🏷️ Basic Information

Make:

Harley-Davidson

Model:

FLSTFI Fat Boy Softail

Year:

2006

Model Code:

FLSTFI

Family:

Softail

👋 Introduction

Positioning:

The Harley-Davidson FLSTFI Fat Boy Softail is a cruiser motorcycle known for its iconic styling, comfortable ride, and powerful V-twin engine. Positioned as a premium, stylish, and relatively accessible Harley-Davidson model within the Softail line, it appeals to riders who appreciate classic American motorcycle design and a relaxed cruising experience.

Competitors:

Competes with other cruiser motorcycles from brands like Indian, Victory (historically), and Japanese manufacturers offering similar styling and V-twin configurations (e.g., Yamaha V-Star, Honda Shadow, Kawasaki Vulcan).

Features:

Distinctive wide front fork, Fat Bob fuel tank, chrome accents, classic styling cues, comfortable riding position, powerful Twin Cam 88B engine (for 2006).

Value Proposition:

This comprehensive service manual is essential for owners and independent mechanics to perform maintenance, diagnostics, and repairs on the 2006 Harley-Davidson FLSTFI Fat Boy Softail. It provides the detailed technical information required to keep the motorcycle in optimal condition and address issues effectively, saving time and money compared to dealership service.

📋 Manual Details

Engine:

Yes

Transmission:

Yes

Drivetrain:

Yes

Chassis:

Yes

Electrical System:

Yes

Fuel System:

Yes

Ignition System:

Yes

Suspension:

Yes

Brakes:

Yes

Wheels And Tires:

Yes

Bodywork:

Yes

Lighting:

Yes

Instruments And Controls:

Yes

Maintenance Procedures:

Yes

Troubleshooting:

Yes

Wiring Diagrams:

Yes

Estimated Pages:

N/A (PDF format implies dynamic page count, but typically extensive for a full service manual)

Type:

Service Repair Manual / Workshop Manual

Language:

English

Format:

PDF

📖 Manual Coverage

Engine Management:

Fuel Injection (EFI), Ignition Timing, Idle Speed Control, Emissions Control

Powertrain:

V-Twin Engine Overhaul, Clutch, Primary Drive, Transmission Operation and Repair, Final Drive Belt

Frame And Suspension:

Frame Inspection, Front Fork Assembly, Rear Shock Absorbers, Swingarm Maintenance

Electrical And Ignition:

Battery, Charging System (Stator, Regulator/Rectifier), Starting System (Starter Motor, Solenoid), Lighting System (Headlight, Taillight, Turn Signals), Ignition System (Coils, Spark Plugs, Ignition Module), Instrumentation, Horn, Security System

Brakes And Wheels:

Hydraulic Brake System (Master Cylinders, Calipers, Lines, Fluid), Wheel Bearings, Tire Installation and Balancing, Wheel Removal/Installation

Fuel And Exhaust:

Fuel Tank, Fuel Pump, Fuel Filter, Injectors, Exhaust System Components

Routine Maintenance:

Oil Changes, Filter Replacements, Chain/Belt Adjustment and Lubrication, Tire Pressure Checks, Brake Pad Inspections

Diagnostic Procedures:

Troubleshooting Guides for Common Issues, Electrical System Diagnostics, Engine Performance Analysis

Repair And Overhaul:

Engine Rebuild Procedures, Transmission Overhaul, Fork Seal Replacement, Brake Caliper Rebuild

Component Replacement:

Battery Replacement, Spark Plug Replacement, Air Filter Replacement, Belt Replacement, Clutch Adjustment

Electrical Repairs:

Wiring Harness Repair, Sensor Replacement, Module Diagnostics, Lighting Component Replacement

Depth:

Comprehensive. Covers from basic maintenance and checks to complete engine, transmission, and electrical system overhauls. Includes detailed diagnostic procedures and specifications for professional technicians.

📊 Manual Specifications

Quality:

High Resolution, Searchable Text (typical for professional PDF manuals)

Searchable:

Yes

Printable:

Yes

Binding:

N/A (Digital PDF)

Paper:

N/A (Digital PDF)

⚙️ Engine Specifications

Engine Type:

Air-cooled, Twin Cam 88B V-twin

Displacement:

1450 cc (88 cubic inches)

Bore X Stroke:

3.75 in. x 4.00 in. (95.25 mm x 101.6 mm)

Compression Ratio:

8.8:1

Valve Train:

Overhead valves (OHV), 2 valves per cylinder

Cooling System:

Air-cooled

Induction Type:

Electronic Sequential Port Fuel Injection (ESPFI)

Ignition System:

Single fire, non- மாறுதல், electronic ignition

Horsepower Estimated:

Approximately 65-70 HP (claimed flywheel, actual wheel HP lower)

Torque Estimated:

Approximately 78-85 ft-lbs @ 3500 RPM (claimed flywheel)

Fuel Type:

Unleaded gasoline, minimum 91 octane

Fuel Tank Capacity:

4.8 US gallons (18.2 L)

🔧 Transmission

Transmission Type:

5-speed Constant Mesh, Traxial Input-Output

Primary Drive:

Duplex chain, 34/46 ratio

Final Drive:

Belt, 32/65 ratio

Clutch Type:

9-plate, wet, non-asbestos, compensated

Transmission Fluid Type:

Harley-Davidson Formula + Transmission/Primary Chaincase Lubricant

Transmission Fluid Capacity:

26 US fl oz (0.77 L)

📐 Dimensions

Length Overall:

93.2 inches (2367 mm)

Width Handlebars:

37.0 inches (940 mm)

Height Overall:

49.2 inches (1250 mm)

Wheelbase:

63.4 inches (1610 mm)

Ground Clearance:

4.7 inches (119 mm)

Seat Height Laden:

26.5 inches (673 mm)

Dry Weight Estimated:

651 lbs (295 kg)

Gross Vehicle Weight Rating:

1070 lbs (485 kg)

Front Tire Size:

130/90B16 67H

Rear Tire Size:

150/80B16 77H

Wheel Type:

Cast aluminum, laced spokes (standard)

Wheel Bolt Pattern:

N/A (Solid axle mounts)

🛡️ Safety Features

Crash Test Ratings:

N/A (Motorcycles are not subjected to standardized crash tests like passenger cars.)

Braking System:

Dual-piston caliper front and rear hydraulic disc brakes. Single 292mm (11.5 inch) disc front, Single 292mm (11.5 inch) disc rear.

Lighting:

Halogen headlight, LED taillight, incandescent turn signals.

Security:

Factory-installed H-D Smart Security System (optional/standard depending on specific sub-model/market).

💡 Technology Features

Infotainment System:

Basic instrumentation cluster including speedometer, tachometer (on some models/accessories), odometer, trip odometer, fuel gauge, and indicator lights. No integrated infotainment system as found on modern motorcycles.

Driver Assistance:

N/A. No electronic driver assistance systems.

Connectivity:

N/A. No Bluetooth or smartphone connectivity.

Fuel Injection:

Electronic Sequential Port Fuel Injection (ESPFI) for improved throttle response, fuel economy, and emissions.

Ignition:

Solid-state electronic ignition with knock sensor for optimal timing.

🔧 Maintenance

First Service:

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

Subsequent Oil Change:

Every 5,000 miles (8,000 km) or 12 months

Primary Chaincase Inspection:

Every 10,000 miles (16,000 km)

Rear Drive Belt Inspection:

Every 5,000 miles (8,000 km)

Spark Plug Replacement:

Every 10,000 miles (16,000 km)

Brake Fluid Flush:

Every 24 months (regardless of mileage)

Engine Oil Type:

Harley-Davidson SYN3 (Synthetic) SAE 20W-50 or equivalent motorcycle-specific oil meeting Harley-Davidson P/N 99824-00.

Engine Oil Capacity:

3.5 US quarts (3.3 Liters) with filter change.

Primary Chaincase Fluid Type:

Harley-Davidson Formula + Transmission/Primary Chaincase Lubricant

Primary Chaincase Fluid Capacity:

26 US fl oz (0.77 L)

Brake Fluid Type:

DOT 4 Hydraulic Fluid

Common Problems:

Some Twin Cam engines of this era can experience cam chain tensioner wear, leading to noise and potential damage if not addressed. Leaking primary or transmission seals are also possible. Fueling can be sensitive to modifications. Exhaust pipe or header leaks can occur.

Typical Repairs:

Cam chain tensioner replacement (often with upgraded hydraulic tensioners), seal replacements, clutch adjustments, exhaust system gasket replacement.

📚 Vehicle History

Heritage:

Harley-Davidson is an iconic American motorcycle manufacturer with a history dating back to 1903. Known for its V-twin engines, distinctive styling, and a strong rider community.

Evolution:

The Softail platform, characterized by its hidden rear shock absorbers mimicking a hardtail look, was introduced in 1983. The Fat Boy model, with its distinctive wide front tire and fork, was introduced in 1990, becoming an instant classic and a symbol of Harley-Davidson's cruiser lineup. The FLSTFI is part of the evolution towards fuel injection and the Twin Cam engine.

Manufacturing Location:

United States (primarily York, Pennsylvania; Milwaukee, Wisconsin)

Production Years Fat Boy:

1990-Present (various iterations and engine configurations)

🏆 Awards & Recognition

Recognition:

The Fat Boy model, in general, has received numerous accolades for its styling and cultural impact, including its prominent role in films like 'Terminator 2: Judgment Day', solidifying its status as a motorcycle icon. Specific awards for the 2006 model year are not typically highlighted separately from the model's overall legacy.