🏷️ Basic Information

Make:

Harley-Davidson

Model:

Softail FLHTCUI Ultra Classic Electra Glide

Year:

2006

Model Code:

FLHTCUI

Platform:

Softail

👋 Introduction

Positioning:

Flagship touring motorcycle, designed for long-distance comfort and carrying capacity, appealing to riders seeking a premium Harley-Davidson experience.

Competitors:

Primarily competes with other large displacement V-twin touring motorcycles from manufacturers like Indian Motorcycle (Chief Vintage, Roadmaster) and select Japanese brands offering touring variants (e.g., Honda Gold Wing, although in a different category).

Features:

Vast storage with integrated saddlebags and Tour-Pak, premium fairing with fairing lowers, advanced infotainment system (for its era), comfortable rider and passenger seating, cruise control, powerful V-twin engine, and iconic Harley-Davidson styling.

📋 Manual Details

Engine Coverage:

Complete engine assembly, disassembly, inspection, repair, and tuning for the Twin Cam 88B engine.

Transmission Coverage:

Disassembly, assembly, inspection, repair, and adjustment of the 5-speed Cruise Drive transmission.

Electrical Coverage:

Comprehensive wiring diagrams, component testing, troubleshooting for lighting, ignition, charging, and accessory systems.

Chassis Coverage:

Frame, suspension (front forks and rear shocks), wheels, tires, brakes, steering, and bodywork components.

Fuel System Coverage:

Fuel tank, fuel pump, fuel injectors, EFI system diagnosis and repair.

Braking System Coverage:

Brake caliper overhaul, master cylinder service, bleeding procedures, and ABS system troubleshooting.

Bodywork Coverage:

Fairing removal/installation, fairing components, luggage systems (tour-pak, saddlebags), seat, and fuel tank.

Diagnostic Coverage:

Troubleshooting charts, diagnostic trouble codes (DTCs) and their meanings, repair procedures based on symptoms.

Maintenance Coverage:

Scheduled maintenance intervals, fluid changes, filter replacements, lubrication points.

Estimated Pages:

Over 1000 pages (typical for a comprehensive factory service manual).

Type:

Workshop Service Repair Manual (Factory Official)

Language:

English

Format:

Digital Download (PDF)

📖 Manual Coverage

Engine:

Twin Cam 88B, including cylinder heads, pistons, crankshaft, oil pump, timing system, and EFI.

Transmission:

Cruise Drive 5-speed, clutch, primary drive, and gear lubrication.

Fuel System:

Electronic Sequential Port Fuel Injection (ESPFI), throttle body, injectors, fuel pump, pressure regulator.

Ignition System:

Ignition module, spark plugs, ignition coils, crank position sensor.

Charging System:

Stator, regulator/rectifier, battery maintenance and testing.

Exhaust System:

Mufflers, head pipes, catalytic converters (if applicable).

Suspension:

Front forks (telescopic, cartridge type), rear shock absorbers, linkage (if applicable).

Brakes:

Front and rear disc brakes, hydraulic system, caliper service, master cylinder, ABS (Anti-lock Braking System).

Wheels Tires:

Wheel bearing service, tire mounting and balancing, specifications.

Steering:

Handlebars, steering head bearings, fork assembly.

Lighting:

Headlight, taillight, turn signals, auxiliary lighting, dashboard illumination.

Accessories:

Fairing mounted audio system, cruise control, rider information display, CB radio, intercom.

Frame Body:

Frame inspection, body panel removal and installation, seat, fuel tank, fenders.

Diagnostics:

Diagnostic trouble codes (DTCs), troubleshooting procedures, data stream analysis (if applicable via scan tool).

Engine Rebuild:

Complete engine overhaul, piston and ring replacement, cylinder honing, valve seat grinding, crankshaft balancing.

Transmission Overhaul:

Complete transmission disassembly, gear inspection, bearing replacement, clutch pack service.

Brake Service:

Brake fluid flush and bleeding, caliper seal replacement, rotor inspection and replacement, ABS modulator service.

Suspension Service:

Fork oil change and seal replacement, rear shock absorber replacement, steering head bearing adjustment.

Electrical Troubleshooting:

Using wiring diagrams to diagnose circuits, testing sensors and actuators, starter and charging system checks.

Fuel Injection Tuning:

Basic EFI system checks, sensor testing, idle speed adjustment.

Tire Wheel Service:

Wheel bearing replacement, tire mounting and balancing, spoke tension adjustment (if applicable).

Bodywork Repair:

Fairing component replacement, fairing mounting and alignment, saddlebag and tour-pak adjustment.

Maintenance Tasks:

Oil and filter changes, primary chain tension adjustment, spark plug replacement, air filter service.

Diagnostic Code Lookup:

Interpretation of diagnostic trouble codes (DTCs) for targeted repair.

Depth:

Comprehensive, covering everything from routine maintenance to complete engine and transmission rebuilds, including detailed electrical system diagnostics.

📊 Manual Specifications

Format:

PDF

Searchability:

Searchable text for quick information retrieval.

Printability:

Printable pages for on-the-job reference.

Resolution:

High resolution for clear diagrams and illustrations.

Binding:

N/A (Digital Download)

Paper Type:

N/A (Digital Download)

⚙️ 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:

8.9:1

Horsepower:

Approx. 70-75 HP (at crankshaft, estimated)

Torque:

Approx. 85-90 lb-ft @ 3500 RPM (at crankshaft, estimated)

Fuel Delivery:

Electronic Sequential Port Fuel Injection (ESPFI)

Fuel Type:

Unleaded gasoline, minimum 91 octane (Octane rating can vary based on region and specific Harley-Davidson recommendations).

🔧 Transmission

Type:

Cruise Drive 5-speed constant mesh

Primary Drive:

Duplex chain

Final Drive:

Belt drive

Clutch:

Hydraulic, multi-plate wet clutch

Gear Ratios:

1st: 9.845, 2nd: 6.650, 3rd: 4.730, 4th: 3.760, 5th: 3.150 (Typical ratios for this model, consult manual for exact figures).

📐 Dimensions

Length:

Approx. 103.3 in (2624 mm)

Width:

Approx. 37.2 in (945 mm) (Handlebar width)

Height:

Approx. 56.5 in (1435 mm) (Overall)

Wheelbase:

Approx. 63.5 in (1613 mm)

Dry Weight:

Approx. 750 lbs (340 kg)

Gross Vehicle Weight Rating (Gvw R):

Approx. 1300 lbs (589.7 kg)

Saddlebag Capacity:

Integrated, lockable

Tour Pak Capacity:

Integrated, lockable, with passenger backrest

🛡️ Safety Features

Crash Test Ratings:

N/A (Motorcycles are not typically subjected to the same crash testing protocols as automobiles).

Braking:

Dual front disc brakes, single rear disc brake, linked braking system (optional), Anti-lock Braking System (ABS) on this FLHTCUI model.

Lighting:

Halogen headlight, integrated turn signals, brake light.

Ride Comfort:

Large fairing with windshield for wind protection, comfortable seating position for rider and passenger.

Stability:

Long wheelbase and stable chassis design for highway cruising.

💡 Technology Features

System:

Harley-Davidson Advanced Audio System with CB/intercom and tour-pak speakers. Often features AM/FM radio, cassette player (on some models of this era), and provisions for optional CD changer.

Display:

Analog gauges for speedometer and tachometer, LCD display for odometer, trip meters, fuel level, gear indication, and system status.

Cruise Control:

Standard electronic cruise control for highway comfort.

ABS:

Anti-lock Braking System (ABS) is standard on the FLHTCUI model for enhanced braking control.

Connectivity Features:

CB radio and intercom system for rider-passenger and external communication.

🔧 Maintenance

Oil Change Interval:

Every 5,000 miles or 6 months (whichever comes first). Consult manual for specific oil type and capacity.

Primary Chain Tension Adjustment:

Every 10,000 miles or 12 months.

Spark Plug Replacement:

Every 10,000 miles.

Brake Fluid Flush:

Every 2 years, regardless of mileage.

Drive Belt Inspection:

Inspect at every service, adjust tension as needed.

Engine Oil:

Harley-Davidson Genuine V-Twin Synthetic SAE 20W-50 or approved equivalent (e.g., Mobil 1 V-Twin 20W-50, Valvoline VR1 20W-50). Capacity: Approx. 4 quarts (3.8 liters) with filter change. Consult manual for exact specification.

Transmission Oil:

Harley-Davidson Formula +, SAE 85W-140 Gear Oil, or approved equivalent. Capacity: Approx. 1 quart (0.95 liters).

Primary Chain Case Oil:

Harley-Davidson Formula + or approved equivalent. Capacity: Approx. 1 quart (0.95 liters).

Brake Fluid:

DOT 4 (for ABS and non-ABS systems).

Fork Oil:

Typically SAE 15W. Capacity: 12.5 fl oz (370 ml) per fork leg (Consult manual for exact type and quantity).

Common Issues:

Cracked exhaust headers (especially at the collector), cam chain tensioner wear (on earlier Twin Cam models, though 2006 is a later evolution), oil leaks (common on older bikes, particularly around the primary and transmission), voltage regulator failure, starter solenoid issues, and some electrical gremlins in the infotainment system.

📚 Vehicle History

Heritage:

Harley-Davidson, founded in 1903, is an iconic American motorcycle manufacturer renowned for its V-twin engines, distinctive styling, and rider community.

Evolution:

The Electra Glide series has been a cornerstone of Harley-Davidson's touring lineup since the 1960s. The Softail chassis, introduced in 1984, mimicked the look of a hardtail frame while incorporating hidden rear suspension. The Ultra Classic designation represents the most fully-equipped touring model, with features like the fairing, saddlebags, and Tour-Pak.

Production Location:

York, Pennsylvania, USA

Production Years For This Configuration:

The Twin Cam 88B engine was used in this configuration during the 2006 model year. Subsequent years saw upgrades to the Twin Cam 96 and Milwaukee-Eight engines.

🏆 Awards & Recognition

Awards:

While specific awards for the 2006 FLHTCUI might not be widely publicized like automotive awards, it consistently received praise in motorcycle publications of the era for its comfort, touring capability, and V-twin performance. It was considered a benchmark in the luxury touring segment.