🏷️ Basic Information

Make:

Harley-Davidson

Model:

FLSTF Fat Boy

Year:

2015

Product Type:

Factory Service Repair Manual

Manual Title:

Harley Davidson FLSTF Fat Boy 2015 Service Repair Manual

👋 Introduction

Positioning:

The FLSTF Fat Boy is a cruiser motorcycle known for its distinctive styling, comfortable ride, and V-twin performance, appealing to riders seeking a classic American motorcycle experience.

Competitors:

Competes with other American V-twin cruisers from brands like Indian Motorcycle, as well as some Japanese cruiser offerings with similar displacement and styling cues.

Vehicle Features:

Iconic fat tire styling, chrome accents, comfortable ergonomics, powerful Twin Cam 103 engine, and Harley-Davidson's renowned V-twin rumble.

Value:

Provides essential technical data, troubleshooting guides, and repair procedures to maintain and repair the 2015 Harley-Davidson FLSTF Fat Boy, empowering owners and technicians alike.

📋 Manual Details

Vehicle Systems:

Engine, Transmission, Drivetrain, Chassis, Suspension, Brakes, Electrical System, Fuel System, Cooling System, Exhaust System, Frame, Bodywork, Controls, Wheels, Tires, Maintenance, Troubleshooting, Diagnostics, Wiring Diagrams, Specifications

Estimated Pages:

Varies by specific publication, typically 600-900 pages for a comprehensive Harley-Davidson service manual.

Type:

Factory Service Manual / Repair Manual

Language:

English

Format:

Likely PDF or printed manual, given the description.

📖 Manual Coverage

Engine:

Detailed information on the Twin Cam 103 engine, including disassembly, assembly, component inspection, and specifications.

Transmission Drivetrain:

Coverage of the 6-speed Cruise Drive transmission, primary drive, and final drive assembly.

Electrical System:

Comprehensive wiring diagrams, troubleshooting for lighting, ignition, starting, charging, and accessory systems.

Fuel System:

Details on fuel injection (EFI), fuel pump, injectors, and related components.

Brakes:

Front and rear brake system service, including hydraulic systems, calipers, rotors, and ABS (if equipped).

Suspension Steering:

Front fork and rear shock absorber service, steering head bearing maintenance, and alignment.

Maintenance:

Scheduled maintenance, oil changes, filter replacements, brake fluid service, tire pressure, and lubrication points.

Diagnostics Troubleshooting:

Systematic diagnostic procedures for common and uncommon issues, fault code interpretation.

Repair Rebuild:

Step-by-step instructions for component removal, disassembly, repair, assembly, and reinstallation for major vehicle systems.

Wiring Diagrams:

Detailed, high-quality wiring diagrams for accurate electrical system diagnosis and repair.

Depth:

Comprehensive, covering basic to advanced repairs and diagnostics, suitable for both DIY enthusiasts and professional mechanics.

📊 Manual Specifications

Format Detail:

If PDF, typically searchable text for ease of navigation and printing. High-resolution diagrams.

Diagram Quality:

Top quality diagrams and instructions as per product description, crucial for accurate repair work.

Binding:

If printed, typically spiral-bound or saddle-stitched for lay-flat usability in a workshop environment.

Paper Quality:

If printed, durable paper stock designed to withstand workshop conditions.

⚙️ Engine Specifications

Engine Type:

Air-cooled, Twin Cam 103B (rigidly mounted)

Displacement:

103 cu. in. (1690 cc)

Bore X Stroke:

3.875 in. x 4.38 in. (98.4 mm x 111.3 mm)

Compression Ratio:

9.0:1

Horsepower:

Approx. 70 HP @ 5000 RPM (rated by manufacturer, actual may vary)

Torque:

Approx. 98.9 ft-lbs @ 3500 RPM (rated by manufacturer, actual may vary)

Fuel Delivery:

Electronic Sequential Port Fuel Injection (ESPFI)

Fuel Type:

Unleaded gasoline

Oil Type Recommendation:

Harley-Davidson Genuine V-Twin 20W-50, or equivalent API SG, JASO FD/FE certified motorcycle oil.

Oil Capacity:

Approx. 4.0 US quarts (3.8 L) with filter change.

🔧 Transmission

Transmission Type:

6-Speed Cruise Drive

Primary Drive:

Plated, wet, multi-disc clutch; chain drive

Final Drive:

Belt drive, 32/66 ratio

Transmission Fluid Type:

Harley-Davidson Genuine Formula Transmission Lubricant, or equivalent SAE 80W-90.

Transmission Fluid Capacity:

Approx. 2.8 US quarts (2.6 L).

📐 Dimensions

Length:

Approx. 93.3 in. (2370 mm)

Width:

Approx. 39.4 in. (1000 mm)

Height:

Approx. 47.2 in. (1200 mm)

Front Tire:

130/90B16 67H

Rear Tire:

150/80B16 77H

Wheel Size:

16-inch front and rear

Dry Weight:

Approx. 705 lbs (320 kg)

Gross Vehicle Weight Rating:

Approx. 1160 lbs (526 kg)

Fuel Tank Capacity:

5.0 US gallons (18.9 L)

🛡️ Safety Features

Safety Features Availability:

ABS (Anti-lock Braking System) was often an optional feature for Harley-Davidson models of this era, including the Fat Boy. Check specific vehicle VIN for confirmation.

ABS:

Anti-lock Braking System (optional).

Lighting:

Halogen headlamp and LED tail light for visibility.

Frame Type:

Mild steel, tubular frame; 50 mm front fork; dual shocks with adjustable preload.

💡 Technology Features

Audio System:

The 2015 FLSTF Fat Boy typically does not come standard with an integrated infotainment system. Audio systems were often aftermarket additions.

ABS:

Available ABS enhances braking safety, particularly in adverse conditions.

Connectivity Features:

No built-in smartphone connectivity or advanced rider aids like GPS in standard configuration for this model year.

Diagnostic Tools:

The manual will likely cover procedures for using Harley-Davidson's proprietary diagnostic tools (like the Digital Technician) or explain fault codes accessible through the vehicle's diagnostic port.

🔧 Maintenance

First Service:

Typically at 1,000 miles (1,600 km) for initial break-in service (oil change, filter, inspection).

Regular Maintenance:

10,000-mile (16,000 km) or 12-month intervals for major service, including oil changes, filter replacements, inspection of all systems, and adjustments.

Brake Fluid Type:

DOT 4.

Primary Chain Case Fluid:

Harley-Davidson Genuine Formula Transmission Lubricant or equivalent SAE 80W-90.

Primary Chain Case Capacity:

Approx. 3.5 US pints (1.7 L).

Common Wear Items:

Clutch wear, brake pad wear, tire wear, belt tension and wear, suspension bushings, and electrical connections are common areas requiring regular inspection.

Potential Electrical:

While generally reliable, some older models can experience issues with battery charging systems, voltage regulators, or loose electrical connectors due to vibration.

Tasks:

Spark plug replacement, air filter cleaning/replacement, fuel filter replacement, clutch adjustment, brake bleeding, chain lubrication and adjustment (if applicable for pre-2015 models with chain drive).

📚 Vehicle History

Heritage:

Harley-Davidson boasts a rich history dating back to 1903, synonymous with American motorcycle culture and V-twin engines.

Fat Boy Origin:

The Fat Boy, introduced in 1990, quickly became an icon for its distinctive styling, including its solid disc wheels and fat tires. It has seen continuous evolution.

Model Platform:

Part of the Softail family, characterized by its hidden rear shock absorbers designed to mimic the look of a hardtail frame.

Key Updates:

The 2015 model continued the tradition with the Twin Cam 103 engine and the distinctive Fat Boy styling. Minor updates to electronics and comfort features are common year-over-year.

🏆 Awards & Recognition

Model Accolades:

The Fat Boy model has consistently been recognized for its iconic styling and American cruiser appeal by various motorcycle publications and enthusiast groups throughout its history.

Certification:

As a factory service manual, it adheres to Harley-Davidson's engineering and service standards.