🏷️ Basic Information

Make:

Harley-Davidson

Model:

Softail FLSTF Fat Boy

Model Designation:

FLSTF

Year:

2015

Variant:

Fat Boy

Platform Code:

BX

👋 Introduction

Market Segment:

Cruiser Motorcycle, Iconic American Styling

Key Competitors:

Other Harley-Davidson Softail models, Indian Chief models, select Japanese cruisers

Model Identity:

Renowned for its distinctive wide front tire, chrome accents, and classic Harley-Davidson cruiser aesthetics

Manual Purpose:

To provide owners and technicians with the authoritative information needed for accurate maintenance and repair, ensuring optimal performance and longevity of the 2015 Softail Fat Boy.

📋 Manual Details

Primary Coverage:

Service, Maintenance, Repair

Estimated Page Count:

High (typically 500+ pages for comprehensive H-D manuals)

Manual Type:

Service and Repair Manual

Language:

English

Format:

Digital (likely PDF, given common industry practices for this type of manual)

📖 Manual Coverage

Engine:

Full overhaul, diagnostics, tuning, specific component repair (e.g., cylinders, pistons, crankshaft, camshafts, valve train)

Fuel System:

Fuel injection system (EFI), throttle body, injectors, fuel pump, fuel lines, pressure testing

Ignition System:

Ignition modules, spark plugs, wiring, coil diagnostics

Transmission:

Clutch operation, primary drive, transmission case, gears, shift mechanisms, lubrication

Drivetrain:

Final drive belt inspection, tensioning, replacement; rear wheel axle and bearings

Brakes:

Front and rear brake systems, hydraulic lines, master cylinders, calipers, rotors, bleeding procedures

Suspension:

Front fork (telescopic), rear shock absorbers, service, adjustment, and replacement

Electrical System:

Battery, charging system (alternator, regulator), lighting, starter motor, wiring diagrams, diagnostic codes (DTCs)

Chassis And Frame:

Frame inspection, swingarm, steering head bearings, wheel bearings

Bodywork And Trim:

Fenders, fuel tank, seat, handlebars, controls, cosmetic components

Wheels And Tires:

Wheel removal and installation, tire inspection, replacement, and pressure

Maintenance Tasks:

Oil changes, filter replacements, spark plug service, air filter cleaning/replacement, brake fluid flush, belt inspection and adjustment

Troubleshooting:

System-specific diagnostic procedures, common fault identification and rectification, symptom-based troubleshooting guides

Repair Procedures:

Step-by-step instructions for component removal, overhaul, repair, and reassembly

Specifications And Tolerances:

Torque values, clearances, fluid capacities, diagnostic parameters

Wiring Diagrams:

Detailed electrical schematics for all systems

Depth Of Coverage:

Comprehensive: Covers basic maintenance to complete engine rebuilds and complex electrical diagnostics

📊 Manual Specifications

Digital File Type:

PDF (Portable Document Format)

Digital Quality:

High-resolution scans/digital creation for clear text and diagrams

Binding:

N/A (Digital Format)

Paper Quality:

N/A (Digital Format)

Text Searchability:

Likely searchable text for quick information retrieval

⚙️ Engine Specifications

Engine Type:

Air-cooled, Twin Cam 103B™

Displacement:

1690 cc (103 cubic inches)

Bore X Stroke:

3.875 in. x 4.375 in. (98.4 mm x 111.1 mm)

Compression Ratio:

9.0:1

Torque Peak:

Approx. 99 ft-lbs @ 3,250 RPM (134 Nm @ 3250 rpm)

Horsepower Estimate:

Typically in the range of 75-80 HP (Actual figures vary, manual will have precise dynamometer data if available).

Fuel Delivery:

Electronic Sequential Port Fuel Injection (ESPFI)

Fuel Type:

Premium unleaded gasoline, minimum 91 octane

Oil Type:

Harley-Davidson Genuine V-Twin 20W-50 Synthetic (or equivalent meeting Harley-Davidson specification)

Oil Capacity:

4.2 US qt (4.0 L) with filter change

🔧 Transmission

Type:

6-speed Cruise Drive®

Clutch Type:

Hydraulically actuated, multiplate wet clutch

Primary Drive:

Plated, heavy-duty, and offset chain

Final Drive:

Belt, 25mm wide, 140-tooth, 51T/70T sprockets

Transmission Oil Type:

Harley-Davidson Formula + Transmission & Primary Chaincase Lubricant (or equivalent meeting Harley-Davidson specification)

Transmission Oil Capacity:

1.0 US qt (0.95 L)

📐 Dimensions

Length:

96.1 in. (2441 mm)

Seat Height Laden:

26.2 in. (665 mm)

Ground Clearance:

4.7 in. (119 mm)

Dry Weight:

670 lbs. (304 kg)

Weight In Running Order:

705 lbs. (320 kg)

Gross Vehicle Weight Rating Gvwr:

1,160 lbs. (526 kg)

Fuel Capacity:

5.0 US gal. (18.9 L)

🛡️ Safety Features

Safety Certifications:

DOT, EPA, CARB (as applicable to motorcycle safety and emissions standards)

Braking System:

Hydraulic disc brakes, front and rear. Standard ABS (Anti-lock Braking System) was often optional or standard depending on specific build date and market for 2015 models. Manual will clarify.

Lighting:

Halogen headlamp, LED tail lamp, front and rear turn signals

💡 Technology Features

Audio System:

Base models typically do not feature integrated audio systems. Accessories might be available, and the manual would cover installation if applicable.

ABS:

Anti-lock Braking System (ABS) available, check specific bike configuration. Manual details its operation and diagnostics.

Diagnostics:

On-board diagnostics with diagnostic trouble codes (DTCs) accessible via the diagnostic port (often requiring specific Harley-Davidson diagnostic tools for full interpretation, though manual may list basic code meanings).

🔧 Maintenance

Initial Service:

1,000 miles (1,600 km) or 6 months

Subsequent Service:

Every 5,000 miles (8,000 km) or 12 months, whichever comes first. (Note: Manual will detail specific interval checks like oil changes, belt inspection, brake fluid.)

Primary Chaincase Lubricant:

Harley-Davidson Formula + Transmission & Primary Chaincase Lubricant or equivalent

Engine Oil:

Harley-Davidson Genuine V-Twin 20W-50 Synthetic or equivalent

Brake Fluid:

DOT 4 (refer to manual for specific Harley-Davidson approved P/N)

Fork Oil:

Viscosity and quantity specified in manual, often a specific grade of suspension fluid

Common Wear Items:

Clutch plates, brake pads, drive belt, wheel bearings, fork seals (typical for any motorcycle, manual will provide specific wear limits)

Potential Twin Cam Considerations:

While the Twin Cam 103 is robust, the manual will cover checks for compensator sprocket wear, cam chain tensioners, and potential oil leaks typical for this engine family.

📚 Vehicle History

Brand Legacy:

Harley-Davidson, founded in 1903, is an iconic American motorcycle manufacturer with a rich heritage in cruiser and touring motorcycle design.

Fat Boy Introduction:

The Fat Boy model, first introduced in 1990, is recognized for its styling cues from the pre-WWII Harley-Davidson designs, notably the FLs of the 1940s.

Production Period:

The 2015 model year represents a continuation of the Softail platform, featuring the Twin Cam 103 engine, a popular and refined powerplant for Harley-Davidson.

🏆 Awards & Recognition

Model Recognition:

The Harley-Davidson Fat Boy has consistently received acclaim for its iconic design and its representation of American motorcycle culture. Specific awards for the 2015 model year are often market-dependent and related to consumer reviews and motorcycle publications.