Segment:
Full-size touring motorcycles, representing Harley-Davidson's premium segment for long-distance comfort and style.
Competitors 2006:
Primarily other American V-twin touring bikes (e.g., Indian Chief Vintage), and high-end Japanese touring models (e.g., Honda Gold Wing, Yamaha Royal Star Venture).
Touring Platform:
Designed for comfort, cargo capacity, and highway cruising, often featuring fairings, saddlebags, and passenger amenities.
Diagnostic Focus:
Emphasis on troubleshooting EFI systems, Twin Cam engine specifics, and the integrated electrical systems common to these touring models.
Audience:
Harley-Davidson owners performing their own maintenance and repairs, independent motorcycle repair shops, and enthusiast restoration projects.
Powertrain:
Engine, Transmission, Clutch, Final Drive
Chassis And Suspension:
Frame, Swingarm, Forks, Shocks, Wheels, Tires, Steering
Brakes:
Hydraulic Brake System (Front and Rear), ABS (if equipped)
Electrical System:
Ignition, Charging System, Lighting, Instrumentation, Starting System, Battery, EFI (Electronic Fuel Injection)
Body And Trim:
Fairings, Saddlebags, Fenders, Seat, Handlebars, Controls
Diagnostics:
Troubleshooting charts, DTC (Diagnostic Trouble Code) interpretation
Routine Maintenance:
Oil changes, filter replacement, lubrication, chain adjustment (if applicable, though most FL models are belt drive)
Component Disassembly And Reassembly:
Engine top-end and bottom-end, transmission rebuild, fork overhaul, brake caliper service
Wiring Diagrams:
Detailed electrical schematics for all systems
Troubleshooting And Diagnosis:
Step-by-step guides for identifying and resolving common and complex issues
Special Tool Requirements:
Identification and usage of specialized tools for specific procedures
Depth:
Comprehensive: Covers from basic maintenance to full engine and transmission rebuilds, including electrical diagnostics and troubleshooting.
Engine Family:
Harley-Davidson Twin Cam 88
Engine Configuration:
45-degree V-twin, air-cooled
Displacement:
1450cc (88 cubic inches)
Bore X Stroke:
3.75 in x 3.968 in (95.25 mm x 100.6 mm)
Compression Ratio:
8.9:1 (typical for Twin Cam 88)
Valvetrain:
Overhead valves (OHV), 2 valves per cylinder (pushrod actuated)
Horsepower Est:
Approx. 70-75 HP (at crankshaft, may vary slightly by model/tuning)
Torque Est:
Approx. 86-90 lb-ft (at crankshaft, at ~3000-3500 RPM)
Fuel Delivery:
Electronic Fuel Injection (EFI) – Sequential Port Injection (SPI)
Fuel Type:
Unleaded gasoline, minimum 91 octane (95 RON)
Oil Type:
Harley-Davidson 20W-50 SYN3 or equivalent V-twin specific synthetic motorcycle oil.
Oil Capacity:
3.5 US quarts (3.3 liters) with filter change
System:
Electronic Ignition, single spark per cylinder.
Type:
5-speed constant mesh
Primary Drive:
Enclosed primary chain drive, wet clutch
Final Drive:
Belt drive (70-tooth rear pulley, 32-tooth front pulley typical)
Transmission Fluid:
Harley-Davidson Formula+ (or equivalent SAE 50 motorcycle transmission oil)
Transmission Oil Capacity:
24 US fluid ounces (0.71 liters)
Clutch Type:
Multi-plate, wet
Wheelbase Est:
63.5 - 64.5 inches (1613 - 1638 mm) depending on model
Seat Height Est:
27.0 - 28.0 inches (686 - 711 mm) depending on model and suspension setup
Dry Weight Est:
700 - 750 lbs (318 - 340 kg) depending on model
Gross Vehicle Weight Rating Est:
1150 - 1200 lbs (522 - 544 kg)
Saddlebag Capacity Est:
Approx. 2.2 cu ft combined (for FLHX, FLHT, FLTR models)
Crash Test Ratings:
Motorcycles are not subjected to standardized crash testing in the same manner as automobiles. Safety relies on rider skill and adherence to safe practices.
Braking System:
Dual-disc front brakes, single-disc rear brake. ABS available on some models.
Lighting:
Halogen headlight, LED taillight, turn signals. Passing lamps often standard on touring models.
Frame Construction:
Sturdy steel frame designed for stability at speed.
Ergonomics:
Designed for rider comfort over long distances, reducing fatigue.
Audio System:
Factory-installed AM/FM/WB stereo radio with cassette or CD player (depending on specific model/options), handlebar-mounted controls, speaker system integrated into fairing.
Cruise Control:
Standard on most FLHT and FLHR models, optional or standard on FLHX/FLTR depending on package.
ABS:
Anti-lock Braking System (ABS) was an optional feature available on these models for 2006.
Diagnostic Ports:
Access to diagnostic data via interfaces often used with Harley-Davidson specific diagnostic tools (e.g., Digi-Tach).
Dashboard:
Analog gauges for speedometer and tachometer, with smaller gauges for fuel level, oil pressure, voltage, and indicator lights.
First Service:
1,000 miles (1,600 km) or 6 months (whichever comes first)
Subsequent Service:
Every 5,000 miles (8,000 km) or 12 months, with more comprehensive checks at 10,000, 20,000 miles etc.
Primary Chain Case Oil:
Harley-Davidson Formula+ or SAE 50 motorcycle oil
Engine Oil:
Harley-Davidson 20W-50 SYN3 or equivalent V-twin synthetic motorcycle oil.
Brake Fluid:
DOT 4 (for hydraulic clutch and brake systems)
Fork Oil:
Typically SAE 15W (refer to manual for exact type and quantity per fork leg)
Common Wear Items:
Clutch plates, brake pads, tires, wheel bearings, fork seals.
Twin Cam Specifics:
Potential for oil pressure issues if not properly maintained, cam chain tensioner wear (upgrade kits available), sometimes rocker box leaks.
Oil Filter:
Harley-Davidson Part No. 63796-77A (or equivalent aftermarket)
Air Filter:
Harley-Davidson Part No. 29000004 (or equivalent aftermarket for stock AC)
Legacy:
Harley-Davidson, founded in 1903, is synonymous with American motorcycle culture, known for its V-twin engines and touring capabilities.
Touring Lineage:
The FL prefix has long represented Harley-Davidson's large touring motorcycles. The 2006 models are part of the evolution leading to the modern touring platform, featuring the Twin Cam engine and fuel injection.
Twin Cam Introduction:
The Twin Cam 88 was introduced in 1999, replacing the Evolution engine, and became the standard for Harley-Davidson's Big Twin lineup.
Manufacturing Location:
York, Pennsylvania, USA, and Milwaukee, Wisconsin, USA.
