🏷️ Basic Information

Make:

Harley-Davidson

Model:

FLHX Street Glide, FLHT Electra Glide Standard, FLHTCU Electra Glide Ultra Classic, FLHTI Electra Glide Standard EFI, FLHTC Electra Glide Classic, FLHTCI Electra Glide Classic EFI, FLHTCU Electra Glide Ultra Classic EFI, FLHR Road King, FLHRI Road King EFI, FLHRCI Road King Classic EFI, FLTR Road Glide, FLTRI Road Glide EFI

Year:

2006

Engine Variants:

Twin Cam 88 (1450cc) and potentially Twin Cam 96 (1584cc) depending on specific sub-model or build date.

Chassis Code:

FLT

👋 Introduction

Market Segment:

Harley-Davidson's touring and cruiser motorcycles, representing a premium segment of the V-twin motorcycle market.

Target Audience:

Owners of 2006 Harley-Davidson touring motorcycles seeking to perform their own maintenance and repairs, independent repair shops, and enthusiasts.

Key Competitors:

Indian Motorcycle (older models), Honda Gold Wing, Yamaha Star series, Kawasaki Vulcan series, Suzuki Boulevard series (though V-twin character is unique to Harley).

Vehicle Features:

Large displacement V-twin engines, comfortable riding ergonomics, extensive touring capabilities (fairings, saddlebags, optional Tour-Pak), iconic styling, extensive customization potential.

Engine Characteristic:

Torquey V-twin character with a distinctive exhaust note, designed for comfortable long-distance touring.

📋 Manual Details

Model Coverage:

All specified 2006 Harley-Davidson FLT-series models (FLHX, FLHT, FLHR, FLTR and their variants).

Repair Scope:

Covers all repairs from basic maintenance to complete engine and transmission overhauls, electrical system diagnostics, and bodywork repair.

Estimated Page Count:

Approximately 800-1200 pages (typical for comprehensive Harley-Davidson service manuals of this era, exact count not specified).

Manual Type:

Workshop Service and Repair Manual

Purpose:

Designed for technicians and experienced DIY mechanics for in-depth repair and maintenance.

Language:

English

Format:

Printable, likely a digital format such as PDF for printing.

📖 Manual Coverage

Mechanical Systems:

Engine (including Twin Cam 88 and 96 variations), Fuel System (carbureted and EFI), Ignition System, Clutch, Transmission (5-speed Cruise Drive), Final Drive, Suspension (forks, shocks), Brakes (front and rear), Wheels and Tires, Chassis, Frame, Bodywork (fairings, saddlebags, tour-pak).

Electrical Systems:

Wiring Diagrams, Lighting (headlight, taillight, signals), Instrumentation, Battery, Charging System (stator, regulator/rectifier), Starting System (starter, solenoid), Ignition Control Module (ICM), Fuel Injection Control Module (FICM), Audio Systems, Cruise Control, Anti-lock Braking System (ABS) where applicable.

Fuel System Efi:

Detailed diagnostics for the Electronic Fuel Injection system, including throttle body, fuel injectors, fuel pump, pressure regulator, Manifold Absolute Pressure (MAP) sensor, Intake Air Temperature (IAT) sensor, and Electronic Control Module (ECM).

Ignition System:

Diagnosis and repair of the ignition module, coil, spark plugs, and related sensors.

Chassis And Frame:

Frame inspection and repair, steering head bearing service, swingarm and pivot bearing service, rear shock absorber replacement, fork seal replacement and fork fluid service.

Bodywork And Trim:

Removal and installation of fairings, saddlebags, tour-pak, fenders, seat, fuel tank, and other body components, including hardware and mounting details.

Exhaust System:

Inspection, repair, and replacement of exhaust pipes, mufflers, and mounting hardware. Troubleshooting exhaust leaks.

Maintenance Procedures:

Scheduled maintenance intervals, oil changes, filter replacements (oil, air, fuel), spark plug replacement, brake fluid flush, clutch adjustment, lubrication points, battery maintenance, tire pressure checks, wheel balancing.

Repair Procedures:

Engine overhaul (top and bottom end), transmission rebuild, carburetor tuning/rebuild, fuel injection system diagnostics and repair, clutch replacement, brake caliper overhaul, suspension component replacement, wiring harness repair, body panel removal and installation, diagnostic trouble code (DTC) interpretation and troubleshooting.

Troubleshooting Guides:

Comprehensive guides to diagnose and resolve common and uncommon mechanical and electrical faults, including symptom charts and step-by-step resolution procedures.

Electrical Diagnostics:

Detailed wiring diagrams for all systems, troubleshooting procedures for battery, charging, starting, ignition, lighting, and accessories.

Wheel And Tire Service:

Wheel bearing replacement, tire mounting and balancing, spoke wheel maintenance (if applicable), wheel truing.

Engine Tuning:

Carburetor adjustment and rebuilding, fuel injection system adjustment (EFI), idle speed control, basic engine timing checks.

Diagnostic Capabilities:

Advanced diagnostics, troubleshooting guides, symptom-based fault finding, electrical system testing using multimeters and oscilloscopes, specific procedures for EFI system diagnostics, torque specifications for all fasteners, timing procedures, valve adjustments, compression testing.

Rebuild Instructions:

Complete engine teardown and reassembly instructions, transmission gear inspection and replacement, detailed procedures for rebuilding major components like the carburetor, fuel injectors, and brake calipers.

Special Tools:

Identification and usage instructions for specialized Harley-Davidson tools required for various procedures (e.g., bearing pullers, engine alignment tools, specific torque wrenches).

Torque Specifications:

Comprehensive listing of all critical torque specifications for engine, transmission, chassis, and braking components.

📊 Manual Specifications

Digital Format:

Likely PDF, enabling searchability and selective printing.

Searchability:

Likely searchable text within a PDF format, allowing quick access to specific topics or parts.

Image Quality:

High-quality with detailed pictures and diagrams crucial for accurate repairs and understanding of complex systems.

Binding Type:

If printed, typically a durable comb or coil binding for lay-flat usability in a workshop environment. If digital, not applicable.

Paper Type:

If printed, typically on a heavier, glossier paper stock resistant to workshop grime.

⚙️ Engine Specifications

Engine Type:

Air-cooled, 45-degree V-twin, pushrod actuated OHV, 4 valves per cylinder (2 per head).

Engine Displacement:

Primarily 1450cc (88 cubic inches) Twin Cam 88, with potential for the newer 1584cc (96 cubic inches) Twin Cam 96 in some later 2006 models or as a factory option.

Horsepower:

Approximately 65-70 HP (estimated, varies by specific model and tune).

Torque:

Approximately 85-90 lb-ft @ 3000-3500 RPM (estimated, varies by specific model and tune).

Bore X Stroke:

Twin Cam 88: 3.75 in x 4.00 in (95.25 mm x 101.6 mm). Twin Cam 96: 3.75 in x 4.38 in (95.25 mm x 111.25 mm).

Fuel Delivery:

Keihin CV Carburetor (36mm or 40mm) for carbureted models, or Electronic Sequential Port Fuel Injection (ESPFI) for EFI models.

Engine Cooling:

Air-cooled

Valvetrain:

Overhead Valve (OHV), pushrod actuated

🔧 Transmission

Transmission Type:

5-speed Manual Constant Mesh (Cruise Drive)

Transmission Options:

None standard; primarily manual transmission. Automatic transmissions were not common on these models.

Clutch Type:

Wet, multi-plate

Transmission Drive:

Belt drive (final)

📐 Dimensions

Wheelbase:

Approx. 63.5 - 64.5 inches (1613 - 1638 mm), varies by model.

Length:

Approx. 94 - 98 inches (2388 - 2489 mm), varies by model.

Ground Clearance:

Approx. 5.0 inches (127 mm).

Dry Weight:

Approx. 700 - 750 lbs (317 - 340 kg), varies significantly by model (e.g., FLHR lighter than FLHTCUI).

Gross Vehicle Weight Rating:

Typically around 1260 lbs (571 kg).

🛡️ Safety Features

Safety Certification:

Not typically rated by NHTSA or Euro NCAP in the same way as automobiles. Compliance with relevant motorcycle safety standards is expected.

Braking System:

Dual 32mm piston calipers with dual 11.5" (292mm) discs (front), Single 32mm piston caliper with single 11.5" (292mm) disc (rear). Optional ABS available on some models.

Tire Specifications:

Front: 130/90-16, Rear: 150/80-16 (typical, varies slightly by model).

Lighting:

Halogen headlight, auxiliary driving lights (on some models), LED taillight and brake light, front and rear turn signals.

💡 Technology Features

Audio System:

Optional AM/FM/WB stereo with cassette or CD player integrated into the fairing. May include CB/Intercom features on Ultra Classic models.

Cruise Control:

Electronic cruise control standard on many touring models (FLHTCI, FLHTCU, FLHRCI, FLTRI etc.), optional on others. Operated via handlebar controls.

Diagnostic Ports:

Proprietary diagnostic connectors for use with Harley-Davidson diagnostic tools (e.g., Digital Technician). These are crucial for EFI and ignition system diagnostics.

🔧 Maintenance

Oil Change Interval:

Every 5,000 miles (8,000 km) or 12 months, whichever comes first, for the engine oil.

Primary Chain Case Service:

Inspect primary chain tension at 10,000 miles (16,000 km), service as needed.

Transmission Oil Change:

Every 10,000 miles (16,000 km) or 24 months, whichever comes first.

Brake Fluid Flush Interval:

Every 2 years or as specified by fluid condition.

Engine Oil Type:

Harley-Davidson SYN3 (Synthetic 3) SAE 20W-50, or equivalent API CI-4 or higher, JASO MA certified motorcycle oil meeting Harley-Davidson specifications. Check manual for precise grade based on ambient temperature.

Transmission Fluid Type:

Harley-Davidson Formula + Transmission & Primary Chain Case Lube, or equivalent SAE 80W-90 hypoid gear oil meeting Harley-Davidson specifications. (Note: Primary and Transmission share a common fluid on some older models, but 2006 often has separate fill points for transmission vs. primary.) This manual likely covers both configurations.

Brake Fluid Type:

DOT 4 Heavy Duty Brake Fluid.

Engine Oil Capacity:

Approximately 4.0 US quarts (3.8 L) with filter change. Consult manual for precise capacity.

Transmission Oil Capacity:

Approximately 1.0 US quart (0.95 L). Consult manual for precise capacity.

Primary Chain Case Oil Capacity:

Approximately 2.8 US quarts (2.65 L) for the primary, which also lubricates the clutch and transmission on some configurations. Consult manual for precise capacity and separate fill points if applicable.

Common Problems:

Cam chain tensioner wear (especially early Twin Cam 88), stator failure (leading to charging issues), regulator/rectifier failure, oil leaks (especially from crankcase seals), exhaust leaks, early EFI fuel pump issues, some transmission bearing issues.

Common Wear Items:

Clutch plates, brake pads, tires, fork seals, battery, drive belt.

📚 Vehicle History

Heritage Notes:

Harley-Davidson, founded in 1903, is an iconic American motorcycle manufacturer renowned for its V-twin engines and distinctive styling, particularly in the cruiser and touring segments.

Twin Cam Era:

The 2006 models represent the continuation of the Twin Cam engine platform, which debuted in 1999. These touring models are descendants of the original Electra Glide and Road King lineage, evolving with fuel injection and updated chassis components.

Manufacturing Location:

United States (primarily York, Pennsylvania; Milwaukee, Wisconsin for some engine components).