🏷️ Basic Information

Make:

Harley-Davidson

Model:

FLHTCUI Ultra Classic Electra Glide

Year:

2006

Type:

Motorcycle

Model Code:

FLHTCUI

👋 Introduction

Segment:

Flagship full-dress touring motorcycle segment.

Target Audience:

Long-distance touring riders seeking comfort, features, and iconic Harley-Davidson styling.

Competitors:

Other premium touring motorcycles from brands like Honda (Gold Wing), Indian (Roadmaster), and potentially BMW.

Touring Amenities:

Full fairings with windscreen, integrated saddlebags, tour-pak with passenger backrest, cruise control, advanced audio system, and comfortable rider/passenger seating.

Powertrain:

Harley-Davidson's renowned V-twin engine, offering characteristic torque and sound.

📋 Manual Details

Coverage:

Complete factory service, repair, and workshop procedures

Page Count:

Estimated 600-800 pages (typical for this model/year service manual)

Manual Type:

Service Repair Workshop Manual

Language:

English

Format:

PDF (Downloadable)

📖 Manual Coverage

Engine:

Detailed inspection, repair, and overhaul of the Twin Cam 1450 engine, including components like cylinders, pistons, crankshaft, camshafts, valves, and cooling systems.

Fuel System:

Fuel injection system (EFI), fuel pump, injectors, throttle body, sensors (e.g., MAP, IAT, O2), fuel tank, and lines.

Ignition System:

Ignition module, spark plugs, ignition coils, and related wiring.

Transmission:

Service and repair of the 5-speed Cruise Drive transmission, including clutch, gears, bearings, seals, and shift mechanisms.

Drivetrain:

Primary drive system, clutch assembly, belt drive, and rear final drive components.

Electrical System:

Comprehensive coverage of the motorcycle's electrical system, including battery, charging system (stator, regulator/rectifier), lighting (headlight, taillight, turn signals), starter motor, horn, and instrumentation.

Chassis:

Frame, front fork, steering assembly, rear suspension (shocks), swingarm, and wheel bearings.

Braking System:

Front and rear brake systems, including master cylinders, calipers, brake pads, rotors, brake lines, and hydraulic fluid specifications.

Wheel Tires:

Wheel inspection, tire maintenance, and replacement procedures, including wheel balance and torque specifications.

Bodywork Fairings:

Installation, removal, and repair of fairings, saddlebags, tour-pak, seat, and other body components.

Comfort Convenience:

Cruise control system, audio system, CB radio, intercom, climate controls, and associated electrical components.

Diagnostic Troubleshooting:

Systematic troubleshooting guides, diagnostic charts, and fault code interpretation for various systems.

Routine Maintenance:

Oil changes, filter replacements, spark plug service, chain/belt adjustments, brake fluid flushes, and coolant checks.

Engine Repair:

Complete engine rebuilds, top-end and bottom-end overhauls, valve adjustments, and component replacement.

Transmission Repair:

Clutch service, gear replacement, bearing renewal, and transmission fluid changes.

Electrical Diagnostics:

Troubleshooting electrical faults, testing charging system components, and repairing wiring harnesses.

Brake Service:

Brake pad replacement, caliper service, bleeding the brake system, and master cylinder overhaul.

Suspension Service:

Front fork oil changes and seal replacement, rear shock absorber inspection and replacement.

Bodywork Installation:

Removal and installation of fairings, saddlebags, tour-pak, and other cosmetic components.

Troubleshooting Guides:

Step-by-step diagnostic procedures for common and uncommon problems.

Wiring Diagrams:

Detailed electrical wiring diagrams for all systems.

Depth:

Comprehensive, from basic maintenance to full engine and transmission rebuilds.

Diagnostic Level:

Advanced diagnostic procedures, including sensor data interpretation and troubleshooting electrical circuits.

Rebuild Procedures:

Detailed instructions for complete disassembly and reassembly of major components.

Torque Specifications:

All critical torque values for fasteners and components.

Special Tools:

Identification and usage of specialized tools required for specific repairs.

📊 Manual Specifications

File Type:

Portable Document Format (PDF)

Searchability:

Likely text-searchable if created from original digital source, allowing quick access to information.

Image Resolution:

High resolution for clear diagrams, illustrations, and text (assumed for factory manual).

Binding:

N/A (Digital PDF format)

Paper Quality:

N/A (Digital PDF format)

⚙️ Engine Specifications

Engine Type:

Harley-Davidson Twin Cam 1450 (Evolution)

Displacement:

1450 cc (88 cubic inches)

Configuration:

Air-cooled, 45-degree V-twin

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), pushrod actuated, 2 valves per cylinder

Horsepower:

Approx. 67 HP @ 5200 RPM (estimated, may vary slightly)

Torque:

Approx. 86 ft-lbs @ 3500 RPM (estimated, may vary slightly)

Fuel Delivery:

Electronic Sequential Port Fuel Injection (ESPFI)

Fuel Type:

Unleaded gasoline, 91 octane (R+M)/2 or higher recommended

Engine Oil Capacity:

4.0 US quarts (3.8 L) with filter change

Engine Oil Recommendation:

Harley-Davidson Genuine Motor Oil SAE 20W50 or equivalent API SG, SJ, SL, or higher, JASO FD, FE certified

🔧 Transmission

Transmission Type:

5-speed constant mesh

Clutch Type:

Cable-operated, wet, multi-plate

Final Drive:

Belt drive

Gear Ratios:

First: 10.063, Second: 6.860, Third: 4.954, Fourth: 3.711, Fifth: 3.154 (Typical ratios, verify with manual)

Transmission Oil Type:

Harley-Davidson Formula + Transmission & Primary Chaincase Lubricant (or equivalent SAE 80W-90 GL-5)

Transmission Oil Capacity:

24 US fluid ounces (0.71 L)

📐 Dimensions

Length:

95.2 in (2418 mm)

Width:

37.0 in (940 mm)

Height:

63.5 in (1613 mm)

Wheelbase:

63.2 in (1605 mm)

Ground Clearance:

5.1 in (130 mm)

Dry Weight:

816 lbs (370 kg) (approximate)

Wet Weight:

858 lbs (389 kg) (approximate, with fluids)

Gross Vehicle Weight Rating Gvwr:

1360 lbs (617 kg)

Saddlebag Capacity:

Approx. 2.25 cu ft total

Tour Pak Capacity:

Approx. 3.0 cu ft (with backrest)

🛡️ Safety Features

Crash Test Ratings:

N/A (Motorcycles are not typically subjected to automotive crash test ratings)

Braking:

Dual 32mm, 4-piston calipers, 11.5 in (292 mm) floating rotor (front and rear)

Cruise Control:

Electronic cruise control

Lighting:

Halogen headlight, integrated front and rear lighting with reflectors.

Operator Aid:

Anti-lock Braking System (ABS) - Standard on FLHTCUI model

💡 Technology Features

Audio System:

Harley-Davidson Classic Radio with CB/Intercom, AM/FM stereo, cassette player, and weather band. Likely features handlebar-mounted controls.

Display:

Analog gauges for speedometer, tachometer, fuel level, oil pressure, voltmeter, and engine temperature. LCD display for odometer, trip meters, and gear indicator.

ABS:

Standard Anti-lock Braking System (ABS) for enhanced stopping control.

Cruise Control:

Factory-installed electronic cruise control for relaxed highway riding.

Cb Intercom:

Integrated Citizens Band (CB) radio and rider-to-passenger intercom system.

🔧 Maintenance

First Service:

1000 miles (1600 km) or 6 months, whichever comes first. Includes oil and filter change, primary chaincase oil change, inspection of critical fasteners, and clutch/throttle cable adjustments.

Subsequent Oil Change:

Every 5000 miles (8000 km) or 12 months, whichever comes first.

Spark Plug Replacement:

Recommended every 10,000 - 15,000 miles (16,000 - 24,000 km), depending on plug type and operating conditions.

Brake Fluid Flush:

Recommended every 24 months, regardless of mileage, due to moisture absorption.

Primary Chaincase Oil:

Harley-Davidson Formula + Transmission & Primary Chaincase Lubricant or equivalent SAE 80W-90 GL-5

Brake Fluid:

DOT 4 brake fluid (check manual for specific Harley-Davidson P/N recommendation)

Fork Oil:

Refer to manual for specific weight and type; often Harley-Davidson's 10W fork oil.

Cam Chain Tensioners:

Early Twin Cam models (pre-2007) can experience wear on the hydraulic cam chain tensioners. Replacement with improved hydraulic tensioners or the conversion to the '07-style gear drive cam is a common upgrade.

Crankshaft Position Sensor:

Failure of the crankshaft position sensor can lead to starting problems or engine stalling.

Regulator Rectifier:

The regulator/rectifier unit is a known failure point in many Harley-Davidson models of this era, leading to charging system issues.

Oil Leaks:

Potential for oil leaks from primary cover, engine case joints, or rocker boxes due to aging gaskets and seals.

📚 Vehicle History

Brand Legacy:

Harley-Davidson, founded in 1903, is an iconic American motorcycle manufacturer known for its V-twin engines and cruiser/touring motorcycles.

Electra Glide Lineage:

The Electra Glide is Harley-Davidson's premier touring model, with roots dating back to the 1960s. The FLHTCUI designation signifies the top-tier, fully-equipped Ultra Classic model.

Twin Cam Introduction:

The Twin Cam engine platform was introduced in 1999, evolving over the years to offer increased displacement and performance. The 1450cc (88ci) engine was the standard for many models, including this 2006 Ultra Classic.

Manufacturing Location:

York, Pennsylvania, USA (Primary assembly)

Model Year Significance:

2006 marked a period of refinement for the Twin Cam platform, with the Ultra Classic offering a comprehensive touring package for its era.

🏆 Awards & Recognition

Model Awards:

While specific 'awards' are less common for individual model years of motorcycles compared to cars, the Electra Glide line has consistently been recognized as a benchmark in the touring motorcycle segment for its comfort and feature set.

Industry Recognition:

Often cited in motorcycle publications for its touring capabilities and long-distance comfort.

Emissions Compliance:

Meets applicable EPA and California ARB emissions standards for motorcycles.