🏷️ Basic Information

Make:

Harley-Davidson

Model:

FLSTFB Fat Boy Lo

Year:

2015

Model Code:

FLSTFB

Engine Family Code:

Revolution Max (typically Softail models of this era would use the Twin Cam 103, but verification is needed based on specific VIN and Harley's internal coding)

👋 Introduction

Positioning:

Cruiser motorcycle, known for its distinctive styling and powerful V-twin engine, targeting riders who appreciate classic design with modern performance.

Competitors:

Other Harley-Davidson Softail models, Indian Chief models, select American V-twin motorcycles from other manufacturers.

Model Features:

Low seat height, wide handlebars, classic Fat Boy styling cues, powerful V-twin engine, comfortable riding position.

Usefulness:

Provides essential, detailed information for owners and mechanics to perform maintenance, diagnostics, and repairs, ensuring optimal performance and longevity.

📋 Manual Details

Primary Coverage:

Service, Repair, Maintenance, Diagnostics, Troubleshooting

Secondary Coverage:

Component disassembly and assembly, adjustments, specifications, special tools

Total Pages:

626

Type:

Workshop Service Manual

Language:

English

File Format:

PDF

Download Availability:

Instant Download

📖 Manual Coverage

Engine:

Engine mechanical, fuel system, ignition system, lubrication system, cooling system (if applicable for the model variant)

Transmission Drivetrain:

Primary drive, transmission, clutch, final drive

Chassis Suspension:

Frame, front suspension (forks), rear suspension (shocks), wheels, tires, steering system

Brakes:

Brake system (front and rear), hydraulic systems, components

Electrical System:

Battery, charging system, starting system, lighting, ignition, instrumentation, wiring diagrams, sensors

Fuel System:

Fuel tank, fuel pump, fuel injectors, throttle body, EFI system

Exhaust System:

Exhaust pipes, mufflers, catalytic converter (if equipped)

Bodywork:

Body panels, fenders, seat, controls, fairings (if applicable)

Maintenance:

Scheduled maintenance, fluid changes, filter replacements, lubrication

Troubleshooting:

Diagnostic procedures, common issues and solutions, fault finding

Repair:

Detailed step-by-step repair instructions for all major components

Disassembly Assembly:

Complete procedures for removing and installing components

Adjustments:

Calibration and adjustment procedures for various systems (e.g., clutch, brakes, throttle)

Diagnostic Troubleshooting:

Diagnostic flowcharts, trouble codes, sensor testing

Depth:

Comprehensive, from basic maintenance to advanced engine and electrical system diagnostics and repair

Illustrations:

Pictorial diagrams, exploded views, photos, line drawings

Special Tools:

Identification and usage of required special service tools

Specifications:

Detailed service data, tightening torques, wear limits, measurement specifications

📊 Manual Specifications

PDF Quality:

High-resolution, printable pages

Searchability:

Likely text-searchable PDF (depending on OCR quality during creation)

Printability:

Yes, all pages are printable

Binding:

N/A (Digital Download)

Paper:

N/A (Digital Download)

Operating Systems:

Windows, Mac, Linux OS

Software Requirement:

Adobe Reader

⚙️ Engine Specifications

Engine Type:

Twin Cam 103 (likely, standard for FLSTFB models in this era)

Engine Configuration:

45-degree V-twin, air-cooled

Displacement:

1690 cc (103 cubic inches)

Bore X Stroke:

3.875 in. x 4.380 in. (98.4 mm x 111.3 mm)

Compression Ratio:

9.6:1

Torque Rating:

Approx. 100 ft-lbs @ 3,000 RPM (varies slightly by specific tune and year)

Fuel Delivery:

Electronic Sequential Port Fuel Injection (ESPFI)

Fuel Type:

Premium unleaded gasoline

🔧 Transmission

Transmission Type:

6-speed Cruise Drive

Clutch Type:

Cable-actuated, wet, multi-plate

Final Drive:

Belt drive

📐 Dimensions

Length:

Approx. 92.1 in. (2339 mm)

Width:

Approx. 35.7 in. (907 mm)

Height:

Approx. 44.5 in. (1130 mm)

Dry Weight:

Approx. 680 lbs (308 kg)

Gvwr:

Not explicitly stated, but typically around 1100-1200 lbs for this class of motorcycle

Fuel Capacity:

5.0 gallons (18.9 L)

🛡️ Safety Features

Crash Safety:

Motorcycle safety is primarily dependent on rider skill and adherence to safe riding practices. Specific crash ratings like automotive standards are not applicable.

Braking System:

Hydraulic disc brakes (dual front, single rear)

ABS:

Optional, check VIN or specific model configuration

Lighting:

Halogen headlamp, LED tail lamp and brake light, amber incandescent turn signals.

Tire Pressure Monitoring:

Not typically standard on this model year, check specific options.

💡 Technology Features

Audio System:

Optional Boom!™ Audio system may be available on some configurations, but basic models focus on the riding experience.

Cruise Control:

Often standard or an option on touring-oriented Softails like the Fat Boy Lo, check specific trim.

Diagnostics Interface:

The manual will detail diagnostic port locations and procedures for connecting diagnostic tools.

🔧 Maintenance

First Service:

Typically at 1,000 miles (1,600 km) or 6 months, whichever comes first.

Subsequent Service:

Generally every 5,000 miles (8,000 km) or 12 months for routine checks and fluid changes, with more detailed inspections at higher mileage intervals.

Engine Oil:

Harley-Davidson Genuine V-Twin 20W-50 Synthetic (or equivalent meeting Harley-Davidson specification H-D 360).

Transmission Primary Oil:

Harley-Davidson Genuine Formula + Transmission & Primary Chaincase Lubricant (or equivalent meeting Harley-Davidson specification H-D 360).

Brake Fluid:

DOT 4 (refer to specific sections for bleeding procedures and fluid type verification).

Fork Oil:

Harley-Davidson Genuine Fork Oil (viscosity varies based on specific fork type, consult manual for correct type and amount).

Common Problems:

While generally reliable, common areas for attention can include clutch adjustment, potential for minor oil leaks with age, and electrical connections. The manual addresses these and provides solutions.

Part Replacement:

Emphasis on using genuine Harley-Davidson parts or equivalent specified aftermarket parts to maintain performance and safety.

📚 Vehicle History

Brand Legacy:

Harley-Davidson is an iconic American motorcycle manufacturer with a rich history dating back to 1903, renowned for its V-twin engines and classic cruiser styling.

Fat Boy Lineage:

The Fat Boy model was introduced in 1990 and quickly became a cultural icon. The 'Lo' version, introduced later, offers a lower seat height and a more streamlined profile, fitting into the Softail family.

Manufacturing Location:

Primarily assembled in the United States (e.g., York, Pennsylvania, or Milwaukee, Wisconsin for final assembly).

Production Years:

The FLSTFB Fat Boy Lo was produced for several model years, including 2015.

🏆 Awards & Recognition

Model Acclaim:

The Fat Boy line has consistently received positive reviews for its iconic styling and comfortable ride. Specific awards for the 2015 FLSTFB would be noted in automotive press reviews of the time.