V-twin

Engine Family Examples:

Knucklehead (E, F series), Panhead (EL, FL series), Shovelhead (FLH series)

Displacement Examples:

61 cu. in. (1000cc), 74 cu. in. (1200cc), 80 cu. in. (1340cc - later models)

Horsepower Range Approximate:

Varies significantly by engine and year, typically 45-65+ HP

Torque Range Approximate:

Varies significantly by engine and year, typically 55-75+ ft-lbs

Fuel Delivery Examples:

Linkert Carburetors (various models), Keihin Carburetors (later models)

Fuel Type:

Gasoline (Octane requirements varied, typically recommend premium or leaded fuel for older engines)

🔧 Transmission

Transmission Type:

4-speed constant mesh, foot clutch and hand shift (early models), foot shift (later models)

Optional Transmission:

N/A for this period; 4-speed was standard

Transmission Oil Spec Example:

API GL-4 75W-90 or 80W-90 gear oil (specifics may vary, consult service manual for precise recommendations)

📐 Dimensions

Wheelbase Range Approximate:

Approximately 60-63 inches

Overall Length Range Approximate:

Approximately 85-90 inches

Dry Weight Range Approximate:

Approximately 550-700 lbs depending on model and accessories

Gross Vehicle Weight Rating Example:

Typically around 850-950 lbs

🛡️ Safety Features

Safety Ratings Applicability:

N/A (Motorcycle safety ratings are not comparable to automotive standards of this era)

Active Safety Features Example:

Mechanical drum brakes (front and rear), requiring skilled operation.

Passive Safety Features Example:

Sturdy steel frame construction, rider positioning for stability.

💡 Technology Features

Infotainment Features:

N/A (These models predated modern infotainment systems; focus is on mechanical and electrical components.)

🔧 Maintenance

Oil Change Interval Example:

Typically every 2,000-3,000 miles or annually, depending on usage and oil type.

Transmission Oil Change Interval Example:

Every 5,000-10,000 miles or as specified in a service manual.

Spark Plug Replacement Example:

Every 5,000-10,000 miles.

Engine Oil Recommendation Example:

Viscosity typically SAE 20W-50 or SAE 50 for older engines, often using specific motorcycle-specific oils with ZDDP additive. Consult service manual for precise recommendations based on engine type and climate.

Primary Chain Case Oil Recommendation Example:

Often shared engine oil or a dedicated primary lubricant (e.g., Harley-Davidson Primary Chain Lubricant). Capacity approx. 1 quart.

Common Wear Items:

Valve guides, lifters, rocker arms, clutch components, cam followers, oil leaks from various seals and gaskets (e.g., primary, transmission, engine cases).

Electrical Wear Items:

Wiring insulation degradation, generator/alternator brushes, starter solenoid, ignition coils.

Braking System Wear Items:

Drum brake shoes, pivot points, and linkage wear.

📚 Vehicle History

Brand Foundation:

Harley-Davidson Motor Company, founded in 1903, a legendary American motorcycle manufacturer.

Evolution Of Fl Flh:

The FL designation represented Harley-Davidson's big twin models. Over the decades, it evolved through distinct engine generations (Knucklehead, Panhead, Shovelhead) and chassis updates, incorporating innovations like hydraulic front suspension (Hydra-Glide), electric start, and improved braking systems. The FLH typically signified a higher performance or touring variant.

Production Period:

FL and FLH models have been in continuous production in various forms since the 1940s, with this manual covering a significant evolutionary span.

🏆 Awards & Recognition

Model Significance:

These models are iconic and represent significant eras in Harley-Davidson's history, achieving cult status among enthusiasts and collectors.

Historical Impact:

The FL/FLH series laid the foundation for Harley-Davidson's touring and cruiser motorcycles, establishing brand identity and performance benchmarks for decades.

Manual Certification:

OEM (Original Equipment Manufacturer) specification, providing factory accuracy for parts.