🏷️ Basic Information

Make:

Harley-Davidson

Model:

FLH Shovelhead

Year:

1974

Motorcycle Type:

Touring Motorcycle

Engine Family Code:

Shovelhead

Model Designation:

FLH (often denotes the Electra Glide model with full touring features)

👋 Introduction

Era Significance:

The 1974 FLH Shovelhead represents a significant era for Harley-Davidson, a period of refinement for the Shovelhead engine and the iconic Electra Glide platform. It catered to riders seeking long-distance comfort and the unmistakable V-twin rumble.

Competitors:

In its era, the FLH competed with other large-displacement touring motorcycles, though its distinct character and brand loyalty often set it apart. Competitors might include certain British touring bikes or earlier models from Japanese manufacturers, but the Shovelhead held a unique position.

Vehicle Appeal:

Classic styling, powerful V-twin engine, comfortable touring ergonomics, extensive customization potential, iconic Harley-Davidson heritage.

Manual Benefit:

Essential for owners and mechanics to maintain, repair, and restore the 1974 FLH Shovelhead, ensuring longevity and optimal performance of this classic machine.

📋 Manual Details

Primary Coverage:

Comprehensive service and repair procedures for the 1974 Harley-Davidson FLH Shovelhead Motorcycle.

Secondary Coverage:

Maintenance, troubleshooting, and technical specifications.

Estimated Page Count:

Varies by specific publisher, but typically 300-500 pages for a complete workshop manual of this era.

Type:

Workshop Service Repair Manual

Language:

English

Format:

Downloadable (likely PDF)

📖 Manual Coverage

Engine Systems:

Engine disassembly, assembly, inspection, tuning, carburetor service (e.g., Keihin, Linkert), ignition system (points, coil, condenser), oiling system, cooling system (air cooling), lubrication.

Transmission Drivetrain:

4-speed constant mesh transmission service and repair, clutch assembly, primary drive, final drive belt/chain maintenance and adjustment.

Chassis Suspension:

Front fork (e.g., leading-link, telescopic) overhaul and adjustment, rear shock absorber service and replacement, frame inspection and repair, steering head bearing maintenance.

Braking System:

Front and rear brake service (drum or early disc), hydraulic system maintenance, caliper/wheel cylinder overhaul, brake pad/shoe replacement.

Electrical System:

Wiring diagrams, battery service, charging system (generator/alternator), lighting system (headlight, taillight, signals), starter motor, ignition switch, instrument cluster diagnosis.

Bodywork Fittings:

Fender removal and installation, fuel tank servicing and mounting, seat assembly, fairing (if equipped) and saddlebag maintenance.

Maintenance Tasks:

Routine checks (oil level, tire pressure, chain slack), lubrication points, filter replacement (oil, air), spark plug service, battery charging.

Repair Tasks:

Engine rebuilds, transmission overhaul, carburetor tuning, brake system repairs, electrical fault finding, suspension component replacement.

Troubleshooting Diagnostics:

Step-by-step guides for diagnosing common problems with engine performance, electrical systems, and chassis components.

Depth:

Comprehensive, covering everything from basic maintenance and adjustments to complete engine and transmission rebuilds. Includes detailed torque specifications, clearances, and diagnostic procedures.

📊 Manual Specifications

Digital Format:

PDF (Portable Document Format) for digital distribution.

Digital Quality:

High resolution for clear readability of text, diagrams, and images. Searchable text functionality is often a key feature.

Physical Binding:

N/A (Digital Download)

Digital Paper Simulation:

N/A (Digital Download)

⚙️ Engine Specifications

Engine Type:

Air-cooled, 45-degree V-twin

Engine Family:

Shovelhead

Displacement:

74 cubic inches (1200cc)

Bore X Stroke:

Approximately 3.4375 in. x 4.25 in. (87.3 mm x 108 mm)

Compression Ratio:

Typically around 8.0:1 to 8.5:1 for stock configuration

Valve Train:

Overhead valve (OHV), pushrod actuated

Horsepower:

Estimated 60-70 HP at the crankshaft (depending on tune and specific configuration)

Torque:

Estimated 70-80 ft-lbs (95-108 Nm) at the crankshaft

Carburetor:

Often a Keihin Butterfly or a Linkert carburetor (model dependent, e.g., 90 series)

Fuel Type:

Unleaded gasoline, octane rating typically 91 or higher

Ignition Type:

Contact breaker points, single ignition coil

Oil Capacity:

Approximately 3 US quarts (2.8 liters) including primary chain case.

Oil Type:

Harley-Davidson Genuine V-Twin Oil or equivalent API SG/SH rated motorcycle oil, SAE 20W-50 recommended.

🔧 Transmission

Type:

4-speed, constant mesh

Gear Ratios:

Specific ratios vary, but typically geared for cruising and torque delivery.

Clutch Type:

Wet multi-plate clutch

Primary Drive:

Heavy-duty silent chain drive within a sealed primary case.

Transmission Oil:

Harley-Davidson Genuine Transmission Oil or SAE 80W-90 GL-4 gear oil.

📐 Dimensions

Wheelbase:

Approximately 62.5 inches (1588 mm)

Length:

Approximately 90 inches (2286 mm)

Dry Weight:

Approximately 650-700 lbs (295-318 kg), depending on touring accessories.

Gross Vehicle Weight Rating:

Typically around 1000-1100 lbs (454-499 kg)

🛡️ Safety Features

Crash Test Ratings:

N/A (Motorcycles are not subject to the same standardized crash testing as cars).

Braking System Type:

Front: Disc brake (often 10-inch disc with a 4-piston caliper); Rear: Drum brake.

Lighting:

Halogen headlight, taillight, brake light, turn signals.

Frame Construction:

Robust steel frame designed for stability and load-carrying capacity.

💡 Technology Features

Features:

Basic instrumentation including speedometer, odometer, ammeter, and indicator lights. No advanced infotainment systems.

Features:

No electronic driver assistance features; relies on mechanical controls and rider input.

Features:

No digital connectivity features.

🔧 Maintenance

Oil Change Interval:

Every 2,000-3,000 miles (3,200-4,800 km) or annually, whichever comes first. Primary chain case oil should be changed concurrently.

Tune Up Interval:

Recommended every 4,000-6,000 miles (6,400-9,600 km), including spark plug inspection/replacement, points and timing adjustment, carburetor cleaning and adjustment.

Chain Adjustment:

Primary chain: Inspect and adjust every 1,000 miles (1,600 km) to maintain specified slack.

Engine Oil Viscosity:

SAE 20W-50

Transmission Oil Viscosity:

SAE 80W-90 GL-4

Brake Fluid:

DOT 3 or DOT 4 hydraulic brake fluid (if equipped with disc brakes).

Engine Leaks:

Common for Shovelheads to develop minor oil leaks from crankcase seals, rocker boxes, and pushrod tubes. Requires regular inspection and gasket replacement.

Carburetor Tuning:

Carburetors of this era can be finicky and require periodic adjustments for optimal performance and fuel economy.

Ignition Timing:

Points-based ignition systems require precise timing adjustments for proper engine operation.

Oil Filter Part Number:

Early Shovelheads may use an internal oil filter element or a centrifugal filter. Specific part numbers vary by manufacturer and filter type (e.g., aftermarket equivalents often used).

Spark Plug Part Number:

Commonly Champion H8C or equivalent (check manual for exact fitment).

📚 Vehicle History

Harley Davidson Legacy:

Harley-Davidson, founded in 1903, is an iconic American motorcycle manufacturer renowned for its V-twin engines, robust engineering, and distinct rider community.

Shovelhead Introduction:

The Shovelhead engine, introduced in 1966 as an evolution of the Panhead, featured distinctive rocker boxes resembling a shovelhead. It powered Harley-Davidson motorcycles through the 1960s, 70s, and into the early 80s.

Flh Development:

The FLH (Electra Glide) designation signified Harley-Davidson's premier full-dresser touring model, featuring extensive fairings, saddlebags, and a comfortable seat, designed for long-distance travel.

Production Period:

Shovelhead engines were produced from 1966 to 1984. The FLH model variant with the Shovelhead engine was produced throughout this period.

🏆 Awards & Recognition

Model Icon Status:

The Harley-Davidson Shovelhead, including the FLH variant, is widely regarded as a motorcycling icon, celebrated for its enduring style and performance.

Vintage Bike Reviews:

Frequently appears in 'best vintage motorcycle' lists and is highly sought after by collectors and enthusiasts.

Heritage Status:

Recognized as a significant piece of American industrial and cultural heritage.